chore: bump version to 1.0.6+28082025

canada health values

WEBDAV_SYNC_IMPLEMENTATION.md

@@ -1,287 +0,0 @@
-# WebDAV Cloud Sync Implementation
-
-## Overview
-
-This document describes the WebDAV cloud sync implementation for the Supplements Tracker Flutter app. The implementation allows users to synchronize their supplement data across multiple devices using WebDAV-compatible servers like Nextcloud, ownCloud, or any standard WebDAV server.
-
-## Architecture
-
-### Core Components
-
-#### 1. Data Models Enhanced with Sync Metadata
-
-All core data models (`Supplement`, `SupplementIntake`, `Ingredient`) have been enhanced with sync metadata:
-
-- `syncId: String` - Unique identifier for sync operations (UUID)
-- `lastModified: DateTime` - Timestamp of last modification
-- `syncStatus: SyncStatus` - Current sync state (pending, synced, modified, conflict, etc.)
-- `isDeleted: bool` - Soft delete flag for sync purposes
-
-#### 2. Sync Enumerations (`lib/models/sync_enums.dart`)
-
-- `SyncStatus` - Track individual record sync states
-- `SyncOperationStatus` - Overall sync operation states
-- `ConflictResolutionStrategy` - How to handle conflicts
-- `SyncFrequency` - Auto-sync timing options
-- `ConflictType` - Types of sync conflicts
-
-#### 3. Sync Data Models (`lib/models/sync_data.dart`)
-
-- `SyncData` - Complete data structure for WebDAV JSON format
-- `SyncConflict` - Represents conflicts between local and remote data
-- `SyncResult` - Results and statistics from sync operations
-- `SyncStatistics` - Detailed sync operation metrics
-
-#### 4. WebDAV Sync Service (`lib/services/webdav_sync_service.dart`)
-
-Core service handling WebDAV communication:
-- Server configuration and authentication
-- Data upload/download operations
-- Conflict detection and basic resolution
-- Network connectivity checking
-- Device identification
-
-#### 5. Sync Provider (`lib/providers/sync_provider.dart`)
-
-State management layer for sync operations:
-- Manages sync status and progress
-- Handles user configuration
-- Coordinates between WebDAV service and UI
-- Manages conflict resolution workflow
-
-#### 6. UI Components
-
-- `SyncSettingsScreen` - Complete WebDAV configuration interface
-- Integration with existing settings screen
-- Real-time sync status indicators
-- Conflict resolution dialogs
-
-### Database Schema Changes
-
-The database has been upgraded to version 6 with sync support:
-
-```sql
--- New sync columns added to existing tables
-ALTER TABLE supplements ADD COLUMN syncId TEXT NOT NULL UNIQUE;
-ALTER TABLE supplements ADD COLUMN lastModified TEXT NOT NULL;
-ALTER TABLE supplements ADD COLUMN syncStatus TEXT NOT NULL DEFAULT 'pending';
-ALTER TABLE supplements ADD COLUMN isDeleted INTEGER NOT NULL DEFAULT 0;
-
--- Similar columns added to supplement_intakes table
-
--- New sync metadata table
-CREATE TABLE sync_metadata (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
-  key TEXT NOT NULL UNIQUE,
-  value TEXT NOT NULL,
-  lastUpdated TEXT NOT NULL
-);
-
--- Device info table for multi-device conflict resolution
-CREATE TABLE device_info (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
-  deviceId TEXT NOT NULL UNIQUE,
-  deviceName TEXT NOT NULL,
-  lastSyncTime TEXT,
-  createdAt TEXT NOT NULL
-);
-```
-
-## Sync Process Flow
-
-### 1. Configuration Phase
-1. User enters WebDAV server URL, username, and password/app password
-2. System tests connection and validates credentials
-3. Creates sync directory on server if needed
-4. Stores encrypted credentials locally using `flutter_secure_storage`
-
-### 2. Sync Operation
-1. Check network connectivity
-2. Download remote sync data (JSON file from WebDAV)
-3. Compare with local data using timestamps and sync IDs
-4. Detect conflicts (modification, deletion, creation conflicts)
-5. Merge data according to conflict resolution strategy
-6. Upload merged data back to server
-7. Update local sync status
-
-### 3. Conflict Resolution
-- **Last-write-wins**: Prefer most recently modified record
-- **Prefer Local**: Always keep local changes
-- **Prefer Remote**: Always keep remote changes
-- **Manual**: Present conflicts to user for individual resolution
-
-## Security Considerations
-
-### Data Protection
-- Credentials stored using `flutter_secure_storage` with platform encryption
-- Support for app passwords instead of main account passwords
-- No sensitive data logged in release builds
-
-### Network Security
-- HTTPS enforced for WebDAV connections
-- Connection testing before storing credentials
-- Proper error handling for authentication failures
-
-## Supported WebDAV Servers
-
-### Tested Compatibility
-- **Nextcloud** - Full compatibility with automatic path detection
-- **ownCloud** - Full compatibility with automatic path detection
-- **Generic WebDAV** - Manual path configuration required
-
-### Server Requirements
-- WebDAV protocol support
-- File read/write permissions
-- Directory creation permissions
-- Basic or digest authentication
-
-## Data Synchronization Format
-
-### JSON Structure
-```json
-{
-  "version": 1,
-  "deviceId": "device_12345_67890",
-  "deviceName": "John's Phone",
-  "syncTimestamp": "2024-01-15T10:30:00.000Z",
-  "supplements": [
-    {
-      "syncId": "uuid-supplement-1",
-      "name": "Vitamin D3",
-      "ingredients": [...],
-      "lastModified": "2024-01-15T09:15:00.000Z",
-      "syncStatus": "synced",
-      "isDeleted": false,
-      // ... other supplement fields
-    }
-  ],
-  "intakes": [
-    {
-      "syncId": "uuid-intake-1",
-      "supplementId": 1,
-      "takenAt": "2024-01-15T08:00:00.000Z",
-      "lastModified": "2024-01-15T08:00:30.000Z",
-      "syncStatus": "synced",
-      "isDeleted": false,
-      // ... other intake fields
-    }
-  ],
-  "metadata": {
-    "totalSupplements": 5,
-    "totalIntakes": 150
-  }
-}
-```
-
-## Usage Instructions
-
-### Initial Setup
-1. Navigate to Settings → Cloud Sync
-2. Enter your WebDAV server details:
-   - Server URL (e.g., `https://cloud.example.com`)
-   - Username
-   - Password or app password
-   - Optional device name
-3. Test connection
-4. Configure sync preferences
-
-### Sync Options
-- **Manual Sync**: Sync on demand via button press
-- **Auto Sync**: Automatic background sync at configured intervals
-  - Every 15 minutes
-  - Hourly
-  - Every 6 hours
-  - Daily
-
-### Conflict Resolution
-- Configure preferred resolution strategy in settings
-- Review individual conflicts when they occur
-- Auto-resolve based on chosen strategy
-
-## Implementation Status
-
-### ✅ Completed (Phase 1)
-- Core sync architecture and data models
-- WebDAV service implementation
-- Database schema with sync support
-- Basic UI for configuration and management
-- Manual sync operations
-- Conflict detection
-- Secure credential storage
-
-### 🔄 Future Enhancements (Phase 2+)
-- Background sync scheduling
-- Advanced conflict resolution UI
-- Sync history and logs
-- Client-side encryption option
-- Multiple server support
-- Bandwidth optimization
-- Offline queue management
-
-## Dependencies Added
-
-```yaml
-dependencies:
-  webdav_client: ^1.2.2      # WebDAV protocol client
-  connectivity_plus: ^6.0.5   # Network connectivity checking
-  flutter_secure_storage: ^9.2.2  # Secure credential storage
-  uuid: ^4.5.0               # UUID generation for sync IDs
-  crypto: ^3.0.5             # Data integrity verification
-```
-
-## File Structure
-
-```
-lib/
-├── models/
-│   ├── sync_enums.dart           # Sync-related enumerations
-│   ├── sync_data.dart            # Sync data models
-│   ├── supplement.dart           # Enhanced with sync metadata
-│   ├── supplement_intake.dart    # Enhanced with sync metadata
-│   └── ingredient.dart           # Enhanced with sync metadata
-├── services/
-│   ├── webdav_sync_service.dart  # WebDAV communication
-│   └── database_helper.dart      # Enhanced with sync methods
-├── providers/
-│   └── sync_provider.dart        # Sync state management
-└── screens/
-    └── sync_settings_screen.dart # Sync configuration UI
-```
-
-## Error Handling
-
-The implementation includes comprehensive error handling for:
-- Network connectivity issues
-- Authentication failures
-- Server unavailability
-- Malformed sync data
-- Storage permission issues
-- Conflicting concurrent modifications
-
-## Testing Recommendations
-
-### Unit Tests
-- Sync data serialization/deserialization
-- Conflict detection algorithms
-- Merge logic validation
-
-### Integration Tests
-- WebDAV server communication
-- Database sync operations
-- Cross-device sync scenarios
-
-### User Testing
-- Multi-device sync workflows
-- Network interruption recovery
-- Large dataset synchronization
-- Conflict resolution user experience
-
-## Performance Considerations
-
-- Incremental sync (only changed data)
-- Compression for large datasets
-- Connection timeout handling
-- Memory-efficient JSON processing
-- Background processing for large operations
-
-This implementation provides a solid foundation for cloud synchronization while maintaining data integrity and user experience across multiple devices.

assets/canada_health.json

@@ -0,0 +1,896 @@
+{
+  "source": "Health Canada Dietary Reference Intakes (vitamins & elements)",
+  "note": "Values come from Health Canada DRI tables. rda_type denotes whether the value is an RDA or an AI as published.",
+  "nutrients": {
+    "vitamin_a": {
+      "unit": "µg/day (RAE)",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 400, "ul": 600 },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 500, "ul": 600 },
+        { "age_range": "1-3 y", "sex": "both", "value": 300, "ul": 600 },
+        { "age_range": "4-8 y", "sex": "both", "value": 400, "ul": 900 },
+        { "age_range": "9-13 y", "sex": "male", "value": 600, "ul": 1700 },
+        { "age_range": "9-13 y", "sex": "female", "value": 600, "ul": 1700 },
+        { "age_range": "14-18 y", "sex": "male", "value": 900, "ul": 2800 },
+        { "age_range": "14-18 y", "sex": "female", "value": 700, "ul": 2800 },
+        { "age_range": "19-30 y", "sex": "male", "value": 900, "ul": 3000 },
+        { "age_range": "19-30 y", "sex": "female", "value": 700, "ul": 3000 },
+        { "age_range": "31-50 y", "sex": "male", "value": 900, "ul": 3000 },
+        { "age_range": "31-50 y", "sex": "female", "value": 700, "ul": 3000 },
+        { "age_range": "51-70 y", "sex": "male", "value": 900, "ul": 3000 },
+        { "age_range": "51-70 y", "sex": "female", "value": 700, "ul": 3000 },
+        { "age_range": ">70 y", "sex": "male", "value": 900, "ul": 3000 },
+        { "age_range": ">70 y", "sex": "female", "value": 700, "ul": 3000 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 750,
+          "ul": 2800
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 770,
+          "ul": 3000
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 1200,
+          "ul": 2800
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 1300,
+          "ul": 3000
+        }
+      ]
+    },
+    "vitamin_c": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 40, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 50, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 15, "ul": 400 },
+        { "age_range": "4-8 y", "sex": "both", "value": 25, "ul": 650 },
+        { "age_range": "9-13 y", "sex": "male", "value": 45, "ul": 1200 },
+        { "age_range": "9-13 y", "sex": "female", "value": 45, "ul": 1200 },
+        { "age_range": "14-18 y", "sex": "male", "value": 75, "ul": 1800 },
+        { "age_range": "14-18 y", "sex": "female", "value": 65, "ul": 1800 },
+        { "age_range": "19-30 y", "sex": "male", "value": 75, "ul": 1800 },
+        { "age_range": "19-30 y", "sex": "female", "value": 90, "ul": 2000 },
+        { "age_range": "31-50 y", "sex": "male", "value": 75, "ul": 2000 },
+        { "age_range": "31-50 y", "sex": "female", "value": 75, "ul": 2000 },
+        { "age_range": "51-70 y", "sex": "both", "value": 75, "ul": 2000 },
+        { "age_range": ">70 y", "sex": "both", "value": 75, "ul": 2000 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 80,
+          "ul": 1800
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 85,
+          "ul": 2000
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 115,
+          "ul": 1800
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 120,
+          "ul": 2000
+        }
+      ]
+    },
+    "vitamin_d": {
+      "unit": "µg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 10, "ul": 25 },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 15, "ul": 25 },
+        { "age_range": "1-3 y", "sex": "both", "value": 15, "ul": 50 },
+        { "age_range": "4-8 y", "sex": "both", "value": 15, "ul": 50 },
+        { "age_range": "9-13 y", "sex": "both", "value": 15, "ul": 100 },
+        { "age_range": "14-18 y", "sex": "both", "value": 15, "ul": 100 },
+        { "age_range": "19-30 y", "sex": "both", "value": 15, "ul": 100 },
+        { "age_range": "31-50 y", "sex": "both", "value": 15, "ul": 100 },
+        { "age_range": "51-70 y", "sex": "both", "value": 20, "ul": 100 },
+        { "age_range": ">70 y", "sex": "both", "value": 20, "ul": 100 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 15,
+          "ul": 100
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 15,
+          "ul": 100
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 15,
+          "ul": 100
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 15,
+          "ul": 100
+        }
+      ]
+    },
+    "vitamin_e": {
+      "unit": "mg/day (alpha-tocopherol)",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 4, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 5, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 6, "ul": 200 },
+        { "age_range": "4-8 y", "sex": "both", "value": 7, "ul": 300 },
+        { "age_range": "9-13 y", "sex": "both", "value": 11, "ul": 600 },
+        { "age_range": "14-18 y", "sex": "both", "value": 15, "ul": 800 },
+        { "age_range": "19-30 y", "sex": "both", "value": 15, "ul": 800 },
+        { "age_range": "31-50 y", "sex": "both", "value": 15, "ul": 800 },
+        { "age_range": "51-70 y", "sex": "both", "value": 15, "ul": 800 },
+        { "age_range": ">70 y", "sex": "both", "value": 15, "ul": 800 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 19,
+          "ul": 800
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 19,
+          "ul": 800
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 19,
+          "ul": 800
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 19,
+          "ul": 800
+        }
+      ]
+    },
+    "vitamin_k": {
+      "unit": "µg/day",
+      "rda_type": "AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 2, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 2.5, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 30, "ul": null },
+        { "age_range": "4-8 y", "sex": "both", "value": 55, "ul": null },
+        { "age_range": "9-13 y", "sex": "both", "value": 60, "ul": null },
+        { "age_range": "14-18 y", "sex": "male", "value": 75, "ul": null },
+        { "age_range": "14-18 y", "sex": "female", "value": 75, "ul": null },
+        { "age_range": "19-30 y", "sex": "male", "value": 75, "ul": null },
+        { "age_range": "19-30 y", "sex": "female", "value": 75, "ul": null },
+        { "age_range": "31-50 y", "sex": "male", "value": 75, "ul": null },
+        { "age_range": "31-50 y", "sex": "female", "value": 75, "ul": null },
+        { "age_range": "51-70 y", "sex": "male", "value": 75, "ul": null },
+        { "age_range": "51-70 y", "sex": "female", "value": 75, "ul": null },
+        { "age_range": ">70 y", "sex": "male", "value": 75, "ul": null },
+        { "age_range": ">70 y", "sex": "female", "value": 75, "ul": null },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 75,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 75,
+          "ul": null
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 75,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 75,
+          "ul": null
+        }
+      ]
+    },
+    "vitamin_b1": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.2, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 0.3, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 0.5, "ul": null },
+        { "age_range": "4-8 y", "sex": "both", "value": 0.6, "ul": null },
+        { "age_range": "9-13 y", "sex": "male", "value": 0.9, "ul": null },
+        { "age_range": "9-13 y", "sex": "female", "value": 0.9, "ul": null },
+        { "age_range": "14-18 y", "sex": "male", "value": 1.2, "ul": null },
+        { "age_range": "14-18 y", "sex": "female", "value": 1.0, "ul": null },
+        { "age_range": "19-30 y", "sex": "male", "value": 1.2, "ul": null },
+        { "age_range": "19-30 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": "31-50 y", "sex": "male", "value": 1.2, "ul": null },
+        { "age_range": "31-50 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": "51-70 y", "sex": "male", "value": 1.2, "ul": null },
+        { "age_range": "51-70 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": ">70 y", "sex": "male", "value": 1.2, "ul": null },
+        { "age_range": ">70 y", "sex": "female", "value": 1.1, "ul": null },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 1.4,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 1.4,
+          "ul": null
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 1.5,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 1.5,
+          "ul": null
+        }
+      ]
+    },
+    "vitamin_b2": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.3, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 0.4, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 0.5, "ul": null },
+        { "age_range": "4-8 y", "sex": "both", "value": 0.6, "ul": null },
+        { "age_range": "9-13 y", "sex": "male", "value": 0.9, "ul": null },
+        { "age_range": "9-13 y", "sex": "female", "value": 0.9, "ul": null },
+        { "age_range": "14-18 y", "sex": "male", "value": 1.3, "ul": null },
+        { "age_range": "14-18 y", "sex": "female", "value": 1.0, "ul": null },
+        { "age_range": "19-30 y", "sex": "male", "value": 1.3, "ul": null },
+        { "age_range": "19-30 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": "31-50 y", "sex": "male", "value": 1.3, "ul": null },
+        { "age_range": "31-50 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": "51-70 y", "sex": "male", "value": 1.3, "ul": null },
+        { "age_range": "51-70 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": ">70 y", "sex": "male", "value": 1.3, "ul": null },
+        { "age_range": ">70 y", "sex": "female", "value": 1.1, "ul": null },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 1.4,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 1.4,
+          "ul": null
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 1.6,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 1.6,
+          "ul": null
+        }
+      ]
+    },
+    "vitamin_b3": {
+      "unit": "mg/day (niacin equivalents, NE)",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 2, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 4, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 6, "ul": 10 },
+        { "age_range": "4-8 y", "sex": "both", "value": 8, "ul": 15 },
+        { "age_range": "9-13 y", "sex": "both", "value": 12, "ul": 20 },
+        { "age_range": "14-18 y", "sex": "male", "value": 16, "ul": 30 },
+        { "age_range": "14-18 y", "sex": "female", "value": 14, "ul": 30 },
+        { "age_range": "19-30 y", "sex": "male", "value": 16, "ul": 35 },
+        { "age_range": "19-30 y", "sex": "female", "value": 14, "ul": 35 },
+        { "age_range": "31-50 y", "sex": "male", "value": 16, "ul": 35 },
+        { "age_range": "31-50 y", "sex": "female", "value": 14, "ul": 35 },
+        { "age_range": "51-70 y", "sex": "male", "value": 16, "ul": 35 },
+        { "age_range": "51-70 y", "sex": "female", "value": 14, "ul": 35 },
+        { "age_range": ">70 y", "sex": "male", "value": 16, "ul": 35 },
+        { "age_range": ">70 y", "sex": "female", "value": 14, "ul": 35 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 18,
+          "ul": 35
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 18,
+          "ul": 35
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 17,
+          "ul": 35
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 17,
+          "ul": 35
+        }
+      ]
+    },
+    "vitamin_b5": {
+      "unit": "mg/day",
+      "rda_type": "AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 1.7, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 1.8, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 2.0, "ul": null },
+        { "age_range": "4-8 y", "sex": "both", "value": 3.0, "ul": null },
+        { "age_range": "9-13 y", "sex": "both", "value": 4.0, "ul": null },
+        { "age_range": "14-18 y", "sex": "both", "value": 5.0, "ul": null },
+        { "age_range": "19-30 y", "sex": "both", "value": 5.0, "ul": null },
+        { "age_range": "31-50 y", "sex": "both", "value": 5.0, "ul": null },
+        { "age_range": "51-70 y", "sex": "both", "value": 5.0, "ul": null },
+        { "age_range": ">70 y", "sex": "both", "value": 5.0, "ul": null },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 6.0,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 6.0,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 31-50 y",
+          "sex": "female",
+          "value": 6.0,
+          "ul": null
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 7.0,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 7.0,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 31-50 y",
+          "sex": "female",
+          "value": 7.0,
+          "ul": null
+        }
+      ]
+    },
+    "vitamin_b6": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.1, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 0.3, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 0.5, "ul": 30 },
+        { "age_range": "4-8 y", "sex": "both", "value": 0.6, "ul": 40 },
+        { "age_range": "9-13 y", "sex": "both", "value": 1.0, "ul": 60 },
+        { "age_range": "14-18 y", "sex": "male", "value": 1.3, "ul": 80 },
+        { "age_range": "14-18 y", "sex": "female", "value": 1.2, "ul": 80 },
+        { "age_range": "19-50 y", "sex": "male", "value": 1.3, "ul": 100 },
+        { "age_range": "19-50 y", "sex": "female", "value": 1.3, "ul": 100 },
+        { "age_range": "51-70 y", "sex": "male", "value": 1.7, "ul": 100 },
+        { "age_range": "51-70 y", "sex": "female", "value": 1.5, "ul": 100 },
+        { "age_range": ">70 y", "sex": "male", "value": 1.7, "ul": 100 },
+        { "age_range": ">70 y", "sex": "female", "value": 1.5, "ul": 100 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 1.9,
+          "ul": 80
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 1.9,
+          "ul": 80
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 2.0,
+          "ul": 100
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 2.0,
+          "ul": 100
+        }
+      ]
+    },
+    "vitamin_b12": {
+      "unit": "µg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.4, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 0.5, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 0.9, "ul": null },
+        { "age_range": "4-8 y", "sex": "both", "value": 1.2, "ul": null },
+        { "age_range": "9-13 y", "sex": "both", "value": 1.8, "ul": null },
+        { "age_range": "14-18 y", "sex": "both", "value": 2.4, "ul": null },
+        { "age_range": "19-30 y", "sex": "both", "value": 2.4, "ul": null },
+        { "age_range": "31-50 y", "sex": "both", "value": 2.4, "ul": null },
+        { "age_range": "51-70 y", "sex": "both", "value": 2.4, "ul": null },
+        { "age_range": ">70 y", "sex": "both", "value": 2.4, "ul": null },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 2.6,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 2.6,
+          "ul": null
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 2.8,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 2.8,
+          "ul": null
+        }
+      ]
+    },
+    "iron": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.27, "ul": 40 },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 11, "ul": 40 },
+        { "age_range": "1-3 y", "sex": "both", "value": 7, "ul": 40 },
+        { "age_range": "4-8 y", "sex": "both", "value": 10, "ul": 40 },
+        { "age_range": "9-13 y", "sex": "male", "value": 8, "ul": 45 },
+        { "age_range": "9-13 y", "sex": "female", "value": 8, "ul": 45 },
+        { "age_range": "14-18 y", "sex": "male", "value": 11, "ul": 45 },
+        { "age_range": "14-18 y", "sex": "female", "value": 15, "ul": 45 },
+        { "age_range": "19-30 y", "sex": "male", "value": 8, "ul": 45 },
+        { "age_range": "19-30 y", "sex": "female", "value": 18, "ul": 45 },
+        { "age_range": "31-50 y", "sex": "male", "value": 8, "ul": 45 },
+        { "age_range": "31-50 y", "sex": "female", "value": 18, "ul": 45 },
+        { "age_range": "51-70 y", "sex": "male", "value": 8, "ul": 45 },
+        { "age_range": "51-70 y", "sex": "female", "value": 8, "ul": 45 },
+        { "age_range": ">70 y", "sex": "male", "value": 8, "ul": 45 },
+        { "age_range": ">70 y", "sex": "female", "value": 8, "ul": 45 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 27,
+          "ul": 45
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 27,
+          "ul": 45
+        },
+        {
+          "age_range": "pregnancy 31-50 y",
+          "sex": "female",
+          "value": 27,
+          "ul": 45
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 10,
+          "ul": 45
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 9,
+          "ul": 45
+        },
+        {
+          "age_range": "lactation 31-50 y",
+          "sex": "female",
+          "value": 9,
+          "ul": 45
+        }
+      ]
+    },
+    "magnesium": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "note": "UL represents intake from pharmacological agents only, not food or water.",
+      "life_stages": [
+        {
+          "age_range": "0-6 mo",
+          "sex": "infant",
+          "value": 30,
+          "rda_type": "AI",
+          "ul": 40
+        },
+        {
+          "age_range": "7-12 mo",
+          "sex": "infant",
+          "value": 75,
+          "rda_type": "AI",
+          "ul": 40
+        },
+        {
+          "age_range": "1-3 y",
+          "sex": "both",
+          "value": 80,
+          "rda_type": "RDA",
+          "ul": 65
+        },
+        {
+          "age_range": "4-8 y",
+          "sex": "both",
+          "value": 130,
+          "rda_type": "RDA",
+          "ul": 110
+        },
+        {
+          "age_range": "9-13 y",
+          "sex": "male",
+          "value": 240,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "9-13 y",
+          "sex": "female",
+          "value": 240,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "14-18 y",
+          "sex": "male",
+          "value": 410,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "14-18 y",
+          "sex": "female",
+          "value": 360,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "19-30 y",
+          "sex": "male",
+          "value": 400,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "19-30 y",
+          "sex": "female",
+          "value": 310,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "31-50 y",
+          "sex": "male",
+          "value": 420,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "31-50 y",
+          "sex": "female",
+          "value": 320,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "51-70 y",
+          "sex": "male",
+          "value": 420,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "51-70 y",
+          "sex": "female",
+          "value": 320,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": ">70 y",
+          "sex": "male",
+          "value": 420,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": ">70 y",
+          "sex": "female",
+          "value": 320,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 400,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 350,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "pregnancy 31-50 y",
+          "sex": "female",
+          "value": 360,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 360,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 320,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "lactation 31-50 y",
+          "sex": "female",
+          "value": 320,
+          "rda_type": "RDA",
+          "ul": 350
+        }
+      ]
+    },
+    "zinc": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 2, "ul": 4 },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 3, "ul": 5 },
+        { "age_range": "1-3 y", "sex": "both", "value": 3, "ul": 7 },
+        { "age_range": "4-8 y", "sex": "both", "value": 5, "ul": 12 },
+        { "age_range": "9-13 y", "sex": "male", "value": 8, "ul": 23 },
+        { "age_range": "9-13 y", "sex": "female", "value": 8, "ul": 23 },
+        { "age_range": "14-18 y", "sex": "male", "value": 11, "ul": 34 },
+        { "age_range": "14-18 y", "sex": "female", "value": 9, "ul": 34 },
+        { "age_range": "19-30 y", "sex": "male", "value": 11, "ul": 40 },
+        { "age_range": "19-30 y", "sex": "female", "value": 8, "ul": 40 },
+        { "age_range": "31-50 y", "sex": "male", "value": 11, "ul": 40 },
+        { "age_range": "31-50 y", "sex": "female", "value": 8, "ul": 40 },
+        { "age_range": "51-70 y", "sex": "male", "value": 11, "ul": 40 },
+        { "age_range": "51-70 y", "sex": "female", "value": 8, "ul": 40 },
+        { "age_range": ">70 y", "sex": "male", "value": 11, "ul": 40 },
+        { "age_range": ">70 y", "sex": "female", "value": 8, "ul": 40 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 12,
+          "ul": 40
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 11,
+          "ul": 40
+        },
+        {
+          "age_range": "pregnancy 31-50 y",
+          "sex": "female",
+          "value": 11,
+          "ul": 40
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 13,
+          "ul": 40
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 12,
+          "ul": 40
+        },
+        {
+          "age_range": "lactation 31-50 y",
+          "sex": "female",
+          "value": 12,
+          "ul": 40
+        }
+      ]
+    },
+    "creatine": {
+      "unit": "g/day",
+      "rda_type": "Recommended Dosage",
+      "note": "Creatine monohydrate supplementation typically involves a loading phase of 20-25 g/day divided into 4-5 g doses for 5-7 days, followed by a maintenance dose of 3-5 g/day. The UL is not a strict daily maximum but based on safe dosages studied for various durations.",
+      "life_stages": [
+        {
+          "age_range": "adult",
+          "sex": "both",
+          "value_min": 3,
+          "value_max": 5,
+          "description": "Maintenance dose (typical daily intake)"
+        },
+        {
+          "age_range": "adult",
+          "sex": "both",
+          "value": 20,
+          "description": "Loading phase daily dose (divided into 4-5 g servings for 5-7 days)"
+        }
+      ],
+      "ul": {
+        "value": 25,
+        "unit": "g/day",
+        "duration": "up to 14 days",
+        "note": "Doses up to 25 g/day for up to 14 days have been safely used. Long-term doses of 3-5 g/day are considered safe."
+      }
+    },
+    "manganese": {
+      "unit": "mg/day",
+      "rda_type": "AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.003, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 0.6, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 1.2, "ul": 2 },
+        { "age_range": "4-8 y", "sex": "both", "value": 1.5, "ul": 3 },
+        { "age_range": "9-13 y", "sex": "male", "value": 1.9, "ul": 6 },
+        { "age_range": "9-13 y", "sex": "female", "value": 1.6, "ul": 6 },
+        { "age_range": "14-18 y", "sex": "male", "value": 2.2, "ul": 9 },
+        { "age_range": "14-18 y", "sex": "female", "value": 1.6, "ul": 9 },
+        { "age_range": "19-30 y", "sex": "male", "value": 2.3, "ul": 11 },
+        { "age_range": "19-30 y", "sex": "female", "value": 1.8, "ul": 11 },
+        { "age_range": "31-50 y", "sex": "male", "value": 2.3, "ul": 11 },
+        { "age_range": "31-50 y", "sex": "female", "value": 1.8, "ul": 11 },
+        { "age_range": "51-70 y", "sex": "male", "value": 2.3, "ul": 11 },
+        { "age_range": "51-70 y", "sex": "female", "value": 1.8, "ul": 11 },
+        { "age_range": ">70 y", "sex": "male", "value": 2.3, "ul": 11 },
+        { "age_range": ">70 y", "sex": "female", "value": 1.8, "ul": 11 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 1.9,
+          "ul": 11
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 1.8,
+          "ul": 11
+        },
+        {
+          "age_range": "pregnancy 31-50 y",
+          "sex": "female",
+          "value": 1.8,
+          "ul": 11
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 2.6,
+          "ul": 11
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 2.3,
+          "ul": 11
+        },
+        {
+          "age_range": "lactation 31-50 y",
+          "sex": "female",
+          "value": 2.3,
+          "ul": 11
+        }
+      ]
+    },
+    "folate_dfe": {
+      "unit": "µg/day (DFE)",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 65, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 80, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 150, "ul": 300 },
+        { "age_range": "4-8 y", "sex": "both", "value": 200, "ul": 400 },
+        { "age_range": "9-13 y", "sex": "male", "value": 300, "ul": 600 },
+        { "age_range": "9-13 y", "sex": "female", "value": 300, "ul": 600 },
+        { "age_range": "14-18 y", "sex": "both", "value": 400, "ul": 800 },
+        { "age_range": "19-30 y", "sex": "female", "value": 400, "ul": 1000 },
+        { "age_range": "19-30 y", "sex": "male", "value": 400, "ul": 1000 },
+        { "age_range": "31-50 y", "sex": "both", "value": 400, "ul": 1000 },
+        { "age_range": "51-70 y", "sex": "both", "value": 400, "ul": 1000 },
+        { "age_range": ">70 y", "sex": "both", "value": 400, "ul": 1000 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 600,
+          "ul": 800
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 600,
+          "ul": 1000
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 500,
+          "ul": 800
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 500,
+          "ul": 1000
+        }
+      ]
+    }
+  }
+}

lib/data/rda_data.dart

@@ -0,0 +1,71 @@
+// Recommended Daily Allowances (RDA) for common vitamins and minerals.
+// All values are in milligrams (mg) unless otherwise specified.
+const Map<String, Map<String, Map<String, double>>> rdaData = {
+  'Vitamin C': {
+    'Male': {
+      '19-70': 90, // mg
+    },
+    'Female': {
+      '19-70': 75, // mg
+    },
+  },
+  'Vitamin D': {
+    'Male': {
+      '19-70': 15, // mcg
+    },
+    'Female': {
+      '19-70': 15, // mcg
+    },
+  },
+  'Vitamin D3': {
+    'Male': {
+      '19-70': 15, // mcg
+    },
+    'Female': {
+      '19-70': 15, // mcg
+    },
+  },
+  'Vitamin K': {
+    'Male': {
+      '19-100': 120, // mcg
+    },
+    'Female': {
+      '19-100': 90, // mcg
+    },
+  },
+  'Vitamin K2': {
+    'Male': {
+      '19-100': 120, // mcg
+    },
+    'Female': {
+      '19-100': 90, // mcg
+    },
+  },
+  'Calcium': {
+    'Male': {
+      '19-50': 1000, // mg
+      '51-70': 1000, // mg
+    },
+    'Female': {
+      '19-50': 1000, // mg
+      '51-70': 1200, // mg
+    },
+  },
+  'Iron': {
+    'Male': {
+      '19-50': 8, // mg
+    },
+    'Female': {
+      '19-50': 18, // mg
+      '51-70': 8, // mg
+    },
+  },
+  'DHA & EPA': {
+    'Male': {
+      '19-100': 250, // mg
+    },
+    'Female': {
+      '19-100': 250, // mg
+    },
+  },
+};

lib/main.dart

@@ -1,17 +1,25 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 import 'providers/settings_provider.dart';
+import 'providers/simple_sync_provider.dart';
 import 'providers/supplement_provider.dart';
-import 'providers/sync_provider.dart';
 import 'screens/home_screen.dart';
+import 'screens/profile_setup_screen.dart';
 
-void main() {
+void main() async {
-  runApp(const MyApp());
+  WidgetsFlutterBinding.ensureInitialized();
+  final settingsProvider = SettingsProvider();
+  await settingsProvider.initialize();
+
+  runApp(MyApp(settingsProvider: settingsProvider));
 }
 
 class MyApp extends StatelessWidget {
-  const MyApp({super.key});
+  final SettingsProvider settingsProvider;
+
+  const MyApp({super.key, required this.settingsProvider});
 
   @override
   Widget build(BuildContext context) {
@@ -20,17 +28,41 @@ class MyApp extends StatelessWidget {
         ChangeNotifierProvider(
           create: (context) => SupplementProvider()..initialize(),
         ),
-        ChangeNotifierProvider(
+        ChangeNotifierProvider.value(
-          create: (context) => SettingsProvider()..initialize(),
+          value: settingsProvider,
         ),
-        ChangeNotifierProxyProvider<SupplementProvider, SyncProvider>(
+        ChangeNotifierProvider(
-          create: (context) => SyncProvider(context.read<SupplementProvider>())..initialize(),
+          create: (context) => SimpleSyncProvider(),
-          update: (context, supplementProvider, syncProvider) =>
-            syncProvider ?? SyncProvider(supplementProvider)..initialize(),
         ),
       ],
-      child: Consumer<SettingsProvider>(
+      child: Consumer2<SettingsProvider, SimpleSyncProvider>(
-        builder: (context, settingsProvider, child) {
+        builder: (context, settingsProvider, syncProvider, child) {
+          // Set up the sync completion callback to refresh supplement data
+          // and initialize auto-sync integration
+          WidgetsBinding.instance.addPostFrameCallback((_) {
+            final supplementProvider = context.read<SupplementProvider>();
+
+            // Set up sync completion callback
+            syncProvider.setOnSyncCompleteCallback(() async {
+              if (kDebugMode) {
+                print('SupplementsLog: Sync completed, refreshing UI data...');
+              }
+              await supplementProvider.loadSupplements();
+              await supplementProvider.loadTodayIntakes();
+              if (kDebugMode) {
+                print('SupplementsLog: UI data refreshed after sync');
+              }
+            });
+
+            // Initialize auto-sync service
+            syncProvider.initializeAutoSync(settingsProvider);
+
+            // Set up auto-sync callback for data changes
+            supplementProvider.setOnDataChangedCallback(() {
+              syncProvider.triggerAutoSyncIfEnabled();
+            });
+          });
+
           return MaterialApp(
             title: 'Supplements Tracker',
             theme: ThemeData(
@@ -48,7 +80,9 @@ class MyApp extends StatelessWidget {
               useMaterial3: true,
             ),
             themeMode: settingsProvider.themeMode,
-            home: const HomeScreen(),
+            home: (settingsProvider.age == null || settingsProvider.gender == null)
+                ? const ProfileSetupScreen()
+                : const HomeScreen(),
             debugShowCheckedModeBanner: false,
           );
         },

lib/models/ingredient.dart

@@ -1,4 +1,4 @@
-import 'sync_enums.dart';
+import '../services/database_sync_service.dart';
 
 class Ingredient {
   final int? id;
@@ -9,7 +9,7 @@ class Ingredient {
   // Sync metadata
   final String syncId;
   final DateTime lastModified;
-  final SyncStatus syncStatus;
+  final RecordSyncStatus syncStatus;
   final bool isDeleted;
 
   const Ingredient({
@@ -19,7 +19,7 @@ class Ingredient {
     required this.unit,
     required this.syncId,
     required this.lastModified,
-    this.syncStatus = SyncStatus.pending,
+    this.syncStatus = RecordSyncStatus.pending,
     this.isDeleted = false,
   });
 
@@ -47,11 +47,11 @@ class Ingredient {
           ? DateTime.parse(map['lastModified'])
           : DateTime.now(),
       syncStatus: map['syncStatus'] != null
-          ? SyncStatus.values.firstWhere(
+          ? RecordSyncStatus.values.firstWhere(
               (e) => e.name == map['syncStatus'],
-              orElse: () => SyncStatus.pending,
+              orElse: () => RecordSyncStatus.pending,
             )
-          : SyncStatus.pending,
+          : RecordSyncStatus.pending,
       isDeleted: (map['isDeleted'] ?? 0) == 1,
     );
   }
@@ -63,7 +63,7 @@ class Ingredient {
     String? unit,
     String? syncId,
     DateTime? lastModified,
-    SyncStatus? syncStatus,
+    RecordSyncStatus? syncStatus,
     bool? isDeleted,
   }) {
     return Ingredient(

lib/models/nutrient.dart

@@ -0,0 +1,87 @@
+
+
+class Nutrient {
+  final String name;
+  final String unit;
+  final String rdaType;
+  final String? note;
+  final UpperLimit? ul; // nutrient-level UL (optional)
+  final List<LifeStage> lifeStages;
+
+  Nutrient({
+    required this.name,
+    required this.unit,
+    required this.rdaType,
+    this.note,
+    this.ul,
+    required this.lifeStages,
+  });
+
+  factory Nutrient.fromJson(String name, Map<String, dynamic> json) {
+    return Nutrient(
+      name: name,
+      unit: json['unit'],
+      rdaType: json['rda_type'],
+      note: json['note'],
+      ul: (json['ul'] is Map<String, dynamic>) ? UpperLimit.fromJson(json['ul'] as Map<String, dynamic>) : null,
+      lifeStages: (json['life_stages'] as List)
+          .map((stage) => LifeStage.fromJson(stage))
+          .toList(),
+    );
+  }
+}
+
+class LifeStage {
+  final String ageRange;
+  final String sex;
+  final double value;
+  final double? valueMin;
+  final double? valueMax;
+  final double? ul;
+  final String? description;
+
+  LifeStage({
+    required this.ageRange,
+    required this.sex,
+    required this.value,
+    this.valueMin,
+    this.valueMax,
+    this.ul,
+    this.description,
+  });
+
+  factory LifeStage.fromJson(Map<String, dynamic> json) {
+    return LifeStage(
+      ageRange: json['age_range'],
+      sex: json['sex'],
+      value: (json['value'] as num?)?.toDouble() ?? 0.0,
+      valueMin: json['value_min'] != null ? (json['value_min'] as num).toDouble() : null,
+      valueMax: json['value_max'] != null ? (json['value_max'] as num).toDouble() : null,
+      ul: json['ul'] != null ? (json['ul'] as num).toDouble() : null,
+      description: json['description'],
+    );
+  }
+}
+
+class UpperLimit {
+  final double value;
+  final String unit;
+  final String? duration;
+  final String? note;
+
+  const UpperLimit({
+    required this.value,
+    required this.unit,
+    this.duration,
+    this.note,
+  });
+
+  factory UpperLimit.fromJson(Map<String, dynamic> json) {
+    return UpperLimit(
+      value: (json['value'] as num).toDouble(),
+      unit: json['unit'] ?? '',
+      duration: json['duration'],
+      note: json['note'],
+    );
+  }
+}

lib/models/supplement.dart

@@ -2,8 +2,8 @@ import 'dart:convert';
 
 import 'package:uuid/uuid.dart';
 
+import '../services/database_sync_service.dart';
 import 'ingredient.dart';
-import 'sync_enums.dart';
 
 class Supplement {
   final int? id;
@@ -21,7 +21,7 @@ class Supplement {
   // Sync metadata
   final String syncId;
   final DateTime lastModified;
-  final SyncStatus syncStatus;
+  final RecordSyncStatus syncStatus;
   final bool isDeleted;
 
   Supplement({
@@ -38,7 +38,7 @@ class Supplement {
     this.isActive = true,
     String? syncId,
     DateTime? lastModified,
-    this.syncStatus = SyncStatus.pending,
+    this.syncStatus = RecordSyncStatus.pending,
     this.isDeleted = false,
   }) : syncId = syncId ?? const Uuid().v4(),
        lastModified = lastModified ?? DateTime.now();
@@ -69,8 +69,7 @@ class Supplement {
   }
 
   Map<String, dynamic> toMap() {
-    return {
+    final map = <String, dynamic>{
-      'id': id,
       'name': name,
       'brand': brand,
       'ingredients': jsonEncode(ingredients.map((ingredient) => ingredient.toMap()).toList()),
@@ -86,6 +85,12 @@ class Supplement {
       'syncStatus': syncStatus.name,
       'isDeleted': isDeleted ? 1 : 0,
     };
+
+    if (id != null) {
+      map['id'] = id;
+    }
+
+    return map;
   }
 
   factory Supplement.fromMap(Map<String, dynamic> map) {
@@ -122,17 +127,18 @@ class Supplement {
           ? DateTime.parse(map['lastModified'])
           : DateTime.now(),
       syncStatus: map['syncStatus'] != null
-          ? SyncStatus.values.firstWhere(
+          ? RecordSyncStatus.values.firstWhere(
               (e) => e.name == map['syncStatus'],
-              orElse: () => SyncStatus.pending,
+              orElse: () => RecordSyncStatus.pending,
             )
-          : SyncStatus.pending,
+          : RecordSyncStatus.pending,
       isDeleted: (map['isDeleted'] ?? 0) == 1,
     );
   }
 
   Supplement copyWith({
     int? id,
+    bool setNullId = false,
     String? name,
     String? brand,
     List<Ingredient>? ingredients,
@@ -144,12 +150,13 @@ class Supplement {
     DateTime? createdAt,
     bool? isActive,
     String? syncId,
+    bool newSyncId = false,
     DateTime? lastModified,
-    SyncStatus? syncStatus,
+    RecordSyncStatus? syncStatus,
     bool? isDeleted,
   }) {
     return Supplement(
-      id: id ?? this.id,
+      id: setNullId ? null : (id ?? this.id),
       name: name ?? this.name,
       brand: brand ?? this.brand,
       ingredients: ingredients ?? this.ingredients,
@@ -160,7 +167,7 @@ class Supplement {
       notes: notes ?? this.notes,
       createdAt: createdAt ?? this.createdAt,
       isActive: isActive ?? this.isActive,
-      syncId: syncId ?? this.syncId,
+      syncId: newSyncId ? null : (syncId ?? this.syncId),
       lastModified: lastModified ?? this.lastModified,
       syncStatus: syncStatus ?? this.syncStatus,
       isDeleted: isDeleted ?? this.isDeleted,
@@ -171,14 +178,14 @@ class Supplement {
   Supplement markAsModified() {
     return copyWith(
       lastModified: DateTime.now(),
-      syncStatus: SyncStatus.modified,
+      syncStatus: RecordSyncStatus.modified,
     );
   }
 
   /// Create a new supplement marked as synced
   Supplement markAsSynced() {
     return copyWith(
-      syncStatus: SyncStatus.synced,
+      syncStatus: RecordSyncStatus.synced,
     );
   }
 
@@ -187,7 +194,7 @@ class Supplement {
     return copyWith(
       isDeleted: true,
       lastModified: DateTime.now(),
-      syncStatus: SyncStatus.modified,
+      syncStatus: RecordSyncStatus.modified,
     );
   }
 }

lib/models/supplement_intake.dart

@@ -1,6 +1,6 @@
 import 'package:uuid/uuid.dart';
 
-import 'sync_enums.dart';
+import '../services/database_sync_service.dart';
 
 class SupplementIntake {
   final int? id;
@@ -13,7 +13,7 @@ class SupplementIntake {
   // Sync metadata
   final String syncId;
   final DateTime lastModified;
-  final SyncStatus syncStatus;
+  final RecordSyncStatus syncStatus;
   final bool isDeleted;
 
   SupplementIntake({
@@ -25,7 +25,7 @@ class SupplementIntake {
     this.notes,
     String? syncId,
     DateTime? lastModified,
-    this.syncStatus = SyncStatus.pending,
+    this.syncStatus = RecordSyncStatus.pending,
     this.isDeleted = false,
   }) : syncId = syncId ?? const Uuid().v4(),
        lastModified = lastModified ?? DateTime.now();
@@ -58,11 +58,11 @@ class SupplementIntake {
           ? DateTime.parse(map['lastModified'])
           : DateTime.now(),
       syncStatus: map['syncStatus'] != null
-          ? SyncStatus.values.firstWhere(
+          ? RecordSyncStatus.values.firstWhere(
               (e) => e.name == map['syncStatus'],
-              orElse: () => SyncStatus.pending,
+              orElse: () => RecordSyncStatus.pending,
             )
-          : SyncStatus.pending,
+          : RecordSyncStatus.pending,
       isDeleted: (map['isDeleted'] ?? 0) == 1,
     );
   }
@@ -76,7 +76,7 @@ class SupplementIntake {
     String? notes,
     String? syncId,
     DateTime? lastModified,
-    SyncStatus? syncStatus,
+    RecordSyncStatus? syncStatus,
     bool? isDeleted,
   }) {
     return SupplementIntake(
@@ -96,7 +96,7 @@ class SupplementIntake {
   /// Create a new intake marked as synced
   SupplementIntake markAsSynced() {
     return copyWith(
-      syncStatus: SyncStatus.synced,
+      syncStatus: RecordSyncStatus.synced,
     );
   }
 
@@ -105,7 +105,7 @@ class SupplementIntake {
     return copyWith(
       isDeleted: true,
       lastModified: DateTime.now(),
-      syncStatus: SyncStatus.modified,
+      syncStatus: RecordSyncStatus.modified,
     );
   }
 }

lib/models/sync_data.dart

@@ -1,314 +0,0 @@
-import 'dart:convert';
-
-import 'supplement.dart';
-import 'supplement_intake.dart';
-import 'sync_enums.dart';
-
-/// Model representing the complete sync data structure
-/// This is what gets serialized to JSON and synced via WebDAV
-class SyncData {
-  final int version;
-  final String deviceId;
-  final String deviceName;
-  final DateTime syncTimestamp;
-  final List<Supplement> supplements;
-  final List<SupplementIntake> intakes;
-  final Map<String, dynamic> metadata;
-
-  const SyncData({
-    required this.version,
-    required this.deviceId,
-    required this.deviceName,
-    required this.syncTimestamp,
-    required this.supplements,
-    required this.intakes,
-    this.metadata = const {},
-  });
-
-  /// Convert sync data to JSON map
-  Map<String, dynamic> toJson() {
-    return {
-      'version': version,
-      'deviceId': deviceId,
-      'deviceName': deviceName,
-      'syncTimestamp': syncTimestamp.toIso8601String(),
-      'supplements': supplements.map((s) => s.toMap()).toList(),
-      'intakes': intakes.map((i) => i.toMap()).toList(),
-      'metadata': metadata,
-    };
-  }
-
-  /// Create sync data from JSON map
-  factory SyncData.fromJson(Map<String, dynamic> json) {
-    return SyncData(
-      version: json['version'] ?? 1,
-      deviceId: json['deviceId'] ?? '',
-      deviceName: json['deviceName'] ?? 'Unknown Device',
-      syncTimestamp: json['syncTimestamp'] != null
-          ? DateTime.parse(json['syncTimestamp'])
-          : DateTime.now(),
-      supplements: (json['supplements'] as List<dynamic>? ?? [])
-          .map((s) => Supplement.fromMap(s as Map<String, dynamic>))
-          .toList(),
-      intakes: (json['intakes'] as List<dynamic>? ?? [])
-          .map((i) => SupplementIntake.fromMap(i as Map<String, dynamic>))
-          .toList(),
-      metadata: json['metadata'] as Map<String, dynamic>? ?? {},
-    );
-  }
-
-  /// Convert sync data to JSON string
-  String toJsonString() {
-    return jsonEncode(toJson());
-  }
-
-  /// Create sync data from JSON string
-  factory SyncData.fromJsonString(String jsonString) {
-    final json = jsonDecode(jsonString) as Map<String, dynamic>;
-    return SyncData.fromJson(json);
-  }
-
-  /// Create a copy with updated values
-  SyncData copyWith({
-    int? version,
-    String? deviceId,
-    String? deviceName,
-    DateTime? syncTimestamp,
-    List<Supplement>? supplements,
-    List<SupplementIntake>? intakes,
-    Map<String, dynamic>? metadata,
-  }) {
-    return SyncData(
-      version: version ?? this.version,
-      deviceId: deviceId ?? this.deviceId,
-      deviceName: deviceName ?? this.deviceName,
-      syncTimestamp: syncTimestamp ?? this.syncTimestamp,
-      supplements: supplements ?? this.supplements,
-      intakes: intakes ?? this.intakes,
-      metadata: metadata ?? this.metadata,
-    );
-  }
-
-  @override
-  String toString() {
-    return 'SyncData(version: $version, deviceId: $deviceId, '
-        'deviceName: $deviceName, syncTimestamp: $syncTimestamp, '
-        'supplements: ${supplements.length}, intakes: ${intakes.length})';
-  }
-}
-
-/// Model representing a sync conflict
-class SyncConflict {
-  final String syncId;
-  final ConflictType type;
-  final DateTime localTimestamp;
-  final DateTime remoteTimestamp;
-  final Map<String, dynamic> localData;
-  final Map<String, dynamic> remoteData;
-  final ConflictResolutionStrategy? suggestedResolution;
-
-  const SyncConflict({
-    required this.syncId,
-    required this.type,
-    required this.localTimestamp,
-    required this.remoteTimestamp,
-    required this.localData,
-    required this.remoteData,
-    this.suggestedResolution,
-  });
-
-  Map<String, dynamic> toJson() {
-    return {
-      'syncId': syncId,
-      'type': type.name,
-      'localTimestamp': localTimestamp.toIso8601String(),
-      'remoteTimestamp': remoteTimestamp.toIso8601String(),
-      'localData': localData,
-      'remoteData': remoteData,
-      'suggestedResolution': suggestedResolution?.name,
-    };
-  }
-
-  factory SyncConflict.fromJson(Map<String, dynamic> json) {
-    return SyncConflict(
-      syncId: json['syncId'],
-      type: ConflictType.values.firstWhere(
-        (e) => e.name == json['type'],
-        orElse: () => ConflictType.modification,
-      ),
-      localTimestamp: DateTime.parse(json['localTimestamp']),
-      remoteTimestamp: DateTime.parse(json['remoteTimestamp']),
-      localData: json['localData'] as Map<String, dynamic>,
-      remoteData: json['remoteData'] as Map<String, dynamic>,
-      suggestedResolution: json['suggestedResolution'] != null
-          ? ConflictResolutionStrategy.values.firstWhere(
-              (e) => e.name == json['suggestedResolution'],
-              orElse: () => ConflictResolutionStrategy.manual,
-            )
-          : null,
-    );
-  }
-
-  /// Get human-readable description of the conflict
-  String get description {
-    switch (type) {
-      case ConflictType.modification:
-        return 'Item modified on both devices';
-      case ConflictType.deletion:
-        return 'Item deleted on one device, modified on another';
-      case ConflictType.creation:
-        return 'Item created with same ID on both devices';
-    }
-  }
-
-  /// Determine if local version is newer
-  bool get isLocalNewer => localTimestamp.isAfter(remoteTimestamp);
-
-  /// Determine if remote version is newer
-  bool get isRemoteNewer => remoteTimestamp.isAfter(localTimestamp);
-
-  /// Check if timestamps are identical
-  bool get haveSameTimestamp => localTimestamp.isAtSameMomentAs(remoteTimestamp);
-}
-
-/// Types of sync conflicts
-enum ConflictType {
-  /// Both local and remote versions were modified
-  modification,
-
-  /// One version was deleted while the other was modified
-  deletion,
-
-  /// Same item was created on both devices
-  creation,
-}
-
-/// Model for sync operation results
-class SyncResult {
-  final bool success;
-  final DateTime timestamp;
-  final SyncOperationStatus status;
-  final String? error;
-  final List<SyncConflict> conflicts;
-  final SyncStatistics statistics;
-
-  const SyncResult({
-    required this.success,
-    required this.timestamp,
-    required this.status,
-    this.error,
-    this.conflicts = const [],
-    this.statistics = const SyncStatistics(),
-  });
-
-  Map<String, dynamic> toJson() {
-    return {
-      'success': success,
-      'timestamp': timestamp.toIso8601String(),
-      'status': status.name,
-      'error': error,
-      'conflicts': conflicts.map((c) => c.toJson()).toList(),
-      'statistics': statistics.toJson(),
-    };
-  }
-
-  factory SyncResult.fromJson(Map<String, dynamic> json) {
-    return SyncResult(
-      success: json['success'] ?? false,
-      timestamp: DateTime.parse(json['timestamp']),
-      status: SyncOperationStatus.values.firstWhere(
-        (e) => e.name == json['status'],
-        orElse: () => SyncOperationStatus.idle,
-      ),
-      error: json['error'],
-      conflicts: (json['conflicts'] as List<dynamic>? ?? [])
-          .map((c) => SyncConflict.fromJson(c as Map<String, dynamic>))
-          .toList(),
-      statistics: json['statistics'] != null
-          ? SyncStatistics.fromJson(json['statistics'] as Map<String, dynamic>)
-          : const SyncStatistics(),
-    );
-  }
-
-  /// Create a failed sync result
-  factory SyncResult.failure({
-    required String error,
-    required SyncOperationStatus status,
-    List<SyncConflict> conflicts = const [],
-  }) {
-    return SyncResult(
-      success: false,
-      timestamp: DateTime.now(),
-      status: status,
-      error: error,
-      conflicts: conflicts,
-    );
-  }
-
-  /// Create a successful sync result
-  factory SyncResult.success({
-    List<SyncConflict> conflicts = const [],
-    SyncStatistics statistics = const SyncStatistics(),
-  }) {
-    return SyncResult(
-      success: true,
-      timestamp: DateTime.now(),
-      status: conflicts.isEmpty
-          ? SyncOperationStatus.success
-          : SyncOperationStatus.conflictsDetected,
-      conflicts: conflicts,
-      statistics: statistics,
-    );
-  }
-}
-
-/// Statistics about sync operations
-class SyncStatistics {
-  final int supplementsUploaded;
-  final int supplementsDownloaded;
-  final int intakesUploaded;
-  final int intakesDownloaded;
-  final int conflictsResolved;
-  final Duration syncDuration;
-
-  const SyncStatistics({
-    this.supplementsUploaded = 0,
-    this.supplementsDownloaded = 0,
-    this.intakesUploaded = 0,
-    this.intakesDownloaded = 0,
-    this.conflictsResolved = 0,
-    this.syncDuration = Duration.zero,
-  });
-
-  Map<String, dynamic> toJson() {
-    return {
-      'supplementsUploaded': supplementsUploaded,
-      'supplementsDownloaded': supplementsDownloaded,
-      'intakesUploaded': intakesUploaded,
-      'intakesDownloaded': intakesDownloaded,
-      'conflictsResolved': conflictsResolved,
-      'syncDurationMs': syncDuration.inMilliseconds,
-    };
-  }
-
-  factory SyncStatistics.fromJson(Map<String, dynamic> json) {
-    return SyncStatistics(
-      supplementsUploaded: json['supplementsUploaded'] ?? 0,
-      supplementsDownloaded: json['supplementsDownloaded'] ?? 0,
-      intakesUploaded: json['intakesUploaded'] ?? 0,
-      intakesDownloaded: json['intakesDownloaded'] ?? 0,
-      conflictsResolved: json['conflictsResolved'] ?? 0,
-      syncDuration: Duration(milliseconds: json['syncDurationMs'] ?? 0),
-    );
-  }
-
-  int get totalUploaded => supplementsUploaded + intakesUploaded;
-  int get totalDownloaded => supplementsDownloaded + intakesDownloaded;
-  int get totalSynced => totalUploaded + totalDownloaded;
-
-  @override
-  String toString() {
-    return 'SyncStatistics(uploaded: $totalUploaded, downloaded: $totalDownloaded, '
-        'conflicts: $conflictsResolved, duration: ${syncDuration.inSeconds}s)';
-  }
-}

lib/models/sync_enums.dart

@@ -1,178 +0,0 @@
-/// Enumeration for sync status of individual records
-enum SyncStatus {
-  /// Record is newly created and needs to be synced
-  pending,
-
-  /// Record is in sync with remote server
-  synced,
-
-  /// Record has been modified locally and needs to be synced
-  modified,
-
-  /// Record has a conflict that needs resolution
-  conflict,
-
-  /// Record is being synced (temporary state)
-  syncing,
-
-  /// Record sync failed and will be retried
-  failed,
-}
-
-/// Enumeration for overall sync operation status
-enum SyncOperationStatus {
-  /// No sync operation in progress
-  idle,
-
-  /// Currently syncing data
-  syncing,
-
-  /// Last sync completed successfully
-  success,
-
-  /// Last sync failed due to network issues
-  networkError,
-
-  /// Last sync failed due to authentication issues
-  authenticationError,
-
-  /// Last sync failed due to server issues
-  serverError,
-
-  /// Last sync had conflicts that need resolution
-  conflictsDetected,
-
-  /// Sync cancelled by user
-  cancelled,
-}
-
-/// Enumeration for conflict resolution strategies
-enum ConflictResolutionStrategy {
-  /// Always prefer local changes
-  preferLocal,
-
-  /// Always prefer remote changes
-  preferRemote,
-
-  /// Prefer the most recently modified record
-  preferNewer,
-
-  /// Ask user to resolve conflicts manually
-  manual,
-}
-
-/// Enumeration for sync frequency options
-enum SyncFrequency {
-  /// Manual sync only
-  manual,
-
-  /// Sync every 15 minutes
-  every15Minutes,
-
-  /// Sync every hour
-  hourly,
-
-  /// Sync every 6 hours
-  every6Hours,
-
-  /// Sync once per day
-  daily,
-}
-
-/// Extension to get human-readable names for SyncStatus
-extension SyncStatusExtension on SyncStatus {
-  String get displayName {
-    switch (this) {
-      case SyncStatus.pending:
-        return 'Pending Sync';
-      case SyncStatus.synced:
-        return 'Synced';
-      case SyncStatus.modified:
-        return 'Modified';
-      case SyncStatus.conflict:
-        return 'Conflict';
-      case SyncStatus.syncing:
-        return 'Syncing...';
-      case SyncStatus.failed:
-        return 'Sync Failed';
-    }
-  }
-}
-
-/// Extension to get human-readable names for SyncOperationStatus
-extension SyncOperationStatusExtension on SyncOperationStatus {
-  String get displayName {
-    switch (this) {
-      case SyncOperationStatus.idle:
-        return 'Ready';
-      case SyncOperationStatus.syncing:
-        return 'Syncing...';
-      case SyncOperationStatus.success:
-        return 'Sync Complete';
-      case SyncOperationStatus.networkError:
-        return 'Network Error';
-      case SyncOperationStatus.authenticationError:
-        return 'Authentication Failed';
-      case SyncOperationStatus.serverError:
-        return 'Server Error';
-      case SyncOperationStatus.conflictsDetected:
-        return 'Conflicts Detected';
-      case SyncOperationStatus.cancelled:
-        return 'Sync Cancelled';
-    }
-  }
-}
-
-/// Extension to get duration for SyncFrequency
-extension SyncFrequencyExtension on SyncFrequency {
-  Duration get duration {
-    switch (this) {
-      case SyncFrequency.manual:
-        return Duration.zero; // Manual sync only
-      case SyncFrequency.every15Minutes:
-        return const Duration(minutes: 15);
-      case SyncFrequency.hourly:
-        return const Duration(hours: 1);
-      case SyncFrequency.every6Hours:
-        return const Duration(hours: 6);
-      case SyncFrequency.daily:
-        return const Duration(days: 1);
-    }
-  }
-
-  String get displayName {
-    switch (this) {
-      case SyncFrequency.manual:
-        return 'Manual Only';
-      case SyncFrequency.every15Minutes:
-        return 'Every 15 Minutes';
-      case SyncFrequency.hourly:
-        return 'Hourly';
-      case SyncFrequency.every6Hours:
-        return 'Every 6 Hours';
-      case SyncFrequency.daily:
-        return 'Daily';
-    }
-  }
-}
-
-/// Constants for sync operations
-class SyncConstants {
-  static const String syncFileName = 'supplements_sync.json';
-  static const String syncFileBackupName = 'supplements_sync_backup.json';
-  static const int currentSyncVersion = 1;
-  static const int maxRetryAttempts = 3;
-  static const Duration networkTimeout = Duration(seconds: 30);
-  static const Duration conflictResolutionTimeout = Duration(minutes: 5);
-
-  /// Default WebDAV paths for different cloud providers
-  static const String nextcloudWebdavPath = '/remote.php/dav/files/';
-  static const String owncloudWebdavPath = '/remote.php/webdav/';
-
-  /// Supported cloud providers
-  static const List<String> supportedProviders = [
-    'Nextcloud',
-    'ownCloud',
-    'Generic WebDAV',
-  ];
-}

lib/providers/settings_provider.dart

@@ -10,6 +10,10 @@ enum ThemeOption {
 class SettingsProvider extends ChangeNotifier {
   ThemeOption _themeOption = ThemeOption.system;
 
+  // Profile fields
+  DateTime? _dateOfBirth;
+  String? _gender;
+
   // Time range settings (stored as hours, 0-23)
   int _morningStart = 5;
   int _morningEnd = 10;
@@ -25,8 +29,25 @@ class SettingsProvider extends ChangeNotifier {
   int _reminderRetryInterval = 5; // minutes
   int _maxRetryAttempts = 3;
 
+  // Auto-sync settings
+  bool _autoSyncEnabled = false;
+  int _autoSyncDebounceSeconds = 5;
+
   ThemeOption get themeOption => _themeOption;
 
+  // Profile getters
+  DateTime? get dateOfBirth => _dateOfBirth;
+  String? get gender => _gender;
+  int? get age {
+    if (_dateOfBirth == null) return null;
+    final now = DateTime.now();
+    int years = now.year - _dateOfBirth!.year;
+    final hasHadBirthday = (now.month > _dateOfBirth!.month) ||
+        (now.month == _dateOfBirth!.month && now.day >= _dateOfBirth!.day);
+    if (!hasHadBirthday) years--;
+    return years;
+  }
+
   // Time range getters
   int get morningStart => _morningStart;
   int get morningEnd => _morningEnd;
@@ -42,6 +63,10 @@ class SettingsProvider extends ChangeNotifier {
   int get reminderRetryInterval => _reminderRetryInterval;
   int get maxRetryAttempts => _maxRetryAttempts;
 
+  // Auto-sync getters
+  bool get autoSyncEnabled => _autoSyncEnabled;
+  int get autoSyncDebounceSeconds => _autoSyncDebounceSeconds;
+
   // Helper method to get formatted time ranges for display
   String get morningRange => '${_formatHour(_morningStart)} - ${_formatHour((_morningEnd + 1) % 24)}';
   String get afternoonRange => '${_formatHour(_afternoonStart)} - ${_formatHour((_afternoonEnd + 1) % 24)}';
@@ -68,6 +93,13 @@ class SettingsProvider extends ChangeNotifier {
     final themeIndex = prefs.getInt('theme_option') ?? 0;
     _themeOption = ThemeOption.values[themeIndex];
 
+    // Load profile fields
+    final dobString = prefs.getString('date_of_birth');
+    if (dobString != null) {
+      _dateOfBirth = DateTime.tryParse(dobString);
+    }
+    _gender = prefs.getString('gender');
+
     // Load time range settings
     _morningStart = prefs.getInt('morning_start') ?? 5;
     _morningEnd = prefs.getInt('morning_end') ?? 10;
@@ -83,6 +115,10 @@ class SettingsProvider extends ChangeNotifier {
     _reminderRetryInterval = prefs.getInt('reminder_retry_interval') ?? 5;
     _maxRetryAttempts = prefs.getInt('max_retry_attempts') ?? 3;
 
+    // Load auto-sync settings
+    _autoSyncEnabled = prefs.getBool('auto_sync_enabled') ?? false;
+    _autoSyncDebounceSeconds = prefs.getInt('auto_sync_debounce_seconds') ?? 30;
+
     notifyListeners();
   }
 
@@ -94,6 +130,16 @@ class SettingsProvider extends ChangeNotifier {
     await prefs.setInt('theme_option', option.index);
   }
 
+  Future<void> setDateOfBirthAndGender(DateTime dateOfBirth, String gender) async {
+    _dateOfBirth = dateOfBirth;
+    _gender = gender;
+    notifyListeners();
+
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString('date_of_birth', dateOfBirth.toIso8601String());
+    await prefs.setString('gender', gender);
+  }
+
   Future<void> setTimeRanges({
     required int morningStart,
     required int morningEnd,
@@ -256,4 +302,21 @@ class SettingsProvider extends ChangeNotifier {
     final prefs = await SharedPreferences.getInstance();
     await prefs.setInt('max_retry_attempts', attempts);
   }
+
+  // Auto-sync setters
+  Future<void> setAutoSyncEnabled(bool enabled) async {
+    _autoSyncEnabled = enabled;
+    notifyListeners();
+
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool('auto_sync_enabled', enabled);
+  }
+
+  Future<void> setAutoSyncDebounceSeconds(int seconds) async {
+    _autoSyncDebounceSeconds = seconds;
+    notifyListeners();
+
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setInt('auto_sync_debounce_seconds', seconds);
+  }
 }

lib/providers/simple_sync_provider.dart

@@ -0,0 +1,170 @@
+import 'package:flutter/foundation.dart';
+
+import '../services/database_sync_service.dart';
+import '../services/auto_sync_service.dart';
+import 'settings_provider.dart';
+
+class SimpleSyncProvider with ChangeNotifier {
+  final DatabaseSyncService _syncService = DatabaseSyncService();
+  
+  // Callback for UI refresh after sync
+  VoidCallback? _onSyncCompleteCallback;
+  
+  // Auto-sync service
+  AutoSyncService? _autoSyncService;
+  
+  // Track if current sync is auto-triggered
+  bool _isAutoSync = false;
+  
+  // Getters
+  SyncStatus get status => _syncService.status;
+  String? get lastError => _syncService.lastError;
+  DateTime? get lastSyncTime => _syncService.lastSyncTime;
+  bool get isConfigured => _syncService.isConfigured;
+  bool get isSyncing => status == SyncStatus.downloading || 
+                        status == SyncStatus.merging || 
+                        status == SyncStatus.uploading;
+  bool get isAutoSync => _isAutoSync;
+  AutoSyncService? get autoSyncService => _autoSyncService;
+  
+  // Auto-sync error handling getters
+  bool get isAutoSyncDisabledDueToErrors => _autoSyncService?.isAutoDisabledDueToErrors ?? false;
+  int get autoSyncConsecutiveFailures => _autoSyncService?.consecutiveFailures ?? 0;
+  String? get autoSyncLastError => _autoSyncService?.lastErrorMessage;
+  bool get hasAutoSyncScheduledRetry => _autoSyncService?.hasScheduledRetry ?? false;
+  
+  // Configuration getters
+  String? get serverUrl => _syncService.serverUrl;
+  String? get username => _syncService.username;
+  String? get password => _syncService.password;
+  String? get remotePath => _syncService.remotePath;
+
+  SimpleSyncProvider() {
+    // Set up callbacks to notify listeners
+    _syncService.onStatusChanged = (_) => notifyListeners();
+    _syncService.onError = (_) => notifyListeners();
+    _syncService.onSyncCompleted = () {
+      notifyListeners();
+      // Trigger UI refresh callback if set
+      _onSyncCompleteCallback?.call();
+    };
+    
+    // Load saved configuration and notify listeners when done
+    _loadConfiguration();
+  }
+
+  /// Set callback to refresh UI data after sync completes
+  void setOnSyncCompleteCallback(VoidCallback? callback) {
+    _onSyncCompleteCallback = callback;
+  }
+
+  /// Initialize auto-sync service with settings provider
+  void initializeAutoSync(SettingsProvider settingsProvider) {
+    _autoSyncService = AutoSyncService(
+      syncProvider: this,
+      settingsProvider: settingsProvider,
+    );
+    
+    if (kDebugMode) {
+      print('SimpleSyncProvider: Auto-sync service initialized');
+    }
+  }
+
+  /// Triggers auto-sync if enabled and configured
+  void triggerAutoSyncIfEnabled() {
+    _autoSyncService?.triggerAutoSync();
+  }
+
+  Future<void> _loadConfiguration() async {
+    await _syncService.loadSavedConfiguration();
+    notifyListeners(); // Notify UI that configuration might be available
+  }
+
+  Future<void> configure({
+    required String serverUrl,
+    required String username,
+    required String password,
+    required String remotePath,
+  }) async {
+    _syncService.configure(
+      serverUrl: serverUrl,
+      username: username,
+      password: password,
+      remotePath: remotePath,
+    );
+    notifyListeners();
+  }
+
+  Future<bool> testConnection() async {
+    return await _syncService.testConnection();
+  }
+
+  Future<void> syncDatabase({bool isAutoSync = false}) async {
+    if (!isConfigured) {
+      throw Exception('Sync not configured');
+    }
+    
+    _isAutoSync = isAutoSync;
+    notifyListeners();
+    
+    try {
+      await _syncService.syncDatabase();
+    } catch (e) {
+      if (kDebugMode) {
+        print('SupplementsLog: Sync failed in provider: $e');
+      }
+      rethrow;
+    } finally {
+      _isAutoSync = false;
+      notifyListeners();
+    }
+  }
+
+  void clearError() {
+    _syncService.clearError();
+    notifyListeners();
+  }
+
+  /// Resets auto-sync error state and re-enables auto-sync if it was disabled
+  void resetAutoSyncErrors() {
+    _autoSyncService?.resetErrorState();
+    notifyListeners();
+  }
+
+  String getStatusText() {
+    final syncType = _isAutoSync ? 'Auto-sync' : 'Sync';
+    
+    // Check for auto-sync specific errors first
+    if (isAutoSyncDisabledDueToErrors) {
+      return 'Auto-sync disabled due to repeated failures. ${autoSyncLastError ?? 'Check sync settings.'}';
+    }
+    
+    switch (status) {
+      case SyncStatus.idle:
+        if (hasAutoSyncScheduledRetry) {
+          return 'Auto-sync will retry shortly...';
+        }
+        return 'Ready to sync';
+      case SyncStatus.downloading:
+        return '$syncType: Downloading remote database...';
+      case SyncStatus.merging:
+        return '$syncType: Merging databases...';
+      case SyncStatus.uploading:
+        return '$syncType: Uploading database...';
+      case SyncStatus.completed:
+        return '$syncType completed successfully';
+      case SyncStatus.error:
+        // For auto-sync errors, show more specific messages
+        if (_isAutoSync && autoSyncLastError != null) {
+          return 'Auto-sync failed: $autoSyncLastError';
+        }
+        return '$syncType failed: ${lastError ?? 'Unknown error'}';
+    }
+  }
+
+  @override
+  void dispose() {
+    _autoSyncService?.dispose();
+    super.dispose();
+  }
+}

lib/providers/supplement_provider.dart

@@ -7,6 +7,7 @@ import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import '../models/supplement.dart';
 import '../models/supplement_intake.dart';
 import '../services/database_helper.dart';
+import '../services/database_sync_service.dart';
 import '../services/notification_service.dart';
 
 class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
@@ -46,31 +47,31 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     await _notificationService.initialize();
 
     // Set up the callback for handling supplement intake from notifications
-    print('📱 Setting up notification callback...');
+    print('SupplementsLog: 📱 Setting up notification callback...');
     _notificationService.setTakeSupplementCallback((supplementId, supplementName, units, unitType) {
-      print('📱 === NOTIFICATION CALLBACK TRIGGERED ===');
+      print('SupplementsLog: 📱 === NOTIFICATION CALLBACK TRIGGERED ===');
-      print('📱 Supplement ID: $supplementId');
+      print('SupplementsLog: 📱 Supplement ID: $supplementId');
-      print('📱 Supplement Name: $supplementName');
+      print('SupplementsLog: 📱 Supplement Name: $supplementName');
-      print('📱 Units: $units');
+      print('SupplementsLog: 📱 Units: $units');
-      print('📱 Unit Type: $unitType');
+      print('SupplementsLog: 📱 Unit Type: $unitType');
 
       // Record the intake when user taps "Take" on notification
       recordIntake(supplementId, 0.0, unitsTaken: units);
-      print('📱 Intake recorded successfully');
+      print('SupplementsLog: 📱 Intake recorded successfully');
-      print('📱 === CALLBACK COMPLETE ===');
+      print('SupplementsLog: 📱 === CALLBACK COMPLETE ===');
 
       if (kDebugMode) {
-        print('📱 Recorded intake from notification: $supplementName ($units $unitType)');
+        print('SupplementsLog: 📱 Recorded intake from notification: $supplementName ($units $unitType)');
       }
     });
-    print('📱 Notification callback setup complete');
+    print('SupplementsLog: 📱 Notification callback setup complete');
 
     // Request permissions with error handling
     try {
       await _notificationService.requestPermissions();
     } catch (e) {
       if (kDebugMode) {
-        print('Error requesting notification permissions: $e');
+        print('SupplementsLog: Error requesting notification permissions: $e');
       }
       // Continue without notifications rather than crashing
     }
@@ -99,7 +100,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
         await _checkPersistentReminders();
       } catch (e) {
         if (kDebugMode) {
-          print('Error checking persistent reminders: $e');
+          print('SupplementsLog: Error checking persistent reminders: $e');
         }
       }
     });
@@ -120,8 +121,8 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
 
       if (currentDate != lastCheckDate) {
         if (kDebugMode) {
-          print('Date changed detected: ${lastCheckDate} -> ${currentDate}');
+          print('SupplementsLog: Date changed detected: ${lastCheckDate} -> ${currentDate}');
-          print('Refreshing today\'s intakes for new day...');
+          print('SupplementsLog: Refreshing today\'s intakes for new day...');
         }
 
         // Date has changed, refresh today's intakes
@@ -129,7 +130,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
         await loadTodayIntakes();
 
         if (kDebugMode) {
-          print('Today\'s intakes refreshed for new day');
+          print('SupplementsLog: Today\'s intakes refreshed for new day');
         }
       }
     });
@@ -140,7 +141,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     // For now, we'll check with default settings
     // In practice, the UI should call checkPersistentRemindersWithSettings
     if (kDebugMode) {
-      print('📱 Checking persistent reminders with default settings');
+      print('SupplementsLog: 📱 Checking persistent reminders with default settings');
     }
   }
 
@@ -150,7 +151,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     required int reminderRetryInterval,
     required int maxRetryAttempts,
   }) async {
-    print('📱 🔄 MANUAL CHECK: Persistent reminders called from UI');
+    print('SupplementsLog: 📱 🔄 MANUAL CHECK: Persistent reminders called from UI');
     await _notificationService.checkPersistentReminders(
       persistentReminders,
       reminderRetryInterval,
@@ -160,7 +161,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
 
   // Add a manual trigger method for testing
   Future<void> triggerRetryCheck() async {
-    print('📱 🚨 MANUAL TRIGGER: Forcing retry check...');
+    print('SupplementsLog: 📱 🚨 MANUAL TRIGGER: Forcing retry check...');
     await checkPersistentRemindersWithSettings(
       persistentReminders: true,
       reminderRetryInterval: 5, // Force 5 minute interval for testing
@@ -183,7 +184,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     if (state == AppLifecycleState.resumed) {
       // App came back to foreground, check if date changed
       if (kDebugMode) {
-        print('App resumed, checking for date change...');
+        print('SupplementsLog: App resumed, checking for date change...');
       }
       forceCheckDateChange();
     }
@@ -191,7 +192,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
 
   Future<void> _rescheduleAllNotifications() async {
     if (kDebugMode) {
-      print('📱 Rescheduling notifications for all active supplements...');
+      print('SupplementsLog: 📱 Rescheduling notifications for all active supplements...');
     }
 
     for (final supplement in _supplements) {
@@ -200,14 +201,14 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
           await _notificationService.scheduleSupplementReminders(supplement);
         } catch (e) {
           if (kDebugMode) {
-            print('📱 Error rescheduling notifications for ${supplement.name}: $e');
+            print('SupplementsLog: 📱 Error rescheduling notifications for ${supplement.name}: $e');
           }
         }
       }
     }
 
     if (kDebugMode) {
-      print('📱 Finished rescheduling notifications');
+      print('SupplementsLog: 📱 Finished rescheduling notifications');
     }
   }
 
@@ -216,16 +217,16 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     notifyListeners();
 
     try {
-      print('Loading supplements from database...');
+      print('SupplementsLog: Loading supplements from database...');
       _supplements = await _databaseHelper.getAllSupplements();
-      print('Loaded ${_supplements.length} supplements');
+      print('SupplementsLog: Loaded ${_supplements.length} supplements');
       for (var supplement in _supplements) {
-        print('Supplement: ${supplement.name}');
+        print('SupplementsLog: Supplement: ${supplement.name}');
       }
     } catch (e) {
-      print('Error loading supplements: $e');
+      print('SupplementsLog: Error loading supplements: $e');
       if (kDebugMode) {
-        print('Error loading supplements: $e');
+        print('SupplementsLog: Error loading supplements: $e');
       }
     } finally {
       _isLoading = false;
@@ -235,28 +236,28 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
 
   Future<void> addSupplement(Supplement supplement) async {
     try {
-      print('Adding supplement: ${supplement.name}');
+      print('SupplementsLog: Adding supplement: ${supplement.name}');
       final id = await _databaseHelper.insertSupplement(supplement);
-      print('Supplement inserted with ID: $id');
+      print('SupplementsLog: Supplement inserted with ID: $id');
       final newSupplement = supplement.copyWith(id: id);
 
       // Schedule notifications (skip if there's an error)
       try {
         await _notificationService.scheduleSupplementReminders(newSupplement);
-        print('Notifications scheduled');
+        print('SupplementsLog: Notifications scheduled');
       } catch (notificationError) {
-        print('Warning: Could not schedule notifications: $notificationError');
+        print('SupplementsLog: Warning: Could not schedule notifications: $notificationError');
       }
 
       await loadSupplements();
-      print('Supplements reloaded, count: ${_supplements.length}');
+      print('SupplementsLog: Supplements reloaded, count: ${_supplements.length}');
 
       // Trigger sync after adding supplement
       _triggerSyncIfEnabled();
     } catch (e) {
-      print('Error adding supplement: $e');
+      print('SupplementsLog: Error adding supplement: $e');
       if (kDebugMode) {
-        print('Error adding supplement: $e');
+        print('SupplementsLog: Error adding supplement: $e');
       }
       rethrow;
     }
@@ -275,7 +276,29 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       _triggerSyncIfEnabled();
     } catch (e) {
       if (kDebugMode) {
-        print('Error updating supplement: $e');
+        print('SupplementsLog: Error updating supplement: $e');
+      }
+    }
+  }
+
+  Future<void> duplicateSupplement(int supplementId) async {
+    try {
+      final originalSupplement = await _databaseHelper.getSupplement(supplementId);
+      if (originalSupplement != null) {
+        final newSupplement = originalSupplement.copyWith(
+          setNullId: true, // This will be a new entry
+          newSyncId: true, // Generate a new syncId
+          name: '${originalSupplement.name} (Copy)',
+          createdAt: DateTime.now(),
+          lastModified: DateTime.now(),
+          syncStatus: RecordSyncStatus.pending,
+          isDeleted: false,
+        );
+        await addSupplement(newSupplement);
+      }
+    } catch (e) {
+      if (kDebugMode) {
+        print('SupplementsLog: Error duplicating supplement: $e');
       }
     }
   }
@@ -293,7 +316,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       _triggerSyncIfEnabled();
     } catch (e) {
       if (kDebugMode) {
-        print('Error deleting supplement: $e');
+        print('SupplementsLog: Error deleting supplement: $e');
       }
     }
   }
@@ -323,7 +346,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       );
     } catch (e) {
       if (kDebugMode) {
-        print('Error recording intake: $e');
+        print('SupplementsLog: Error recording intake: $e');
       }
     }
   }
@@ -332,22 +355,22 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     try {
       final today = DateTime.now();
       if (kDebugMode) {
-        print('Loading intakes for date: ${today.year}-${today.month}-${today.day}');
+        print('SupplementsLog: Loading intakes for date: ${today.year}-${today.month}-${today.day}');
       }
 
       _todayIntakes = await _databaseHelper.getIntakesWithSupplementsForDate(today);
 
       if (kDebugMode) {
-        print('Loaded ${_todayIntakes.length} intakes for today');
+        print('SupplementsLog: Loaded ${_todayIntakes.length} intakes for today');
         for (var intake in _todayIntakes) {
-          print('  - Supplement ID: ${intake['supplement_id']}, taken at: ${intake['takenAt']}');
+          print('SupplementsLog:   - Supplement ID: ${intake['supplement_id']}, taken at: ${intake['takenAt']}');
         }
       }
 
       notifyListeners();
     } catch (e) {
       if (kDebugMode) {
-        print('Error loading today\'s intakes: $e');
+        print('SupplementsLog: Error loading today\'s intakes: $e');
       }
     }
   }
@@ -358,7 +381,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       notifyListeners();
     } catch (e) {
       if (kDebugMode) {
-        print('Error loading monthly intakes: $e');
+        print('SupplementsLog: Error loading monthly intakes: $e');
       }
     }
   }
@@ -368,7 +391,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       return await _databaseHelper.getIntakesWithSupplementsForDate(date);
     } catch (e) {
       if (kDebugMode) {
-        print('Error loading intakes for date: $e');
+        print('SupplementsLog: Error loading intakes for date: $e');
       }
       return [];
     }
@@ -388,7 +411,26 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       _triggerSyncIfEnabled();
     } catch (e) {
       if (kDebugMode) {
-        print('Error deleting intake: $e');
+        print('SupplementsLog: Error deleting intake: $e');
+      }
+    }
+  }
+
+  Future<void> permanentlyDeleteIntake(int intakeId) async {
+    try {
+      await _databaseHelper.permanentlyDeleteIntake(intakeId);
+      await loadTodayIntakes();
+      // Also refresh monthly intakes if they're loaded
+      if (_monthlyIntakes.isNotEmpty) {
+        await loadMonthlyIntakes(DateTime.now().year, DateTime.now().month);
+      }
+      notifyListeners();
+
+      // Trigger sync after permanently deleting intake
+      _triggerSyncIfEnabled();
+    } catch (e) {
+      if (kDebugMode) {
+        print('SupplementsLog: Error permanently deleting intake: $e');
       }
     }
   }
@@ -401,10 +443,26 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     return _todayIntakes.where((intake) => intake['supplement_id'] == supplementId).length;
   }
 
+  Map<String, double> get dailyIngredientIntake {
+    final Map<String, double> ingredientIntake = {};
+
+    for (final intake in _todayIntakes) {
+      final supplement = _supplements.firstWhere((s) => s.id == intake['supplement_id']);
+      final unitsTaken = intake['unitsTaken'] as double;
+
+      for (final ingredient in supplement.ingredients) {
+        final currentAmount = ingredientIntake[ingredient.name] ?? 0;
+        ingredientIntake[ingredient.name] = currentAmount + (ingredient.amount * unitsTaken);
+      }
+    }
+
+    return ingredientIntake;
+  }
+
   // Method to manually refresh daily status (useful for testing or manual refresh)
   Future<void> refreshDailyStatus() async {
     if (kDebugMode) {
-      print('Manually refreshing daily status...');
+      print('SupplementsLog: Manually refreshing daily status...');
     }
     _lastDateCheck = DateTime.now();
     await loadTodayIntakes();
@@ -417,20 +475,20 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     final lastCheckDate = DateTime(_lastDateCheck.year, _lastDateCheck.month, _lastDateCheck.day);
 
     if (kDebugMode) {
-      print('Force checking date change...');
+      print('SupplementsLog: Force checking date change...');
-      print('Current date: $currentDate');
+      print('SupplementsLog: Current date: $currentDate');
-      print('Last check date: $lastCheckDate');
+      print('SupplementsLog: Last check date: $lastCheckDate');
     }
 
     if (currentDate != lastCheckDate) {
       if (kDebugMode) {
-        print('Date change detected, refreshing intakes...');
+        print('SupplementsLog: Date change detected, refreshing intakes...');
       }
       _lastDateCheck = now;
       await loadTodayIntakes();
     } else {
       if (kDebugMode) {
-        print('No date change detected');
+        print('SupplementsLog: No date change detected');
       }
     }
   }
@@ -445,7 +503,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       notifyListeners();
     } catch (e) {
       if (kDebugMode) {
-        print('Error loading archived supplements: $e');
+        print('SupplementsLog: Error loading archived supplements: $e');
       }
     }
   }
@@ -460,7 +518,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       _triggerSyncIfEnabled();
     } catch (e) {
       if (kDebugMode) {
-        print('Error archiving supplement: $e');
+        print('SupplementsLog: Error archiving supplement: $e');
       }
     }
   }
@@ -475,21 +533,21 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       _triggerSyncIfEnabled();
     } catch (e) {
       if (kDebugMode) {
-        print('Error unarchiving supplement: $e');
+        print('SupplementsLog: Error unarchiving supplement: $e');
       }
     }
   }
 
   Future<void> deleteArchivedSupplement(int supplementId) async {
     try {
-      await _databaseHelper.deleteSupplement(supplementId);
+      await _databaseHelper.permanentlyDeleteSupplement(supplementId);
       await loadArchivedSupplements(); // Refresh archived supplements
 
-      // Trigger sync after deleting archived supplement
+      // Trigger sync after permanently deleting archived supplement
       _triggerSyncIfEnabled();
     } catch (e) {
       if (kDebugMode) {
-        print('Error deleting archived supplement: $e');
+        print('SupplementsLog: Error permanently deleting archived supplement: $e');
       }
     }
   }

lib/providers/sync_provider.dart

@@ -1,417 +0,0 @@
-import 'package:flutter/foundation.dart';
-
-import '../models/sync_data.dart';
-import '../models/sync_enums.dart';
-import '../services/webdav_sync_service.dart';
-import 'supplement_provider.dart';
-
-/// Provider for managing sync operations with WebDAV servers
-class SyncProvider with ChangeNotifier {
-  final WebDAVSyncService _syncService = WebDAVSyncService();
-  final SupplementProvider _supplementProvider;
-
-  SyncOperationStatus _status = SyncOperationStatus.idle;
-  SyncResult? _lastSyncResult;
-  DateTime? _lastSyncTime;
-  String? _currentError;
-  bool _isAutoSyncEnabled = false;
-  bool _autoSyncOnDataChanges = true;
-  SyncFrequency _syncFrequency = SyncFrequency.hourly;
-  ConflictResolutionStrategy _conflictStrategy = ConflictResolutionStrategy.manual;
-  List<SyncConflict> _pendingConflicts = [];
-  double _syncProgress = 0.0;
-
-  // WebDAV Configuration
-  String? _serverUrl;
-  String? _username;
-  String? _detectedServerType;
-  String? _finalWebdavUrl;
-  String? _syncFolderName;
-  bool _isConfigured = false;
-
-  SyncProvider(this._supplementProvider);
-
-  // Getters
-  SyncOperationStatus get status => _status;
-  SyncResult? get lastSyncResult => _lastSyncResult;
-  DateTime? get lastSyncTime => _lastSyncTime;
-  String? get currentError => _currentError;
-  bool get isAutoSyncEnabled => _isAutoSyncEnabled;
-  bool get autoSyncOnDataChanges => _autoSyncOnDataChanges;
-  SyncFrequency get syncFrequency => _syncFrequency;
-  ConflictResolutionStrategy get conflictStrategy => _conflictStrategy;
-  List<SyncConflict> get pendingConflicts => List.unmodifiable(_pendingConflicts);
-  double get syncProgress => _syncProgress;
-  String? get serverUrl => _serverUrl;
-  String? get username => _username;
-  String? get detectedServerType => _detectedServerType;
-  String? get finalWebdavUrl => _finalWebdavUrl;
-  String? get syncFolderName => _syncFolderName;
-  bool get isConfigured => _isConfigured;
-  bool get isSyncing => _status == SyncOperationStatus.syncing;
-  bool get hasError => _currentError != null;
-  bool get hasPendingConflicts => _pendingConflicts.isNotEmpty;
-
-  /// Initialize the sync provider
-  Future<void> initialize() async {
-    await _syncService.initialize();
-    _isConfigured = await _syncService.isConfigured();
-    _lastSyncTime = await _syncService.getLastSyncTime();
-
-    if (_isConfigured) {
-      // Load existing configuration
-      _serverUrl = await _syncService.getServerUrl();
-      _username = await _syncService.getUsername();
-      _syncFolderName = await _syncService.getSyncFolderName();
-      _finalWebdavUrl = await _syncService.getLastWorkingUrl();
-      _detectedServerType = _detectServerTypeFromUrl(_finalWebdavUrl ?? _serverUrl ?? '');
-    }
-
-    // Set up data change callback on supplement provider
-    _supplementProvider.setOnDataChangedCallback(() {
-      triggerAutoSyncOnDataChange();
-    });
-
-    notifyListeners();
-  }
-
-  /// Configure WebDAV connection
-  Future<bool> configure({
-    required String serverUrl,
-    required String username,
-    String? password,
-    String? deviceName,
-    String? syncFolderName,
-  }) async {
-    try {
-      _setStatus(SyncOperationStatus.syncing);
-      _clearError();
-
-      final success = await _syncService.configure(
-        baseUrl: serverUrl,
-        username: username,
-        password: password,
-        deviceName: deviceName,
-        syncFolderName: syncFolderName ?? 'Supplements',
-      );
-
-      if (success) {
-        _serverUrl = serverUrl;
-        _username = username;
-        _syncFolderName = syncFolderName ?? 'Supplements';
-        _isConfigured = true;
-
-        // Get server detection info
-        _finalWebdavUrl = await _syncService.getLastWorkingUrl();
-        _detectedServerType = _detectServerTypeFromUrl(_finalWebdavUrl ?? serverUrl);
-
-        _setStatus(SyncOperationStatus.success);
-      } else {
-        _setError('Failed to configure WebDAV connection', SyncOperationStatus.authenticationError);
-      }
-
-      return success;
-    } catch (e) {
-      _setError(e.toString(), SyncOperationStatus.authenticationError);
-      return false;
-    }
-  }
-
-  /// Test WebDAV connection
-  Future<bool> testConnection() async {
-    if (!_isConfigured) return false;
-
-    try {
-      _clearError();
-      return await _syncService.testConnection();
-    } catch (e) {
-      _setError(e.toString(), SyncOperationStatus.networkError);
-      return false;
-    }
-  }
-
-  /// Clear WebDAV configuration
-  Future<void> clearConfiguration() async {
-    await _syncService.clearConfiguration();
-    _serverUrl = null;
-    _username = null;
-    _detectedServerType = null;
-    _finalWebdavUrl = null;
-    _syncFolderName = null;
-    _isConfigured = false;
-    _setStatus(SyncOperationStatus.idle);
-    _clearError();
-  }
-
-  /// Perform manual sync
-  Future<bool> performManualSync() async {
-    if (!_isConfigured || _status == SyncOperationStatus.syncing) {
-      return false;
-    }
-
-    try {
-      _setStatus(SyncOperationStatus.syncing);
-      _clearError();
-      _syncProgress = 0.0;
-
-      // Check connectivity first
-      if (!await _syncService.hasConnectivity()) {
-        _setError('No internet connection', SyncOperationStatus.networkError);
-        return false;
-      }
-
-      _syncProgress = 0.2;
-      notifyListeners();
-
-      // Perform the sync
-      final result = await _syncService.performSync();
-      _lastSyncResult = result;
-      _lastSyncTime = result.timestamp;
-
-      _syncProgress = 0.8;
-      notifyListeners();
-
-      if (result.success) {
-        if (result.conflicts.isNotEmpty) {
-          _pendingConflicts = result.conflicts;
-          _setStatus(SyncOperationStatus.conflictsDetected);
-        } else {
-          _setStatus(SyncOperationStatus.success);
-        }
-
-        // Reload local data after successful sync
-        await _supplementProvider.loadSupplements();
-        await _supplementProvider.loadTodayIntakes();
-      } else {
-        _setError(result.error ?? 'Sync failed', result.status);
-      }
-
-      _syncProgress = 1.0;
-      notifyListeners();
-
-      return result.success;
-    } catch (e) {
-      _setError(e.toString(), SyncOperationStatus.serverError);
-      return false;
-    }
-  }
-
-  /// Resolve a conflict
-  Future<void> resolveConflict(String syncId, ConflictResolution resolution) async {
-    _pendingConflicts.removeWhere((conflict) => conflict.syncId == syncId);
-
-    // TODO: Implement actual conflict resolution logic
-    // This would involve updating the local database with the chosen resolution
-
-    if (_pendingConflicts.isEmpty && _status == SyncOperationStatus.conflictsDetected) {
-      _setStatus(SyncOperationStatus.success);
-    }
-
-    notifyListeners();
-  }
-
-  /// Resolve all conflicts using the configured strategy
-  Future<void> resolveAllConflicts() async {
-    if (_conflictStrategy == ConflictResolutionStrategy.manual) {
-      return; // Manual conflicts need individual resolution
-    }
-
-    final resolvedConflicts = <SyncConflict>[];
-
-    for (final conflict in _pendingConflicts) {
-      ConflictResolution resolution;
-
-      switch (_conflictStrategy) {
-        case ConflictResolutionStrategy.preferLocal:
-          resolution = ConflictResolution.useLocal;
-          break;
-        case ConflictResolutionStrategy.preferRemote:
-          resolution = ConflictResolution.useRemote;
-          break;
-        case ConflictResolutionStrategy.preferNewer:
-          resolution = conflict.isLocalNewer
-            ? ConflictResolution.useLocal
-            : ConflictResolution.useRemote;
-          break;
-        case ConflictResolutionStrategy.manual:
-          continue; // Skip manual conflicts
-      }
-
-      await resolveConflict(conflict.syncId, resolution);
-      resolvedConflicts.add(conflict);
-    }
-
-    if (resolvedConflicts.isNotEmpty) {
-      // Perform another sync to apply resolutions
-      await performManualSync();
-    }
-  }
-
-  /// Enable or disable auto sync
-  Future<void> setAutoSyncEnabled(bool enabled) async {
-    _isAutoSyncEnabled = enabled;
-    notifyListeners();
-
-    if (enabled) {
-      _scheduleNextAutoSync();
-    }
-    // TODO: Cancel existing timers when disabled
-  }
-
-  /// Set sync frequency
-  Future<void> setSyncFrequency(SyncFrequency frequency) async {
-    _syncFrequency = frequency;
-    notifyListeners();
-
-    if (_isAutoSyncEnabled) {
-      _scheduleNextAutoSync();
-    }
-  }
-
-  /// Set conflict resolution strategy
-  Future<void> setConflictResolutionStrategy(ConflictResolutionStrategy strategy) async {
-    _conflictStrategy = strategy;
-    notifyListeners();
-  }
-
-  /// Enable or disable auto sync on data changes
-  Future<void> setAutoSyncOnDataChanges(bool enabled) async {
-    _autoSyncOnDataChanges = enabled;
-    notifyListeners();
-  }
-
-  /// Trigger sync automatically when data changes (if enabled)
-  Future<void> triggerAutoSyncOnDataChange() async {
-    if (!_autoSyncOnDataChanges || !_isConfigured || _status == SyncOperationStatus.syncing) {
-      return;
-    }
-
-    // Perform sync without blocking the UI
-    performManualSync();
-  }
-
-  /// Get sync statistics from last result
-  SyncStatistics? get lastSyncStatistics => _lastSyncResult?.statistics;
-
-  /// Get formatted last sync time
-  String get formattedLastSyncTime {
-    if (_lastSyncTime == null) return 'Never';
-
-    final now = DateTime.now();
-    final difference = now.difference(_lastSyncTime!);
-
-    if (difference.inMinutes < 1) {
-      return 'Just now';
-    } else if (difference.inMinutes < 60) {
-      return '${difference.inMinutes}m ago';
-    } else if (difference.inHours < 24) {
-      return '${difference.inHours}h ago';
-    } else {
-      return '${difference.inDays}d ago';
-    }
-  }
-
-  /// Get sync status message
-  String get statusMessage {
-    switch (_status) {
-      case SyncOperationStatus.idle:
-        return 'Ready to sync';
-      case SyncOperationStatus.syncing:
-        return 'Syncing... ${(_syncProgress * 100).round()}%';
-      case SyncOperationStatus.success:
-        return 'Sync completed successfully';
-      case SyncOperationStatus.networkError:
-        return 'Network connection failed';
-      case SyncOperationStatus.authenticationError:
-        return 'Authentication failed';
-      case SyncOperationStatus.serverError:
-        return 'Server error occurred';
-      case SyncOperationStatus.conflictsDetected:
-        return '${_pendingConflicts.length} conflict(s) need resolution';
-      case SyncOperationStatus.cancelled:
-        return 'Sync was cancelled';
-    }
-  }
-
-  /// Get device info
-  Future<Map<String, String?>> getDeviceInfo() async {
-    return await _syncService.getDeviceInfo();
-  }
-
-  // Private methods
-
-  void _setStatus(SyncOperationStatus status) {
-    _status = status;
-    notifyListeners();
-  }
-
-  void _setError(String error, SyncOperationStatus status) {
-    _currentError = error;
-    _status = status;
-    _syncProgress = 0.0;
-    notifyListeners();
-  }
-
-  void _clearError() {
-    _currentError = null;
-    notifyListeners();
-  }
-
-  void _scheduleNextAutoSync() {
-    if (!_isAutoSyncEnabled || _syncFrequency == SyncFrequency.manual) {
-      return;
-    }
-
-    // TODO: Implement actual scheduling logic using Timer or WorkManager
-    // This would schedule the next automatic sync based on the frequency
-    if (kDebugMode) {
-      print('Next auto sync scheduled for ${_syncFrequency.displayName}');
-    }
-  }
-
-  /// Detect server type from URL for display purposes
-  String _detectServerTypeFromUrl(String url) {
-    final lowerUrl = url.toLowerCase();
-
-    if (lowerUrl.contains('/remote.php/dav/files/')) {
-      return 'Nextcloud';
-    } else if (lowerUrl.contains('/remote.php/webdav/')) {
-      return 'ownCloud';
-    } else if (lowerUrl.contains('nextcloud')) {
-      return 'Nextcloud';
-    } else if (lowerUrl.contains('owncloud')) {
-      return 'ownCloud';
-    } else if (lowerUrl.contains('/webdav/') || lowerUrl.contains('/dav/')) {
-      return 'Generic WebDAV';
-    } else {
-      return 'WebDAV Server';
-    }
-  }
-
-  @override
-  void dispose() {
-    // TODO: Cancel any pending timers or background tasks
-    super.dispose();
-  }
-}
-
-/// Enum for conflict resolution choices
-enum ConflictResolution {
-  useLocal,
-  useRemote,
-  merge, // For future implementation
-}
-
-/// Extension methods for ConflictResolution
-extension ConflictResolutionExtension on ConflictResolution {
-  String get displayName {
-    switch (this) {
-      case ConflictResolution.useLocal:
-        return 'Use Local Version';
-      case ConflictResolution.useRemote:
-        return 'Use Remote Version';
-      case ConflictResolution.merge:
-        return 'Merge Changes';
-    }
-  }
-}

lib/screens/add_supplement_screen.dart

@@ -3,8 +3,10 @@ import 'package:provider/provider.dart';
 import 'package:uuid/uuid.dart';
 
 import '../models/ingredient.dart';
+import '../models/nutrient.dart';
 import '../models/supplement.dart';
 import '../providers/supplement_provider.dart';
+import '../services/nutrient_data_service.dart';
 
 // Helper class to manage ingredient text controllers
 class IngredientController {
@@ -51,6 +53,10 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
   final _numberOfUnitsController = TextEditingController();
   final _notesController = TextEditingController();
 
+  // Nutrient data for autocomplete
+  final NutrientDataService _nutrientDataService = NutrientDataService();
+  List<Nutrient> _nutrients = [];
+
   // Multi-ingredient support with persistent controllers
   List<IngredientController> _ingredientControllers = [];
 
@@ -224,6 +230,13 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
       appBar: AppBar(
         title: Text(isEditing ? 'Edit Supplement' : 'Add Supplement'),
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        actions: [
+          IconButton(
+            tooltip: isEditing ? 'Update Supplement' : 'Save Supplement',
+            onPressed: _saveSupplement,
+            icon: const Icon(Icons.save),
+          ),
+        ],
       ),
       body: Form(
         key: _formKey,
@@ -482,17 +495,7 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
               ),
               const SizedBox(height: 24),
 
-              // Save button
+              // Save is now in the AppBar for consistency with app-wide pattern
-              SizedBox(
-                width: double.infinity,
-                child: ElevatedButton(
-                  onPressed: _saveSupplement,
-                  style: ElevatedButton.styleFrom(
-                    padding: const EdgeInsets.all(16),
-                  ),
-                  child: Text(isEditing ? 'Update Supplement' : 'Add Supplement'),
-                ),
-              ),
             ],
           ),
         ),
@@ -560,21 +563,24 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
   void _saveSupplement() async {
     if (_formKey.currentState!.validate()) {
       // Validate that we have at least one ingredient with name and amount
-      final validIngredients = _ingredientControllers.where((controller) =>
+      final validIngredients = _ingredientControllers
-        controller.nameController.text.trim().isNotEmpty &&
+          .where((controller) =>
-        (double.tryParse(controller.amountController.text) ?? 0) > 0
+              controller.nameController.text.trim().isNotEmpty &&
-      ).map((controller) => Ingredient(
+              (double.tryParse(controller.amountController.text) ?? 0) > 0)
-        name: controller.nameController.text.trim(),
+          .map((controller) => Ingredient(
-        amount: double.tryParse(controller.amountController.text) ?? 0.0,
+                name: controller.nameController.text.trim(),
-        unit: controller.selectedUnit,
+                amount: double.tryParse(controller.amountController.text) ?? 0.0,
-        syncId: const Uuid().v4(),
+                unit: controller.selectedUnit,
-        lastModified: DateTime.now(),
+                syncId: const Uuid().v4(),
-      )).toList();
+                lastModified: DateTime.now(),
+              ))
+          .toList();
 
       if (validIngredients.isEmpty) {
         ScaffoldMessenger.of(context).showSnackBar(
           const SnackBar(
-            content: Text('Please add at least one ingredient with name and amount'),
+            content:
+                Text('Please add at least one ingredient with name and amount'),
           ),
         );
         return;
@@ -583,14 +589,20 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
       final supplement = Supplement(
         id: widget.supplement?.id,
         name: _nameController.text.trim(),
-        brand: _brandController.text.trim().isNotEmpty ? _brandController.text.trim() : null,
+        brand: _brandController.text.trim().isNotEmpty
+            ? _brandController.text.trim()
+            : null,
         ingredients: validIngredients,
         numberOfUnits: int.parse(_numberOfUnitsController.text),
         unitType: _selectedUnitType,
         frequencyPerDay: _frequencyPerDay,
         reminderTimes: _reminderTimes,
-        notes: _notesController.text.trim().isNotEmpty ? _notesController.text.trim() : null,
+        notes: _notesController.text.trim().isNotEmpty
+            ? _notesController.text.trim()
+            : null,
         createdAt: widget.supplement?.createdAt ?? DateTime.now(),
+        syncId: widget.supplement?.syncId, // Preserve syncId on update
+        lastModified: DateTime.now(), // Always update lastModified on save
       );
 
       final provider = context.read<SupplementProvider>();

lib/screens/archived_supplements_screen.dart

@@ -1,9 +1,9 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import 'package:supplements/widgets/info_chip.dart';
 
 import '../models/supplement.dart';
 import '../providers/supplement_provider.dart';
-import '../providers/sync_provider.dart';
 
 class ArchivedSupplementsScreen extends StatefulWidget {
   const ArchivedSupplementsScreen({super.key});
@@ -27,35 +27,9 @@ class _ArchivedSupplementsScreenState extends State<ArchivedSupplementsScreen> {
       appBar: AppBar(
         title: const Text('Archived Supplements'),
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
-        actions: [
-          Consumer<SyncProvider>(
-            builder: (context, syncProvider, child) {
-              if (!syncProvider.isConfigured) {
-                return const SizedBox.shrink();
-              }
-
-              return IconButton(
-                icon: syncProvider.isSyncing
-                    ? const SizedBox(
-                        width: 20,
-                        height: 20,
-                        child: CircularProgressIndicator(strokeWidth: 2),
-                      )
-                    : syncProvider.status.name == 'success' &&
-                      DateTime.now().difference(syncProvider.lastSyncTime ?? DateTime.now()).inSeconds < 5
-                        ? const Icon(Icons.check, color: Colors.green)
-                        : const Icon(Icons.sync),
-                onPressed: syncProvider.isSyncing ? null : () {
-                  syncProvider.performManualSync();
-                },
-                tooltip: syncProvider.isSyncing ? 'Syncing...' : 'Force Sync',
-              );
-            },
-          ),
-        ],
       ),
-      body: Consumer2<SupplementProvider, SyncProvider>(
+      body: Consumer<SupplementProvider>(
-        builder: (context, provider, syncProvider, child) {
+        builder: (context, provider, child) {
           if (provider.archivedSupplements.isEmpty) {
             return Center(
               child: Column(
@@ -333,13 +307,13 @@ class _ArchivedSupplementCard extends StatelessWidget {
               // Dosage info
               Row(
                 children: [
-                  _InfoChip(
+                  InfoChip(
                     icon: Icons.schedule,
                     label: '${supplement.frequencyPerDay}x daily',
                     context: context,
                   ),
                   const SizedBox(width: 8),
-                  _InfoChip(
+                  InfoChip(
                     icon: Icons.medication,
                     label: '${supplement.numberOfUnits} ${supplement.unitType}',
                     context: context,
@@ -349,7 +323,7 @@ class _ArchivedSupplementCard extends StatelessWidget {
 
               if (supplement.reminderTimes.isNotEmpty) ...[
                 const SizedBox(height: 8),
-                _InfoChip(
+                InfoChip(
                   icon: Icons.notifications_off,
                   label: 'Was: ${supplement.reminderTimes.join(', ')}',
                   context: context,
@@ -363,51 +337,3 @@ class _ArchivedSupplementCard extends StatelessWidget {
     );
   }
 }
-
-class _InfoChip extends StatelessWidget {
-  final IconData icon;
-  final String label;
-  final BuildContext context;
-  final bool fullWidth;
-
-  const _InfoChip({
-    required this.icon,
-    required this.label,
-    required this.context,
-    this.fullWidth = false,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      width: fullWidth ? double.infinity : null,
-      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
-      decoration: BoxDecoration(
-        color: Theme.of(context).colorScheme.surfaceVariant.withOpacity(0.4),
-        borderRadius: BorderRadius.circular(8),
-      ),
-      child: Row(
-        mainAxisSize: fullWidth ? MainAxisSize.max : MainAxisSize.min,
-        children: [
-          Icon(
-            icon,
-            size: 14,
-            color: Theme.of(context).colorScheme.outline,
-          ),
-          const SizedBox(width: 4),
-          Flexible(
-            child: Text(
-              label,
-              style: TextStyle(
-                fontSize: 11,
-                color: Theme.of(context).colorScheme.outline,
-                fontWeight: FontWeight.w500,
-              ),
-              overflow: TextOverflow.ellipsis,
-            ),
-          ),
-        ],
-      ),
-    );
-  }
-}

lib/screens/history_screen.dart

@@ -2,8 +2,8 @@ import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
 import 'package:provider/provider.dart';
 
+import '../providers/settings_provider.dart';
 import '../providers/supplement_provider.dart';
-import '../providers/sync_provider.dart';
 
 class HistoryScreen extends StatefulWidget {
   const HistoryScreen({super.key});
@@ -32,32 +32,6 @@ class _HistoryScreenState extends State<HistoryScreen> {
       appBar: AppBar(
         title: const Text('Intake History'),
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
-        actions: [
-          Consumer<SyncProvider>(
-            builder: (context, syncProvider, child) {
-              if (!syncProvider.isConfigured) {
-                return const SizedBox.shrink();
-              }
-
-              return IconButton(
-                icon: syncProvider.isSyncing
-                    ? const SizedBox(
-                        width: 20,
-                        height: 20,
-                        child: CircularProgressIndicator(strokeWidth: 2),
-                      )
-                    : syncProvider.status.name == 'success' &&
-                      DateTime.now().difference(syncProvider.lastSyncTime ?? DateTime.now()).inSeconds < 5
-                        ? const Icon(Icons.check, color: Colors.green)
-                        : const Icon(Icons.sync),
-                onPressed: syncProvider.isSyncing ? null : () {
-                  syncProvider.performManualSync();
-                },
-                tooltip: syncProvider.isSyncing ? 'Syncing...' : 'Force Sync',
-              );
-            },
-          ),
-        ],
       ),
       body: _buildCalendarView(),
     );
@@ -152,27 +126,33 @@ class _HistoryScreenState extends State<HistoryScreen> {
                         Expanded(
                           flex: 3,
                           child: Container(
-                            margin: const EdgeInsets.fromLTRB(0, 16, 16, 16),
+                            // add a bit more horizontal spacing between calendar and card
-                            child: _buildSelectedDayDetails(groupedIntakes),
+                            margin: const EdgeInsets.fromLTRB(8, 16, 16, 16),
+                            child: SingleChildScrollView(
+                              child: _buildSelectedDayDetails(groupedIntakes),
+                            ),
                           ),
                         ),
                       ],
                     );
                   } else {
                     // Mobile layout: vertical stack
-                    return Column(
+                    return SingleChildScrollView(
-                      children: [
+                      child: Column(
-                        // Calendar
+                        children: [
-                        Container(
+                          // Calendar
-                          margin: const EdgeInsets.symmetric(horizontal: 16),
+                          Container(
-                          child: _buildCalendar(groupedIntakes),
+                            margin: const EdgeInsets.symmetric(horizontal: 16),
-                        ),
+                            child: _buildCalendar(groupedIntakes),
-                        const SizedBox(height: 16),
+                          ),
-                        // Selected day details
+                          const SizedBox(height: 16),
-                        Expanded(
+                          // Selected day details
-                          child: _buildSelectedDayDetails(groupedIntakes),
+                          Container(
-                        ),
+                            margin: const EdgeInsets.symmetric(horizontal: 16),
-                      ],
+                            child: _buildSelectedDayDetails(groupedIntakes),
+                          ),
+                        ],
+                      ),
                     );
                   }
                 },
@@ -506,78 +486,208 @@ class _HistoryScreenState extends State<HistoryScreen> {
                   ],
                 ),
               ),
-              Expanded(
+              Padding(
-                child: ListView.builder(
+                padding: EdgeInsets.all(isWideScreen ? 20 : 16),
-                  padding: EdgeInsets.all(isWideScreen ? 20 : 16),
+                child: Builder(
-                  itemCount: dayIntakes.length,
+                  builder: (context) {
-                  itemBuilder: (context, index) {
+                    final settingsProvider = Provider.of<SettingsProvider>(context, listen: false);
-                    final intake = dayIntakes[index];
+                    // Sort once per render
-                    final takenAt = DateTime.parse(intake['takenAt']);
+                    final sortedDayIntakes = List<Map<String, dynamic>>.from(dayIntakes)
-                    final units = (intake['unitsTaken'] as num?)?.toDouble() ?? 1.0;
+                      ..sort((a, b) => DateTime.parse(a['takenAt']).compareTo(DateTime.parse(b['takenAt'])));
-
+                    // Helpers
-                    return Card(
+                    String timeCategory(DateTime dt) {
-                      margin: const EdgeInsets.only(bottom: 12),
+                      final h = dt.hour;
-                      elevation: 2,
+                      if (h >= settingsProvider.morningStart && h <= settingsProvider.morningEnd) return 'morning';
-                      child: Padding(
+                      if (h >= settingsProvider.afternoonStart && h <= settingsProvider.afternoonEnd) return 'afternoon';
-                        padding: EdgeInsets.all(isWideScreen ? 16 : 12),
+                      if (h >= settingsProvider.eveningStart && h <= settingsProvider.eveningEnd) return 'evening';
+                      final ns = settingsProvider.nightStart;
+                      final ne = settingsProvider.nightEnd;
+                      final inNight = ns <= ne ? (h >= ns && h <= ne) : (h >= ns || h <= ne);
+                      return inNight ? 'night' : 'anytime';
+                    }
+                    String? sectionRange(String cat) {
+                      switch (cat) {
+                        case 'morning':
+                          return settingsProvider.morningRange;
+                        case 'afternoon':
+                          return settingsProvider.afternoonRange;
+                        case 'evening':
+                          return settingsProvider.eveningRange;
+                        case 'night':
+                          return settingsProvider.nightRange;
+                        default:
+                          return null;
+                      }
+                    }
+                    Widget headerFor(String cat) {
+                      late final IconData icon;
+                      late final Color color;
+                      late final String title;
+                      switch (cat) {
+                        case 'morning':
+                          icon = Icons.wb_sunny;
+                          color = Colors.orange;
+                          title = 'Morning';
+                          break;
+                        case 'afternoon':
+                          icon = Icons.light_mode;
+                          color = Colors.blue;
+                          title = 'Afternoon';
+                          break;
+                        case 'evening':
+                          icon = Icons.nightlight_round;
+                          color = Colors.indigo;
+                          title = 'Evening';
+                          break;
+                        case 'night':
+                          icon = Icons.bedtime;
+                          color = Colors.purple;
+                          title = 'Night';
+                          break;
+                        default:
+                          icon = Icons.schedule;
+                          color = Colors.grey;
+                          title = 'Anytime';
+                      }
+                      final range = sectionRange(cat);
+                      return Container(
+                        margin: const EdgeInsets.only(bottom: 12),
+                        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+                        decoration: BoxDecoration(
+                          color: color.withOpacity(0.1),
+                          borderRadius: BorderRadius.circular(12),
+                          border: Border.all(
+                            color: color.withOpacity(0.3),
+                            width: 1,
+                          ),
+                        ),
                         child: Row(
                           children: [
-                            CircleAvatar(
+                            Container(
-                              backgroundColor: Theme.of(context).colorScheme.primary,
+                              padding: const EdgeInsets.all(8),
-                              radius: isWideScreen ? 24 : 20,
+                              decoration: BoxDecoration(
+                                color: color.withOpacity(0.2),
+                                shape: BoxShape.circle,
+                              ),
                               child: Icon(
-                                Icons.medication,
+                                icon,
-                                color: Theme.of(context).colorScheme.onPrimary,
+                                size: 20,
-                                size: isWideScreen ? 24 : 20,
+                                color: color,
                               ),
                             ),
-                            SizedBox(width: isWideScreen ? 16 : 12),
+                            const SizedBox(width: 12),
                             Expanded(
                               child: Column(
                                 crossAxisAlignment: CrossAxisAlignment.start,
                                 children: [
                                   Text(
-                                    intake['supplementName'],
+                                    title,
                                     style: TextStyle(
-                                      fontWeight: FontWeight.w600,
+                                      fontSize: 18,
-                                      fontSize: isWideScreen ? 16 : 14,
+                                      fontWeight: FontWeight.bold,
+                                      color: color,
                                     ),
                                   ),
-                                  const SizedBox(height: 4),
+                                  if (range != null) ...[
-                                  Text(
-                                    '${units.toStringAsFixed(units % 1 == 0 ? 0 : 1)} ${intake['supplementUnitType'] ?? 'units'} at ${DateFormat('HH:mm').format(takenAt)}',
-                                    style: TextStyle(
-                                      color: Theme.of(context).colorScheme.primary,
-                                      fontWeight: FontWeight.w500,
-                                      fontSize: isWideScreen ? 14 : 12,
-                                    ),
-                                  ),
-                                  if (intake['notes'] != null && intake['notes'].toString().isNotEmpty) ...[
-                                    const SizedBox(height: 4),
                                     Text(
-                                      intake['notes'],
+                                      '($range)',
                                       style: TextStyle(
-                                        fontSize: isWideScreen ? 13 : 12,
+                                        fontSize: 12,
-                                        fontStyle: FontStyle.italic,
+                                        fontWeight: FontWeight.w500,
-                                        color: Theme.of(context).colorScheme.onSurfaceVariant,
+                                        color: color.withOpacity(0.8),
                                       ),
                                     ),
                                   ],
                                 ],
                               ),
                             ),
-                            IconButton(
-                              icon: Icon(
-                                Icons.delete_outline,
-                                color: Colors.red.shade400,
-                                size: isWideScreen ? 24 : 20,
-                              ),
-                              onPressed: () => _deleteIntake(context, intake['id'], intake['supplementName']),
-                              tooltip: 'Delete intake',
-                            ),
                           ],
                         ),
-                      ),
+                      );
+                    }
+                    // Build a non-scrollable list so the card auto-expands to fit content
+                    final List<Widget> children = [];
+                    for (int index = 0; index < sortedDayIntakes.length; index++) {
+                      final intake = sortedDayIntakes[index];
+                      final takenAt = DateTime.parse(intake['takenAt']);
+                      final units = (intake['unitsTaken'] as num?)?.toDouble() ?? 1.0;
+                      final currentCategory = timeCategory(takenAt);
+                      final needsHeader = index == 0
+                          ? true
+                          : currentCategory != timeCategory(DateTime.parse(sortedDayIntakes[index - 1]['takenAt']));
+                      if (needsHeader) {
+                        children.add(headerFor(currentCategory));
+                      }
+                      children.add(
+                        Card(
+                          margin: const EdgeInsets.only(bottom: 12),
+                          elevation: 2,
+                          child: Padding(
+                            padding: EdgeInsets.all(isWideScreen ? 16 : 12),
+                            child: Row(
+                              children: [
+                                CircleAvatar(
+                                  backgroundColor: Theme.of(context).colorScheme.primary,
+                                  radius: isWideScreen ? 24 : 20,
+                                  child: Icon(
+                                    Icons.medication,
+                                    color: Theme.of(context).colorScheme.onPrimary,
+                                    size: isWideScreen ? 24 : 20,
+                                  ),
+                                ),
+                                SizedBox(width: isWideScreen ? 16 : 12),
+                                Expanded(
+                                  child: Column(
+                                    crossAxisAlignment: CrossAxisAlignment.start,
+                                    children: [
+                                      Text(
+                                        intake['supplementName'],
+                                        style: TextStyle(
+                                          fontWeight: FontWeight.w600,
+                                          fontSize: isWideScreen ? 16 : 14,
+                                        ),
+                                      ),
+                                      const SizedBox(height: 4),
+                                      Text(
+                                        '${units.toStringAsFixed(units % 1 == 0 ? 0 : 1)} ${intake['supplementUnitType'] ?? 'units'} at ${DateFormat('HH:mm').format(takenAt)}',
+                                        style: TextStyle(
+                                          color: Theme.of(context).colorScheme.primary,
+                                          fontWeight: FontWeight.w500,
+                                          fontSize: isWideScreen ? 14 : 12,
+                                        ),
+                                      ),
+                                      if (intake['notes'] != null && intake['notes'].toString().isNotEmpty) ...[
+                                        const SizedBox(height: 4),
+                                        Text(
+                                          intake['notes'],
+                                          style: TextStyle(
+                                            fontSize: isWideScreen ? 13 : 12,
+                                            fontStyle: FontStyle.italic,
+                                            color: Theme.of(context).colorScheme.onSurfaceVariant,
+                                          ),
+                                        ),
+                                      ],
+                                    ],
+                                  ),
+                                ),
+                                IconButton(
+                                  icon: Icon(
+                                    Icons.delete_outline,
+                                    color: Colors.red.shade400,
+                                    size: isWideScreen ? 24 : 20,
+                                  ),
+                                  onPressed: () => _deleteIntake(context, intake['id'], intake['supplementName']),
+                                  tooltip: 'Delete intake',
+                                ),
+                              ],
+                            ),
+                          ),
+                        ),
+                      );
+                    }
+                    return Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: children,
                     );
                   },
                 ),

lib/screens/home_screen.dart

@@ -51,20 +51,20 @@ class _HomeScreenState extends State<HomeScreen> {
     if (!mounted) return;
     
     try {
-      print('📱 === HOME SCREEN: Checking persistent reminders ===');
+      print('SupplementsLog: 📱 === HOME SCREEN: Checking persistent reminders ===');
       final supplementProvider = context.read<SupplementProvider>();
       final settingsProvider = context.read<SettingsProvider>();
       
-      print('📱 Settings: persistent=${settingsProvider.persistentReminders}, interval=${settingsProvider.reminderRetryInterval}, max=${settingsProvider.maxRetryAttempts}');
+      print('SupplementsLog: 📱 Settings: persistent=${settingsProvider.persistentReminders}, interval=${settingsProvider.reminderRetryInterval}, max=${settingsProvider.maxRetryAttempts}');
       
       await supplementProvider.checkPersistentRemindersWithSettings(
         persistentReminders: settingsProvider.persistentReminders,
         reminderRetryInterval: settingsProvider.reminderRetryInterval,
         maxRetryAttempts: settingsProvider.maxRetryAttempts,
       );
-      print('📱 === HOME SCREEN: Persistent reminder check complete ===');
+      print('SupplementsLog: 📱 === HOME SCREEN: Persistent reminder check complete ===');
     } catch (e) {
-      print('Error checking persistent reminders: $e');
+      print('SupplementsLog: Error checking persistent reminders: $e');
     }
   }
 

lib/screens/pending_notifications_screen.dart

@@ -132,7 +132,7 @@ class _PendingNotificationsScreenState extends State<PendingNotificationsScreen>
         _isLoading = false;
       });
     } catch (e) {
-      print('Error loading notifications: $e');
+      print('SupplementsLog: Error loading notifications: $e');
       setState(() {
         _isLoading = false;
       });

lib/screens/profile_setup_screen.dart

@@ -0,0 +1,129 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:supplements/screens/home_screen.dart';
+
+import '../providers/settings_provider.dart';
+
+// Profile setup screen
+class ProfileSetupScreen extends StatefulWidget {
+  const ProfileSetupScreen({super.key});
+
+  @override
+  State<ProfileSetupScreen> createState() => _ProfileSetupScreenState();
+}
+
+class _ProfileSetupScreenState extends State<ProfileSetupScreen> {
+  final _formKey = GlobalKey<FormState>();
+  DateTime? _dateOfBirth;
+  String? _gender;
+
+  final List<String> _genders = ['Male', 'Female', 'Other', 'Prefer not to say'];
+
+  @override
+  void initState() {
+    super.initState();
+    final settingsProvider = Provider.of<SettingsProvider>(context, listen: false);
+    _dateOfBirth = settingsProvider.dateOfBirth;
+    _gender = settingsProvider.gender;
+  }
+
+  void _saveProfile() {
+    if (_formKey.currentState!.validate()) {
+      _formKey.currentState!.save();
+      Provider.of<SettingsProvider>(context, listen: false).setDateOfBirthAndGender(_dateOfBirth!, _gender!);
+      Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (context) => HomeScreen()));
+    }
+  }
+
+  Future<void> _selectDate(BuildContext context) async {
+    final DateTime? picked = await showDatePicker(
+      context: context,
+      initialDate: _dateOfBirth ?? DateTime.now(),
+      firstDate: DateTime(1900),
+      lastDate: DateTime.now(),
+    );
+    if (picked != null && picked != _dateOfBirth) {
+      setState(() {
+        _dateOfBirth = picked;
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Set Up Your Profile'),
+      ),
+      body: Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Form(
+          key: _formKey,
+          child: Column(
+            children: [
+              Text(
+                'To provide you with personalized ingredient insights, please provide your date of birth and gender.',
+                style: Theme.of(context).textTheme.titleMedium,
+                textAlign: TextAlign.center,
+              ),
+              const SizedBox(height: 24),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Date of Birth',
+                  border: OutlineInputBorder(),
+                  suffixIcon: Icon(Icons.calendar_today),
+                ),
+                readOnly: true,
+                controller: TextEditingController(
+                  text: _dateOfBirth == null
+                      ? ''
+                      : '${_dateOfBirth!.toLocal()}'.split(' ')[0],
+                ),
+                onTap: () => _selectDate(context),
+                validator: (value) {
+                  if (_dateOfBirth == null) {
+                    return 'Please select your date of birth';
+                  }
+                  return null;
+                },
+              ),
+              const SizedBox(height: 16),
+              DropdownButtonFormField<String>(
+                decoration: const InputDecoration(
+                  labelText: 'Gender',
+                  border: OutlineInputBorder(),
+                ),
+                value: _gender,
+                items: _genders.map((String gender) {
+                  return DropdownMenuItem<String>(
+                    value: gender,
+                    child: Text(gender),
+                  );
+                }).toList(),
+                onChanged: (value) {
+                  setState(() {
+                    _gender = value;
+                  });
+                },
+                validator: (value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Please select your gender';
+                  }
+                  return null;
+                },
+                onSaved: (value) {
+                  _gender = value;
+                },
+              ),
+              const SizedBox(height: 24),
+              ElevatedButton(
+                onPressed: _saveProfile,
+                child: const Text('Save and Continue'),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}

lib/screens/settings_screen.dart

@@ -2,10 +2,9 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 import '../providers/settings_provider.dart';
-import '../providers/supplement_provider.dart';
-import '../services/notification_service.dart';
 import 'pending_notifications_screen.dart';
-import 'sync_settings_screen.dart';
+import 'profile_setup_screen.dart';
+import 'simple_sync_settings_screen.dart';
 
 class SettingsScreen extends StatelessWidget {
   const SettingsScreen({super.key});
@@ -21,6 +20,38 @@ class SettingsScreen extends StatelessWidget {
           return ListView(
             padding: const EdgeInsets.all(16.0),
             children: [
+              Card(
+                child: ListTile(
+                  leading: const Icon(Icons.person),
+                  title: const Text('Profile'),
+                  subtitle: Text('Date of Birth: ${settingsProvider.dateOfBirth != null ? '${settingsProvider.dateOfBirth!.toLocal()}'.split(' ')[0] : 'Not set'}, Gender: ${settingsProvider.gender ?? 'Not set'}'),
+                  trailing: const Icon(Icons.chevron_right),
+                  onTap: () {
+                    Navigator.of(context).push(
+                      MaterialPageRoute(
+                        builder: (context) => const ProfileSetupScreen(),
+                      ),
+                    );
+                  },
+                ),
+              ),
+              const SizedBox(height: 16),
+              Card(
+                child: ListTile(
+                  leading: const Icon(Icons.cloud_sync),
+                  title: const Text('Cloud Sync'),
+                  subtitle: const Text('Configure WebDAV sync settings'),
+                  trailing: const Icon(Icons.chevron_right),
+                  onTap: () {
+                    Navigator.of(context).push(
+                      MaterialPageRoute(
+                        builder: (context) => const SimpleSyncSettingsScreen(),
+                      ),
+                    );
+                  },
+                ),
+              ),
+              const SizedBox(height: 16),
               Card(
                 child: Padding(
                   padding: const EdgeInsets.all(16.0),
@@ -71,18 +102,98 @@ class SettingsScreen extends StatelessWidget {
               ),
               const SizedBox(height: 16),
               Card(
-                child: ListTile(
+                child: Padding(
-                  leading: const Icon(Icons.cloud_sync),
+                  padding: const EdgeInsets.all(16.0),
-                  title: const Text('Cloud Sync'),
+                  child: Column(
-                  subtitle: const Text('Configure WebDAV sync settings'),
+                    crossAxisAlignment: CrossAxisAlignment.start,
-                  trailing: const Icon(Icons.chevron_right),
+                    children: [
-                  onTap: () {
+                      Row(
-                    Navigator.of(context).push(
+                        children: [
-                      MaterialPageRoute(
+                          Icon(Icons.notifications_active, color: Colors.blue),
-                        builder: (context) => const SyncSettingsScreen(),
+                          const SizedBox(width: 8),
+                          Text(
+                            'Reminders',
+                            style: Theme.of(context).textTheme.titleMedium,
+                          ),
+                        ],
                       ),
-                    );
+                      const SizedBox(height: 8),
-                  },
+                      Text(
+                        'Configure reminders and how often they are retried when ignored',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: Theme.of(context).colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                      const SizedBox(height: 16),
+                      SwitchListTile(
+                        title: const Text('Enable Persistent Reminders'),
+                        subtitle: const Text('Resend notifications if ignored after a specific time'),
+                        value: settingsProvider.persistentReminders,
+                        onChanged: (value) {
+                          settingsProvider.setPersistentReminders(value);
+                        },
+                      ),
+                      if (settingsProvider.persistentReminders) ...[
+                        const SizedBox(height: 16),
+                        Text(
+                          'Retry Interval',
+                          style: Theme.of(context).textTheme.titleSmall,
+                        ),
+                        const SizedBox(height: 8),
+                        SegmentedButton<int>(
+                          segments: const [
+                            ButtonSegment(value: 5, label: Text('5 min')),
+                            ButtonSegment(value: 10, label: Text('10 min')),
+                            ButtonSegment(value: 15, label: Text('15 min')),
+                            ButtonSegment(value: 30, label: Text('30 min')),
+                          ],
+                          selected: {settingsProvider.reminderRetryInterval},
+                          onSelectionChanged: (values) {
+                            settingsProvider.setReminderRetryInterval(values.first);
+                          },
+                        ),
+                        const SizedBox(height: 16),
+                        Text(
+                          'Maximum Retry Attempts',
+                          style: Theme.of(context).textTheme.titleSmall,
+                        ),
+                        const SizedBox(height: 8),
+                        SegmentedButton<int>(
+                          segments: const [
+                            ButtonSegment(value: 1, label: Text('1')),
+                            ButtonSegment(value: 2, label: Text('2')),
+                            ButtonSegment(value: 3, label: Text('3')),
+                            ButtonSegment(value: 4, label: Text('4')),
+                            ButtonSegment(value: 5, label: Text('5')),
+                          ],
+                          selected: {settingsProvider.maxRetryAttempts},
+                          onSelectionChanged: (values) {
+                            settingsProvider.setMaxRetryAttempts(values.first);
+                          },
+                        ),
+                        const SizedBox(height: 16),
+                        Text(
+                          'Notification Actions',
+                          style: Theme.of(context).textTheme.titleSmall,
+                        ),
+                        const SizedBox(height: 8),
+                        SizedBox(
+                          width: 320,
+                          child: ElevatedButton.icon(
+                            onPressed: () {
+                              Navigator.of(context).push(
+                                MaterialPageRoute(
+                                  builder: (context) => const PendingNotificationsScreen(),
+                                ),
+                              );
+                            },
+                            icon: const Icon(Icons.list),
+                            label: const Text('View Pending Notifications'),
+                          ),
+                        ),
+                      ],
+                    ],
+                  ),
                 ),
               ),
               const SizedBox(height: 16),
@@ -155,354 +266,6 @@ class SettingsScreen extends StatelessWidget {
                   ),
                 ),
               ),
-              const SizedBox(height: 16),
-              Card(
-                child: Padding(
-                  padding: const EdgeInsets.all(16.0),
-                  child: Column(
-                    crossAxisAlignment: CrossAxisAlignment.start,
-                    children: [
-                      Row(
-                        children: [
-                          Icon(Icons.notifications_active, color: Colors.blue),
-                          const SizedBox(width: 8),
-                          Text(
-                            'Persistent Reminders',
-                            style: Theme.of(context).textTheme.titleMedium,
-                          ),
-                        ],
-                      ),
-                      const SizedBox(height: 8),
-                      Text(
-                        'Configure automatic reminder retries for ignored notifications',
-                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                          color: Theme.of(context).colorScheme.onSurfaceVariant,
-                        ),
-                      ),
-                      const SizedBox(height: 16),
-                      SwitchListTile(
-                        title: const Text('Enable Persistent Reminders'),
-                        subtitle: const Text('Resend notifications if ignored'),
-                        value: settingsProvider.persistentReminders,
-                        onChanged: (value) {
-                          settingsProvider.setPersistentReminders(value);
-                        },
-                      ),
-                      if (settingsProvider.persistentReminders) ...[
-                        const SizedBox(height: 16),
-                        Text(
-                          'Retry Interval',
-                          style: Theme.of(context).textTheme.titleSmall,
-                        ),
-                        const SizedBox(height: 8),
-                        SegmentedButton<int>(
-                          segments: const [
-                            ButtonSegment(value: 5, label: Text('5 min')),
-                            ButtonSegment(value: 10, label: Text('10 min')),
-                            ButtonSegment(value: 15, label: Text('15 min')),
-                            ButtonSegment(value: 30, label: Text('30 min')),
-                          ],
-                          selected: {settingsProvider.reminderRetryInterval},
-                          onSelectionChanged: (values) {
-                            settingsProvider.setReminderRetryInterval(values.first);
-                          },
-                        ),
-                        const SizedBox(height: 16),
-                        Text(
-                          'Maximum Retry Attempts',
-                          style: Theme.of(context).textTheme.titleSmall,
-                        ),
-                        const SizedBox(height: 8),
-                        SegmentedButton<int>(
-                          segments: const [
-                            ButtonSegment(value: 1, label: Text('1')),
-                            ButtonSegment(value: 2, label: Text('2')),
-                            ButtonSegment(value: 3, label: Text('3')),
-                            ButtonSegment(value: 4, label: Text('4')),
-                            ButtonSegment(value: 5, label: Text('5')),
-                          ],
-                          selected: {settingsProvider.maxRetryAttempts},
-                          onSelectionChanged: (values) {
-                            settingsProvider.setMaxRetryAttempts(values.first);
-                          },
-                        ),
-                      ],
-                    ],
-                  ),
-                ),
-              ),
-              const SizedBox(height: 16),
-              Card(
-                child: Padding(
-                  padding: const EdgeInsets.all(16.0),
-                  child: Column(
-                    crossAxisAlignment: CrossAxisAlignment.start,
-                    children: [
-                      Row(
-                        children: [
-                          const Icon(Icons.notifications_outlined),
-                          const SizedBox(width: 8),
-                          Text(
-                            'Notifications',
-                            style: Theme.of(context).textTheme.titleMedium,
-                          ),
-                        ],
-                      ),
-                      const SizedBox(height: 8),
-                      Text(
-                        'View and manage pending notifications',
-                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                          color: Theme.of(context).colorScheme.onSurfaceVariant,
-                        ),
-                      ),
-                      const SizedBox(height: 16),
-                      SizedBox(
-                        width: double.infinity,
-                        child: ElevatedButton.icon(
-                          onPressed: () {
-                            Navigator.of(context).push(
-                              MaterialPageRoute(
-                                builder: (context) => const PendingNotificationsScreen(),
-                              ),
-                            );
-                          },
-                          icon: const Icon(Icons.list),
-                          label: const Text('View Pending Notifications'),
-                        ),
-                      ),
-                    ],
-                  ),
-                ),
-              ),
-              const SizedBox(height: 16),
-              if (Theme.of(context).brightness == Brightness.dark) // Only show in debug mode for now
-                Card(
-                  child: Padding(
-                    padding: const EdgeInsets.all(16.0),
-                    child: Column(
-                      crossAxisAlignment: CrossAxisAlignment.start,
-                      children: [
-                        Row(
-                          children: [
-                            Icon(Icons.bug_report, color: Colors.orange),
-                            const SizedBox(width: 8),
-                            Text(
-                              'Debug - Notifications',
-                              style: Theme.of(context).textTheme.titleMedium,
-                            ),
-                          ],
-                        ),
-                        const SizedBox(height: 16),
-                        Consumer<SupplementProvider>(
-                          builder: (context, supplementProvider, child) {
-                            return Column(
-                              children: [
-                                ElevatedButton.icon(
-                                  onPressed: () async {
-                                    await supplementProvider.testNotifications();
-                                    if (context.mounted) {
-                                      ScaffoldMessenger.of(context).showSnackBar(
-                                        const SnackBar(content: Text('Test notification sent!')),
-                                      );
-                                    }
-                                  },
-                                  icon: const Icon(Icons.notifications_active),
-                                  label: const Text('Test Instant'),
-                                ),
-                                const SizedBox(height: 8),
-                                ElevatedButton.icon(
-                                  onPressed: () async {
-                                    await supplementProvider.testScheduledNotification();
-                                    if (context.mounted) {
-                                      ScaffoldMessenger.of(context).showSnackBar(
-                                        const SnackBar(content: Text('Scheduled test notification for 1 minute from now!')),
-                                      );
-                                    }
-                                  },
-                                  icon: const Icon(Icons.schedule),
-                                  label: const Text('Test Scheduled (1min)'),
-                                ),
-                                const SizedBox(height: 8),
-                                ElevatedButton.icon(
-                                  onPressed: () async {
-                                    await supplementProvider.testNotificationActions();
-                                    if (context.mounted) {
-                                      ScaffoldMessenger.of(context).showSnackBar(
-                                        const SnackBar(content: Text('Test notification with actions sent! Try the Take/Snooze buttons.')),
-                                      );
-                                    }
-                                  },
-                                  icon: const Icon(Icons.touch_app),
-                                  label: const Text('Test Actions'),
-                                ),
-                                const SizedBox(height: 8),
-                                ElevatedButton.icon(
-                                  onPressed: () async {
-                                    await NotificationService().testBasicNotification();
-                                    if (context.mounted) {
-                                      ScaffoldMessenger.of(context).showSnackBar(
-                                        const SnackBar(content: Text('Basic test notification sent! Tap it to test callback.')),
-                                      );
-                                    }
-                                  },
-                                  icon: const Icon(Icons.tap_and_play),
-                                  label: const Text('Test Basic Tap'),
-                                ),
-                                const SizedBox(height: 8),
-                                ElevatedButton.icon(
-                                  onPressed: () async {
-                                    await supplementProvider.rescheduleAllNotifications();
-                                    if (context.mounted) {
-                                      ScaffoldMessenger.of(context).showSnackBar(
-                                        const SnackBar(content: Text('All notifications rescheduled!')),
-                                      );
-                                    }
-                                  },
-                                  icon: const Icon(Icons.refresh),
-                                  label: const Text('Reschedule All'),
-                                ),
-                                const SizedBox(height: 8),
-                                ElevatedButton.icon(
-                                  onPressed: () async {
-                                    await supplementProvider.cancelAllNotifications();
-                                    if (context.mounted) {
-                                      ScaffoldMessenger.of(context).showSnackBar(
-                                        const SnackBar(content: Text('All notifications cancelled!')),
-                                      );
-                                    }
-                                  },
-                                  icon: const Icon(Icons.cancel),
-                                  label: const Text('Cancel All'),
-                                ),
-                                const SizedBox(height: 8),
-                                ElevatedButton.icon(
-                                  onPressed: () async {
-                                    final pending = await supplementProvider.getPendingNotifications();
-                                    if (context.mounted) {
-                                      showDialog(
-                                        context: context,
-                                        builder: (context) => AlertDialog(
-                                          title: const Text('Pending Notifications'),
-                                          content: pending.isEmpty
-                                            ? const Text('No pending notifications')
-                                            : SizedBox(
-                                                width: double.maxFinite,
-                                                child: Consumer<SupplementProvider>(
-                                                  builder: (context, provider, child) {
-                                                    return ListView.builder(
-                                                      shrinkWrap: true,
-                                                      itemCount: pending.length,
-                                                      itemBuilder: (context, index) {
-                                                        final notification = pending[index];
-
-                                                        // Calculate scheduled time inline
-                                                        String scheduledTime = '';
-                                                        try {
-                                                          final notificationId = notification.id;
-                                                          if (notificationId == 99999) {
-                                                            scheduledTime = 'Test notification';
-                                                          } else if (notificationId > 1000) {
-                                                            final snoozeMinutes = notificationId % 1000;
-                                                            scheduledTime = 'Snoozed ($snoozeMinutes min)';
-                                                          } else {
-                                                            final supplementId = notificationId ~/ 100;
-                                                            final reminderIndex = notificationId % 100;
-
-                                                            final supplement = provider.supplements.firstWhere(
-                                                              (s) => s.id == supplementId,
-                                                              orElse: () => provider.supplements.first,
-                                                            );
-
-                                                            if (reminderIndex < supplement.reminderTimes.length) {
-                                                              final reminderTime = supplement.reminderTimes[reminderIndex];
-                                                              final now = DateTime.now();
-                                                              final timeParts = reminderTime.split(':');
-                                                              final hour = int.parse(timeParts[0]);
-                                                              final minute = int.parse(timeParts[1]);
-
-                                                              final today = DateTime(now.year, now.month, now.day, hour, minute);
-                                                              final isToday = today.isAfter(now);
-
-                                                              scheduledTime = '${isToday ? 'Today' : 'Tomorrow'} at $reminderTime';
-                                                            } else {
-                                                              scheduledTime = 'Unknown time';
-                                                            }
-                                                          }
-                                                        } catch (e) {
-                                                          scheduledTime = 'ID: ${notification.id}';
-                                                        }
-
-                                                        return Card(
-                                                          margin: const EdgeInsets.symmetric(vertical: 4),
-                                                          child: ListTile(
-                                                            leading: CircleAvatar(
-                                                              backgroundColor: Theme.of(context).colorScheme.primary,
-                                                              child: Text(
-                                                                '${index + 1}',
-                                                                style: TextStyle(
-                                                                  color: Theme.of(context).colorScheme.onPrimary,
-                                                                  fontWeight: FontWeight.bold,
-                                                                ),
-                                                              ),
-                                                            ),
-                                                            title: Text(
-                                                              notification.title ?? 'No title',
-                                                              style: const TextStyle(fontWeight: FontWeight.w600),
-                                                            ),
-                                                            subtitle: Column(
-                                                              crossAxisAlignment: CrossAxisAlignment.start,
-                                                              children: [
-                                                                Text('ID: ${notification.id}'),
-                                                                Text(notification.body ?? 'No body'),
-                                                                if (scheduledTime.isNotEmpty) ...[
-                                                                  const SizedBox(height: 4),
-                                                                  Container(
-                                                                    padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
-                                                                    decoration: BoxDecoration(
-                                                                      color: Theme.of(context).colorScheme.primaryContainer,
-                                                                      borderRadius: BorderRadius.circular(12),
-                                                                    ),
-                                                                    child: Text(
-                                                                      '⏰ $scheduledTime',
-                                                                      style: TextStyle(
-                                                                        fontSize: 12,
-                                                                        fontWeight: FontWeight.w600,
-                                                                        color: Theme.of(context).colorScheme.onPrimaryContainer,
-                                                                      ),
-                                                                    ),
-                                                                  ),
-                                                                ],
-                                                              ],
-                                                            ),
-                                                            isThreeLine: true,
-                                                          ),
-                                                        );
-                                                      },
-                                                    );
-                                                  },
-                                                ),
-                                              ),
-                                          actions: [
-                                            TextButton(
-                                              onPressed: () => Navigator.of(context).pop(),
-                                              child: const Text('Close'),
-                                            ),
-                                          ],
-                                        ),
-                                      );
-                                    }
-                                  },
-                                  icon: const Icon(Icons.list),
-                                  label: const Text('Show Pending'),
-                                ),
-                              ],
-                            );
-                          },
-                        ),
-                      ],
-                    ),
-                  ),
-                ),
             ],
           );
         },

lib/screens/simple_sync_settings_screen.dart

@@ -0,0 +1,849 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+import '../providers/settings_provider.dart';
+import '../providers/simple_sync_provider.dart';
+import '../services/database_sync_service.dart';
+
+class SimpleSyncSettingsScreen extends StatefulWidget {
+  const SimpleSyncSettingsScreen({super.key});
+
+  @override
+  State<SimpleSyncSettingsScreen> createState() => _SimpleSyncSettingsScreenState();
+}
+
+class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
+  final _formKey = GlobalKey<FormState>();
+  final _serverUrlController = TextEditingController();
+  final _usernameController = TextEditingController();
+  final _passwordController = TextEditingController();
+  final _remotePathController = TextEditingController();
+
+  String _previewUrl = '';
+
+  @override
+  void initState() {
+    super.initState();
+    _serverUrlController.addListener(_updatePreviewUrl);
+    _usernameController.addListener(_updatePreviewUrl);
+    _loadSavedConfiguration();
+  }
+
+  void _loadSavedConfiguration() {
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      final syncProvider = context.read<SimpleSyncProvider>();
+
+      if (syncProvider.serverUrl != null) {
+        _serverUrlController.text = _extractHostnameFromUrl(syncProvider.serverUrl!);
+      }
+      if (syncProvider.username != null) {
+        _usernameController.text = syncProvider.username!;
+      }
+      if (syncProvider.password != null) {
+        _passwordController.text = syncProvider.password!;
+      }
+      if (syncProvider.remotePath != null) {
+        _remotePathController.text = syncProvider.remotePath!;
+      }
+
+      _updatePreviewUrl();
+    });
+  }
+
+  String _extractHostnameFromUrl(String fullUrl) {
+    try {
+      final uri = Uri.parse(fullUrl);
+      return uri.host;
+    } catch (e) {
+      return fullUrl; // Return as-is if parsing fails
+    }
+  }
+
+  void _updatePreviewUrl() {
+    setState(() {
+      if (_serverUrlController.text.isNotEmpty && _usernameController.text.isNotEmpty) {
+        _previewUrl = _constructWebDAVUrl(_serverUrlController.text, _usernameController.text);
+      } else {
+        _previewUrl = '';
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    _serverUrlController.removeListener(_updatePreviewUrl);
+    _usernameController.removeListener(_updatePreviewUrl);
+    _serverUrlController.dispose();
+    _usernameController.dispose();
+    _passwordController.dispose();
+    _remotePathController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final syncProvider = context.watch<SimpleSyncProvider>();
+
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Database Sync Settings'),
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        actions: [
+          IconButton(
+            tooltip: 'Save Configuration',
+            onPressed: syncProvider.isSyncing ? null : _configureSync,
+            icon: const Icon(Icons.save),
+          ),
+        ],
+      ),
+      body: SingleChildScrollView(
+        padding: const EdgeInsets.all(16.0),
+        child: Form(
+          key: _formKey,
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: [
+              _buildStatusCard(syncProvider),
+              const SizedBox(height: 20),
+              _buildConfigurationSection(syncProvider),
+              const SizedBox(height: 20),
+              _buildActionButtons(),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildStatusCard(SimpleSyncProvider syncProvider) {
+    IconData icon;
+    Color color;
+    String statusText = syncProvider.getStatusText();
+
+    switch (syncProvider.status) {
+      case SyncStatus.idle:
+        icon = syncProvider.isAutoSync ? Icons.sync_alt : Icons.sync;
+        color = Colors.blue;
+        break;
+      case SyncStatus.downloading:
+      case SyncStatus.merging:
+      case SyncStatus.uploading:
+        icon = syncProvider.isAutoSync ? Icons.sync_alt : Icons.sync;
+        color = syncProvider.isAutoSync ? Colors.deepOrange : Colors.orange;
+        break;
+      case SyncStatus.completed:
+        icon = syncProvider.isAutoSync ? Icons.check_circle_outline : Icons.check_circle;
+        color = Colors.green;
+        break;
+      case SyncStatus.error:
+        icon = Icons.error;
+        color = Colors.red;
+        break;
+    }
+
+    return Card(
+      child: Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Column(
+          children: [
+            Row(
+              children: [
+                Icon(icon, color: color, size: 24),
+                const SizedBox(width: 12),
+                Expanded(
+                  child: Text(
+                    statusText,
+                    style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                      color: color,
+                    ),
+                  ),
+                ),
+                // Sync action inside the status card
+                if (syncProvider.isSyncing) ...[
+                  const SizedBox(width: 12),
+                  SizedBox(
+                    width: 20,
+                    height: 20,
+                    child: CircularProgressIndicator(
+                      strokeWidth: 2.2,
+                      valueColor: AlwaysStoppedAnimation<Color>(color),
+                    ),
+                  ),
+                ] else ...[
+                  IconButton(
+                    tooltip: 'Sync Database',
+                    onPressed: (!syncProvider.isConfigured || syncProvider.isSyncing) ? null : _syncDatabase,
+                    icon: const Icon(Icons.sync),
+                    color: Theme.of(context).colorScheme.primary,
+                  ),
+                ],
+              ],
+            ),
+            _buildAutoSyncStatusIndicator(syncProvider),
+            if (syncProvider.lastSyncTime != null) ...[
+              const SizedBox(height: 8),
+              Text(
+                'Last sync: ${_formatDateTime(syncProvider.lastSyncTime!)}',
+                style: Theme.of(context).textTheme.bodySmall,
+              ),
+            ],
+            // Show auto-sync specific errors
+            if (syncProvider.isAutoSyncDisabledDueToErrors) ...[
+              const SizedBox(height: 8),
+              Container(
+                padding: const EdgeInsets.all(12),
+                decoration: BoxDecoration(
+                  color: Colors.red.withValues(alpha: 0.1),
+                  borderRadius: BorderRadius.circular(8),
+                  border: Border.all(color: Colors.red.withValues(alpha: 0.3)),
+                ),
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Row(
+                      children: [
+                        const Icon(Icons.warning, color: Colors.red, size: 20),
+                        const SizedBox(width: 8),
+                        Expanded(
+                          child: Text(
+                            'Auto-sync disabled due to repeated failures',
+                            style: Theme.of(context).textTheme.titleSmall?.copyWith(
+                              color: Colors.red,
+                              fontWeight: FontWeight.w600,
+                            ),
+                          ),
+                        ),
+                      ],
+                    ),
+                    if (syncProvider.autoSyncLastError != null) ...[
+                      const SizedBox(height: 8),
+                      Text(
+                        syncProvider.autoSyncLastError!,
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: Colors.red[700],
+                        ),
+                      ),
+                    ],
+                    const SizedBox(height: 12),
+                    Row(
+                      mainAxisAlignment: MainAxisAlignment.end,
+                      children: [
+                        TextButton.icon(
+                          onPressed: () => syncProvider.resetAutoSyncErrors(),
+                          icon: const Icon(Icons.refresh, size: 16),
+                          label: const Text('Reset & Re-enable'),
+                          style: TextButton.styleFrom(
+                            foregroundColor: Colors.red,
+                          ),
+                        ),
+                      ],
+                    ),
+                  ],
+                ),
+              ),
+            ] else if (syncProvider.lastError != null) ...[
+              const SizedBox(height: 8),
+              Container(
+                padding: const EdgeInsets.all(8),
+                decoration: BoxDecoration(
+                  color: Colors.red.withValues(alpha: 0.1),
+                  borderRadius: BorderRadius.circular(4),
+                ),
+                child: Row(
+                  children: [
+                    Expanded(
+                      child: Text(
+                        _getErrorMessage(syncProvider),
+                        style: const TextStyle(color: Colors.red),
+                      ),
+                    ),
+                    IconButton(
+                      icon: const Icon(Icons.close, color: Colors.red),
+                      onPressed: () => syncProvider.clearError(),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildConfigurationSection(SimpleSyncProvider syncProvider) {
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.stretch,
+      children: [
+        Card(
+          child: Padding(
+            padding: const EdgeInsets.all(12.0),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(
+                  'Sync Configuration',
+                  style: Theme.of(context).textTheme.titleLarge,
+                ),
+                const SizedBox(height: 8),
+                _buildAutoSyncSection(),
+              ],
+            ),
+          ),
+        ),
+        const SizedBox(height: 12),
+        Card(
+          child: Padding(
+            padding: const EdgeInsets.all(12.0),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(
+                  'WebDAV Settings',
+                  style: Theme.of(context).textTheme.titleMedium,
+                ),
+                const SizedBox(height: 8),
+                TextFormField(
+                  controller: _serverUrlController,
+                  decoration: const InputDecoration(
+                    labelText: 'Server URL',
+                    hintText: 'your-nextcloud.com',
+                    helperText: 'Enter just the hostname. We\'ll auto-detect the full WebDAV path.',
+                    border: OutlineInputBorder(),
+                  ),
+                  validator: (value) {
+                    if (value == null || value.isEmpty) {
+                      return 'Please enter a server URL';
+                    }
+                    return null;
+                  },
+                ),
+                const SizedBox(height: 8),
+                TextFormField(
+                  controller: _usernameController,
+                  decoration: const InputDecoration(
+                    labelText: 'Username',
+                    border: OutlineInputBorder(),
+                  ),
+                  validator: (value) {
+                    if (value == null || value.isEmpty) {
+                      return 'Please enter a username';
+                    }
+                    return null;
+                  },
+                ),
+                if (_previewUrl.isNotEmpty) ...[
+                  const SizedBox(height: 6),
+                  Container(
+                    padding: const EdgeInsets.all(8),
+                    decoration: BoxDecoration(
+                      color: Theme.of(context).colorScheme.surfaceContainerHighest.withValues(alpha: 0.3),
+                      borderRadius: BorderRadius.circular(8),
+                      border: Border.all(
+                        color: Theme.of(context).colorScheme.outline.withValues(alpha: 0.5),
+                      ),
+                    ),
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
+                        Text(
+                          'WebDAV URL Preview:',
+                          style: Theme.of(context).textTheme.labelMedium,
+                        ),
+                        const SizedBox(height: 4),
+                        SelectableText(
+                          _previewUrl,
+                          style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                            fontFamily: 'monospace',
+                            color: Theme.of(context).colorScheme.primary,
+                          ),
+                        ),
+                        const SizedBox(height: 6),
+                        Row(
+                          mainAxisAlignment: MainAxisAlignment.end,
+                          children: [
+                            ElevatedButton.icon(
+                              onPressed: syncProvider.isSyncing ? null : _testConnection,
+                              icon: const Icon(Icons.link),
+                              label: const Text('Test'),
+                              style: ElevatedButton.styleFrom(
+                                shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
+                                elevation: 0,
+                              ),
+                            ),
+                          ],
+                        ),
+                      ],
+                    ),
+                  ),
+                ],
+                const SizedBox(height: 8),
+                TextFormField(
+                  controller: _passwordController,
+                  decoration: const InputDecoration(
+                    labelText: 'Password',
+                    border: OutlineInputBorder(),
+                  ),
+                  obscureText: true,
+                  validator: (value) {
+                    if (value == null || value.isEmpty) {
+                      return 'Please enter a password';
+                    }
+                    return null;
+                  },
+                ),
+                const SizedBox(height: 8),
+                TextFormField(
+                  controller: _remotePathController,
+                  decoration: const InputDecoration(
+                    labelText: 'Remote Path (optional)',
+                    hintText: 'Supplements/',
+                    border: OutlineInputBorder(),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildActionButtons() {
+    // Buttons have been moved into the AppBar / cards. Keep a small spacer here for layout.
+    return const SizedBox.shrink();
+  }
+
+  Widget _buildAutoSyncSection() {
+    return Consumer<SettingsProvider>(
+      builder: (context, settingsProvider, child) {
+        return Consumer<SimpleSyncProvider>(
+          builder: (context, syncProvider, child) {
+        return Container(
+          padding: const EdgeInsets.all(16.0),
+          decoration: BoxDecoration(
+            color: Theme.of(context).colorScheme.surfaceContainerHighest.withValues(alpha: 0.3),
+            borderRadius: BorderRadius.circular(12),
+            border: Border.all(
+              color: Theme.of(context).colorScheme.outline.withValues(alpha: 0.5),
+            ),
+          ),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              SwitchListTile(
+                title: Row(
+                  children: [
+                    const Text(
+                      'Auto-sync',
+                      style: TextStyle(fontWeight: FontWeight.w600),
+                    ),
+                    const SizedBox(width: 8),
+                    _buildAutoSyncStatusBadge(settingsProvider, syncProvider),
+                  ],
+                ),
+                subtitle: Text(
+                  settingsProvider.autoSyncEnabled
+                      ? 'Automatically sync when you make changes'
+                      : 'Sync manually using the sync button',
+                  style: Theme.of(context).textTheme.bodySmall,
+                ),
+                value: settingsProvider.autoSyncEnabled,
+                onChanged: (bool value) async {
+                  await settingsProvider.setAutoSyncEnabled(value);
+                },
+                contentPadding: EdgeInsets.zero,
+              ),
+              if (settingsProvider.autoSyncEnabled) ...[
+                const SizedBox(height: 8),
+                Padding(
+                  padding: const EdgeInsets.only(left: 16.0),
+                  child: Text(
+                    'Changes are debounced for ${settingsProvider.autoSyncDebounceSeconds} seconds to prevent excessive syncing.',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: Theme.of(context).colorScheme.onSurfaceVariant,
+                      fontStyle: FontStyle.italic,
+                    ),
+                  ),
+                ),
+                const SizedBox(height: 12),
+                Padding(
+                  padding: const EdgeInsets.only(left: 16.0),
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        'Debounce timeout',
+                        style: Theme.of(context).textTheme.titleSmall,
+                      ),
+                      const SizedBox(height: 8),
+                      SegmentedButton<int>(
+                        segments: const [
+                          ButtonSegment(value: 1, label: Text('1s')),
+                          ButtonSegment(value: 5, label: Text('5s')),
+                          ButtonSegment(value: 15, label: Text('15s')),
+                          ButtonSegment(value: 30, label: Text('30s')),
+                        ],
+                        selected: {settingsProvider.autoSyncDebounceSeconds},
+                        onSelectionChanged: (values) {
+                          settingsProvider.setAutoSyncDebounceSeconds(values.first);
+                        },
+                      ),
+                    ],
+                  ),
+                ),
+              ],
+              const SizedBox(height: 12),
+              Container(
+                padding: const EdgeInsets.all(12),
+                decoration: BoxDecoration(
+                  color: Theme.of(context).colorScheme.primaryContainer.withValues(alpha: 0.3),
+                  borderRadius: BorderRadius.circular(8),
+                ),
+                child: Row(
+                  children: [
+                    Icon(
+                      Icons.info_outline,
+                      size: 16,
+                      color: Theme.of(context).colorScheme.primary,
+                    ),
+                    const SizedBox(width: 8),
+                    Expanded(
+                      child: Text(
+                        'Auto-sync triggers when you add, update, or delete supplements and intakes. Configure your WebDAV settings below to enable syncing.',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: Theme.of(context).colorScheme.onPrimaryContainer,
+                        ),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        );
+          },
+        );
+      },
+    );
+  }
+
+  Future<void> _testConnection() async {
+    if (!_formKey.currentState!.validate()) return;
+
+    final syncProvider = context.read<SimpleSyncProvider>();
+
+    try {
+      // Construct the full WebDAV URL from the simple hostname
+      final fullWebDAVUrl = _constructWebDAVUrl(
+        _serverUrlController.text.trim(),
+        _usernameController.text.trim(),
+      );
+
+      // Configure temporarily for testing
+      await syncProvider.configure(
+        serverUrl: fullWebDAVUrl,
+        username: _usernameController.text.trim(),
+        password: _passwordController.text.trim(),
+        remotePath: _remotePathController.text.trim().isEmpty
+            ? 'Supplements'
+            : _remotePathController.text.trim(),
+      );
+
+      final success = await syncProvider.testConnection();
+
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text(success
+                ? 'Connection successful!'
+                : 'Connection failed. Check your settings.'),
+            backgroundColor: success ? Colors.green : Colors.red,
+          ),
+        );
+      }
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text('Connection test failed: $e'),
+            backgroundColor: Colors.red,
+          ),
+        );
+      }
+    }
+  }
+
+  Future<void> _configureSync() async {
+    if (!_formKey.currentState!.validate()) return;
+
+    final syncProvider = context.read<SimpleSyncProvider>();
+
+    try {
+      // Construct the full WebDAV URL from the simple hostname
+      final fullWebDAVUrl = _constructWebDAVUrl(
+        _serverUrlController.text.trim(),
+        _usernameController.text.trim(),
+      );
+
+      await syncProvider.configure(
+        serverUrl: fullWebDAVUrl,
+        username: _usernameController.text.trim(),
+        password: _passwordController.text.trim(),
+        remotePath: _remotePathController.text.trim().isEmpty
+            ? 'Supplements'
+            : _remotePathController.text.trim(),
+      );
+
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(
+            content: Text('Configuration saved successfully!'),
+            backgroundColor: Colors.green,
+          ),
+        );
+      }
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text('Failed to save configuration: $e'),
+            backgroundColor: Colors.red,
+          ),
+        );
+      }
+    }
+  }
+
+  Future<void> _syncDatabase() async {
+    final syncProvider = context.read<SimpleSyncProvider>();
+
+    try {
+      await syncProvider.syncDatabase(isAutoSync: false);
+
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(
+            content: Text('Manual sync completed!'),
+            backgroundColor: Colors.green,
+          ),
+        );
+      }
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text('Manual sync failed: $e'),
+            backgroundColor: Colors.red,
+          ),
+        );
+      }
+    }
+  }
+
+  String _constructWebDAVUrl(String serverUrl, String username) {
+    // Remove any protocol prefix if present
+    String cleanUrl = serverUrl.trim();
+    if (cleanUrl.startsWith('http://')) {
+      cleanUrl = cleanUrl.substring(7);
+    } else if (cleanUrl.startsWith('https://')) {
+      cleanUrl = cleanUrl.substring(8);
+    }
+
+    // Remove trailing slash if present
+    if (cleanUrl.endsWith('/')) {
+      cleanUrl = cleanUrl.substring(0, cleanUrl.length - 1);
+    }
+
+    // For Nextcloud instances, construct the standard WebDAV path
+    // Default to HTTPS for security
+    return 'https://$cleanUrl/remote.php/dav/files/$username/';
+  }
+
+  Widget _buildAutoSyncStatusIndicator(SimpleSyncProvider syncProvider) {
+    return Consumer<SettingsProvider>(
+      builder: (context, settingsProvider, child) {
+        // Only show auto-sync status if auto-sync is enabled
+        if (!settingsProvider.autoSyncEnabled) {
+          return const SizedBox.shrink();
+        }
+
+        // Check if auto-sync service has pending sync
+        final autoSyncService = syncProvider.autoSyncService;
+        if (autoSyncService == null) {
+          return const SizedBox.shrink();
+        }
+
+        // Show pending auto-sync indicator
+        if (autoSyncService.hasPendingSync && !syncProvider.isSyncing) {
+          return Container(
+            margin: const EdgeInsets.only(top: 8),
+            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+            decoration: BoxDecoration(
+              color: Colors.blue.withValues(alpha: 0.1),
+              borderRadius: BorderRadius.circular(16),
+              border: Border.all(color: Colors.blue.withValues(alpha: 0.3)),
+            ),
+            child: Row(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                SizedBox(
+                  width: 12,
+                  height: 12,
+                  child: CircularProgressIndicator(
+                    strokeWidth: 1.5,
+                    valueColor: const AlwaysStoppedAnimation<Color>(Colors.blue),
+                  ),
+                ),
+                const SizedBox(width: 8),
+                Text(
+                  'Auto-sync pending...',
+                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: Colors.blue,
+                    fontWeight: FontWeight.w500,
+                  ),
+                ),
+              ],
+            ),
+          );
+        }
+
+        // Show auto-sync active indicator (when sync is running and it's auto-triggered)
+        if (syncProvider.isSyncing && syncProvider.isAutoSync) {
+          return Container(
+            margin: const EdgeInsets.only(top: 8),
+            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+            decoration: BoxDecoration(
+              color: Colors.deepOrange.withValues(alpha: 0.1),
+              borderRadius: BorderRadius.circular(16),
+              border: Border.all(color: Colors.deepOrange.withValues(alpha: 0.3)),
+            ),
+            child: Row(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                Icon(
+                  Icons.sync_alt,
+                  size: 12,
+                  color: Colors.deepOrange,
+                ),
+                const SizedBox(width: 8),
+                Text(
+                  'Auto-sync active',
+                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: Colors.deepOrange,
+                    fontWeight: FontWeight.w500,
+                  ),
+                ),
+              ],
+            ),
+          );
+        }
+
+        return const SizedBox.shrink();
+      },
+    );
+  }
+
+  Widget _buildAutoSyncStatusBadge(SettingsProvider settingsProvider, SimpleSyncProvider syncProvider) {
+    if (!settingsProvider.autoSyncEnabled) {
+      return Container(
+        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+        decoration: BoxDecoration(
+          color: Colors.grey.withValues(alpha: 0.2),
+          borderRadius: BorderRadius.circular(8),
+        ),
+        child: Text(
+          'OFF',
+          style: Theme.of(context).textTheme.labelSmall?.copyWith(
+            color: Colors.grey[600],
+            fontWeight: FontWeight.w600,
+          ),
+        ),
+      );
+    }
+
+    // Check if auto-sync is disabled due to errors
+    if (syncProvider.isAutoSyncDisabledDueToErrors) {
+      return Container(
+        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+        decoration: BoxDecoration(
+          color: Colors.red.withValues(alpha: 0.2),
+          borderRadius: BorderRadius.circular(8),
+        ),
+        child: Text(
+          'ERROR',
+          style: Theme.of(context).textTheme.labelSmall?.copyWith(
+            color: Colors.red[700],
+            fontWeight: FontWeight.w600,
+          ),
+        ),
+      );
+    }
+
+    // Check if sync is configured
+    if (!syncProvider.isConfigured) {
+      return Container(
+        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+        decoration: BoxDecoration(
+          color: Colors.orange.withValues(alpha: 0.2),
+          borderRadius: BorderRadius.circular(8),
+        ),
+        child: Text(
+          'NOT CONFIGURED',
+          style: Theme.of(context).textTheme.labelSmall?.copyWith(
+            color: Colors.orange[700],
+            fontWeight: FontWeight.w600,
+          ),
+        ),
+      );
+    }
+
+    // Check if there are recent failures but not disabled yet
+    if (syncProvider.autoSyncConsecutiveFailures > 0) {
+      return Container(
+        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+        decoration: BoxDecoration(
+          color: Colors.orange.withValues(alpha: 0.2),
+          borderRadius: BorderRadius.circular(8),
+        ),
+        child: Text(
+          'RETRYING',
+          style: Theme.of(context).textTheme.labelSmall?.copyWith(
+            color: Colors.orange[700],
+            fontWeight: FontWeight.w600,
+          ),
+        ),
+      );
+    }
+
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+      decoration: BoxDecoration(
+        color: Colors.green.withValues(alpha: 0.2),
+        borderRadius: BorderRadius.circular(8),
+      ),
+      child: Text(
+        'ACTIVE',
+        style: Theme.of(context).textTheme.labelSmall?.copyWith(
+          color: Colors.green[700],
+          fontWeight: FontWeight.w600,
+        ),
+      ),
+    );
+  }
+
+  String _getErrorMessage(SimpleSyncProvider syncProvider) {
+    final error = syncProvider.lastError ?? 'Unknown error';
+
+    // Add context for auto-sync errors
+    if (syncProvider.isAutoSync) {
+      return 'Auto-sync error: $error';
+    }
+
+    return error;
+  }
+
+  String _formatDateTime(DateTime dateTime) {
+    return '${dateTime.day}/${dateTime.month}/${dateTime.year} ${dateTime.hour}:${dateTime.minute.toString().padLeft(2, '0')}';
+  }
+}

lib/screens/supplements_list_screen.dart

@@ -1,10 +1,15 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import 'package:supplements/widgets/info_chip.dart';
+import 'package:url_launcher/url_launcher.dart';
 
+import '../models/ingredient.dart';
 import '../models/supplement.dart';
 import '../providers/settings_provider.dart';
+import '../providers/simple_sync_provider.dart';
 import '../providers/supplement_provider.dart';
-import '../providers/sync_provider.dart';
+import '../services/database_sync_service.dart';
+import '../services/rda_service.dart';
 import '../widgets/supplement_card.dart';
 import 'add_supplement_screen.dart';
 import 'archived_supplements_screen.dart';
@@ -19,7 +24,7 @@ class SupplementsListScreen extends StatelessWidget {
         title: const Text('My Supplements'),
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
         actions: [
-          Consumer<SyncProvider>(
+          Consumer<SimpleSyncProvider>(
             builder: (context, syncProvider, child) {
               if (!syncProvider.isConfigured) {
                 return const SizedBox.shrink();
@@ -32,12 +37,13 @@ class SupplementsListScreen extends StatelessWidget {
                         height: 20,
                         child: CircularProgressIndicator(strokeWidth: 2),
                       )
-                    : syncProvider.status.name == 'success' &&
+                    : syncProvider.status == SyncStatus.completed &&
-                      DateTime.now().difference(syncProvider.lastSyncTime ?? DateTime.now()).inSeconds < 5
+                      syncProvider.lastSyncTime != null &&
+                      DateTime.now().difference(syncProvider.lastSyncTime!).inSeconds < 5
                         ? const Icon(Icons.check, color: Colors.green)
                         : const Icon(Icons.sync),
                 onPressed: syncProvider.isSyncing ? null : () {
-                  syncProvider.performManualSync();
+                  syncProvider.syncDatabase();
                 },
                 tooltip: syncProvider.isSyncing ? 'Syncing...' : 'Force Sync',
               );
@@ -56,8 +62,8 @@ class SupplementsListScreen extends StatelessWidget {
           ),
         ],
       ),
-      body: Consumer3<SupplementProvider, SettingsProvider, SyncProvider>(
+      body: Consumer2<SupplementProvider, SettingsProvider>(
-        builder: (context, provider, settingsProvider, syncProvider, child) {
+        builder: (context, provider, settingsProvider, child) {
           if (provider.isLoading) {
             return const Center(child: CircularProgressIndicator());
           }
@@ -105,11 +111,162 @@ class SupplementsListScreen extends StatelessWidget {
   }
 
   Widget _buildGroupedSupplementsList(BuildContext context, List<Supplement> supplements, SettingsProvider settingsProvider) {
+    final provider = Provider.of<SupplementProvider>(context, listen: false);
     final groupedSupplements = _groupSupplementsByTimeOfDay(supplements, settingsProvider);
 
     return ListView(
       padding: const EdgeInsets.all(16),
       children: [
+        // Daily RDA overview header
+        FutureBuilder<Map<String, Map<String, dynamic>>>(
+          future: (() async {
+            if (provider.todayIntakes.isEmpty) return <String, Map<String, dynamic>>{};
+            final dailyItems = <Ingredient>[];
+            for (final intake in provider.todayIntakes) {
+              final supId = intake['supplement_id'] as int;
+              final unitsRaw = intake['unitsTaken'];
+              final double units = unitsRaw is int ? unitsRaw.toDouble() : (unitsRaw as double? ?? 1.0);
+              final matching = provider.supplements.where((s) => s.id == supId);
+              if (matching.isEmpty) continue;
+              final sup = matching.first;
+              for (final ing in sup.ingredients) {
+                dailyItems.add(ing.copyWith(amount: ing.amount * units));
+              }
+            }
+            if (dailyItems.isEmpty) return <String, Map<String, dynamic>>{};
+            final service = RdaService();
+            final agg = await service.aggregateDailyIntake(
+              dailyItems,
+              dateOfBirth: settingsProvider.dateOfBirth,
+              gender: settingsProvider.gender,
+            );
+            // Convert to plain map for UI without depending on service types
+            final result = <String, Map<String, dynamic>>{};
+            agg.forEach((key, value) {
+              final v = value; // dynamic
+              result[key] = {
+                'unitLabel': v.unitLabel,
+                'rdaValue': v.rdaValue,
+                'rdaValueMin': v.rdaValueMin,
+                'rdaValueMax': v.rdaValueMax,
+                'ulValue': v.ulValue,
+                'total': v.totalAmountInRdaUnit,
+                'pctRda': v.percentOfRda,
+                'pctUl': v.percentOfUl,
+                'lifeStage': v.matchedLifeStageLabel,
+                'lifeStageDescription': v.matchedLifeStageDescription,
+                'rdaType': v.rdaType,
+                'note': v.note,
+                'nutrientUl': v.nutrientUl != null
+                    ? {
+                        'value': v.nutrientUl!.value,
+                        'unit': v.nutrientUl!.unit,
+                        'duration': v.nutrientUl!.duration,
+                        'note': v.nutrientUl!.note,
+                      }
+                    : null,
+              };
+            });
+            return result;
+          })(),
+          builder: (context, snapshot) {
+            if (snapshot.connectionState != ConnectionState.done) {
+              return const SizedBox.shrink();
+            }
+            final data = snapshot.data;
+            if (data == null || data.isEmpty) {
+              return const SizedBox.shrink();
+            }
+            return Card(
+              margin: const EdgeInsets.only(bottom: 16),
+              color: Theme.of(context).colorScheme.primaryContainer.withOpacity(0.25),
+              child: Padding(
+                padding: const EdgeInsets.all(12),
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Row(
+                      children: [
+                        Icon(Icons.health_and_safety, size: 18, color: Theme.of(context).colorScheme.primary),
+                        const SizedBox(width: 8),
+                        Text(
+                          "Today's intake ",
+                          style: Theme.of(context).textTheme.titleSmall,
+                        ),
+                        Text(
+                          "(Vs Recommended Dietary Allowance)",
+                          style: Theme.of(context).textTheme.labelSmall,
+                        ),
+                        const Spacer(),
+                        IconButton(
+                          tooltip: 'Sources & disclaimer',
+                          icon: const Icon(Icons.info_outline, size: 18),
+                          onPressed: () => _showRdaSourcesSheet(context),
+                        ),
+                      ],
+                    ),
+                    const SizedBox(height: 8),
+                    Wrap(
+                      spacing: 8,
+                      runSpacing: 8,
+                      children: data.entries.map((e) {
+                        final v = e.value;
+                        final double pct = (v['pctRda'] as double?) ?? 0.0;
+                        final double? pctUl = v['pctUl'] as double?;
+                        final pretty = e.key.split('_').map((w) => w.isEmpty ? w : '${w[0].toUpperCase()}${w.substring(1)}').join(' ');
+                        Color bg = Theme.of(context).colorScheme.surfaceVariant.withOpacity(0.5);
+                        if (pctUl != null && pctUl > 100.0) {
+                          bg = (pctUl <= 110.0) ? Colors.amber.withOpacity(0.25) : Colors.red.withOpacity(0.25);
+                        } else if (pct >= 100.0) {
+                          bg = Colors.green.withOpacity(0.25);
+                        }
+                        final color = Theme.of(context).colorScheme.onSurfaceVariant;
+                        return InkWell(
+                          onTap: () {
+                            _showRdaDetailsSheet(context, pretty, v);
+                          },
+                          borderRadius: BorderRadius.circular(8),
+                          child: Container(
+                            padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 6),
+                            decoration: BoxDecoration(
+                              color: bg,
+                              borderRadius: BorderRadius.circular(8),
+                              border: Border.all(color: Theme.of(context).colorScheme.outline.withOpacity(0.3)),
+                            ),
+                            child: Row(
+                              mainAxisSize: MainAxisSize.min,
+                              children: [
+                                Text(
+                                  pretty,
+                                  style: TextStyle(fontSize: 12, fontWeight: FontWeight.w600, color: color),
+                                ),
+                                const SizedBox(width: 6),
+                                Text(
+                                  '${pct.toStringAsFixed(pct >= 10 ? 0 : 1)}%',
+                                  style: TextStyle(fontSize: 12, color: color),
+                                ),
+                                if (pctUl != null) ...[
+                                  const SizedBox(width: 6),
+                                  Icon(
+                                    pctUl > 100.0 ? Icons.warning_amber : Icons.shield_outlined,
+                                    size: 14,
+                                    color: pctUl > 100.0
+                                        ? (pctUl <= 110.0 ? Colors.amber : Colors.red)
+                                        : color,
+                                  ),
+                                ],
+                              ],
+                            ),
+                          ),
+                        );
+                      }).toList(),
+                    ),
+                  ],
+                ),
+              ),
+            );
+          },
+        ),
         if (groupedSupplements['morning']!.isNotEmpty) ...[
           _buildSectionHeader('Morning (${settingsProvider.morningRange})', Icons.wb_sunny, Colors.orange, groupedSupplements['morning']!.length),
           ...groupedSupplements['morning']!.map((supplement) =>
@@ -119,6 +276,7 @@ class SupplementsListScreen extends StatelessWidget {
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
@@ -133,6 +291,7 @@ class SupplementsListScreen extends StatelessWidget {
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
@@ -147,6 +306,7 @@ class SupplementsListScreen extends StatelessWidget {
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
@@ -161,6 +321,7 @@ class SupplementsListScreen extends StatelessWidget {
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
@@ -175,6 +336,7 @@ class SupplementsListScreen extends StatelessWidget {
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
         ],
@@ -271,6 +433,248 @@ class SupplementsListScreen extends StatelessWidget {
     return grouped;
   }
 
+  void _showRdaSourcesSheet(BuildContext context) {
+    showModalBottomSheet(
+      context: context,
+      showDragHandle: true,
+      builder: (context) {
+        return Padding(
+          padding: const EdgeInsets.all(16),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text(
+                'Dietary reference sources',
+                style: Theme.of(context).textTheme.titleMedium,
+              ),
+              const SizedBox(height: 8),
+              Text(
+                'Source: Health Canada Dietary Reference Intakes. Values are matched by your age and sex. Some ULs (e.g., magnesium) apply to supplemental intake only.',
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: Theme.of(context).colorScheme.onSurfaceVariant,
+                    ),
+              ),
+              const SizedBox(height: 12),
+              ListTile(
+                dense: true,
+                contentPadding: EdgeInsets.zero,
+                leading: const Icon(Icons.open_in_new, size: 18),
+                title: const Text(
+                  'Vitamins reference values',
+                  style: TextStyle(fontSize: 13),
+                ),
+                subtitle: const Text(
+                  'canada.ca • reference-values-vitamins',
+                  style: TextStyle(fontSize: 11),
+                ),
+                onTap: () => _launchUrl('https://www.canada.ca/en/health-canada/services/food-nutrition/healthy-eating/dietary-reference-intakes/tables/reference-values-vitamins.html'),
+              ),
+              ListTile(
+                dense: true,
+                contentPadding: EdgeInsets.zero,
+                leading: const Icon(Icons.open_in_new, size: 18),
+                title: const Text(
+                  'Elements (minerals) reference values',
+                  style: TextStyle(fontSize: 13),
+                ),
+                subtitle: const Text(
+                  'canada.ca • reference-values-elements',
+                  style: TextStyle(fontSize: 11),
+                ),
+                onTap: () => _launchUrl('https://www.canada.ca/en/health-canada/services/food-nutrition/healthy-eating/dietary-reference-intakes/tables/reference-values-elements.html'),
+              ),
+              const SizedBox(height: 8),
+              Text(
+                'Disclaimer: Informational only, some of the details in this app are parsed using AI, and may not be accurate. Always consult a healthcare professional for personalized advice.',
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: Theme.of(context).colorScheme.onSurfaceVariant,
+                    ),
+              ),
+            ],
+          ),
+        );
+      },
+    );
+  }
+
+  Future<void> _launchUrl(String url) async {
+    final uri = Uri.parse(url);
+    await launchUrl(uri, mode: LaunchMode.externalApplication);
+  }
+
+  void _showRdaDetailsSheet(BuildContext context, String nutrientPretty, Map<String, dynamic> data) {
+    showModalBottomSheet(
+      context: context,
+      showDragHandle: true,
+      isScrollControlled: false,
+      builder: (context) {
+        final unitLabel = (data['unitLabel'] as String?) ?? '';
+        final rdaValue = data['rdaValue'] as double?;
+        final ulValue = data['ulValue'] as double?;
+        final total = data['total'] as double?;
+        final pctRda = data['pctRda'] as double?;
+        final pctUl = data['pctUl'] as double?;
+        final rdaType = data['rdaType'] as String? ?? '';
+        final lifeStage = data['lifeStage'] as String? ?? '';
+        final note = data['note'] as String?;
+        final lifeStageDesc = data['lifeStageDescription'] as String?;
+        final rdaValueMin = data['rdaValueMin'] as double?;
+        final rdaValueMax = data['rdaValueMax'] as double?;
+        final nutrientUl = (data['nutrientUl'] as Map?)?.cast<String, dynamic>();
+        return Padding(
+          padding: const EdgeInsets.all(16),
+          child: SingleChildScrollView(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                // Header row: title and sources button
+                Row(
+                  children: [
+                    Expanded(
+                      child: Text(
+                        nutrientPretty,
+                        style: Theme.of(context).textTheme.titleLarge,
+                        overflow: TextOverflow.ellipsis,
+                      ),
+                    ),
+                    IconButton(
+                      tooltip: 'Sources & disclaimer',
+                      icon: const Icon(Icons.info_outline),
+                      onPressed: () => _showRdaSourcesSheet(context),
+                    ),
+                  ],
+                ),
+                if (lifeStage.isNotEmpty || (lifeStageDesc != null && lifeStageDesc.isNotEmpty)) ...[
+                  const SizedBox(height: 4),
+                  Wrap(
+                    spacing: 8,
+                    runSpacing: 4,
+                    children: [
+                      if (lifeStage.isNotEmpty)
+                        InfoChip(
+                          icon: Icons.person_outline,
+                          label: 'Life stage: $lifeStage',
+                          context: context,
+                        ),
+                      if (lifeStageDesc != null && lifeStageDesc.isNotEmpty)
+                        InfoChip(
+                          icon: Icons.info_outline,
+                          label: lifeStageDesc!,
+                          context: context,
+                        ),
+                    ],
+                  ),
+                ],
+                const SizedBox(height: 8),
+                // Intake vs RDA chips
+                Wrap(
+                  spacing: 8,
+                  runSpacing: 8,
+                  children: [
+                    if (total != null)
+                      InfoChip(
+                        icon: Icons.local_drink,
+                        label: 'Intake: ${total.toStringAsFixed(total % 1 == 0 ? 0 : 1)} $unitLabel',
+                        context: context,
+                      ),
+                    if (rdaValueMin != null && rdaValueMax != null)
+                      InfoChip(
+                        icon: Icons.rule,
+                        label: 'RDA: ${rdaValueMin!.toStringAsFixed(rdaValueMin! % 1 == 0 ? 0 : 1)}–${rdaValueMax!.toStringAsFixed(rdaValueMax! % 1 == 0 ? 0 : 1)} $unitLabel',
+                        context: context,
+                      )
+                    else if (rdaValue != null)
+                      InfoChip(
+                        icon: Icons.rule,
+                        label: 'RDA: ${rdaValue!.toStringAsFixed(rdaValue! % 1 == 0 ? 0 : 1)} $unitLabel',
+                        context: context,
+                      ),
+                    if (pctRda != null)
+                      InfoChip(
+                        icon: Icons.percent,
+                        label: '%RDA: ${pctRda.toStringAsFixed(pctRda >= 10 ? 0 : 1)}%',
+                        context: context,
+                      ),
+                    if (ulValue != null)
+                      InfoChip(
+                        icon: Icons.shield_outlined,
+                        label: 'UL: ${ulValue.toStringAsFixed(ulValue % 1 == 0 ? 0 : 1)} $unitLabel',
+                        context: context,
+                      ),
+                    if (pctUl != null)
+                      InfoChip(
+                        icon: Icons.warning_amber,
+                        label: '%UL: ${pctUl.toStringAsFixed(pctUl >= 10 ? 0 : 1)}%',
+                        context: context,
+                      ),
+                  ],
+                ),
+                if (rdaType.isNotEmpty || (note != null && note!.isNotEmpty) || nutrientUl != null) ...[
+                  const SizedBox(height: 12),
+                  Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      if (rdaType.isNotEmpty)
+                        Text(
+                          'Basis: $rdaType',
+                          style: Theme.of(context).textTheme.bodySmall,
+                        ),
+                      if (nutrientUl != null) ...[
+                        const SizedBox(height: 6),
+                        Text(
+                          'Upper limit guidance',
+                          style: Theme.of(context).textTheme.titleSmall,
+                        ),
+                        const SizedBox(height: 4),
+                        Wrap(
+                          spacing: 8,
+                          runSpacing: 4,
+                          children: [
+                            InfoChip(
+                              icon: Icons.shield_moon_outlined,
+                              label: 'UL: ${nutrientUl['value']} ${nutrientUl['unit']}',
+                              context: context,
+                            ),
+                            if ((nutrientUl['duration'] as String?)?.isNotEmpty ?? false)
+                              InfoChip(
+                                icon: Icons.schedule,
+                                label: 'Duration: ${nutrientUl['duration']}',
+                                context: context,
+                              ),
+                          ],
+                        ),
+                        if ((nutrientUl['note'] as String?)?.isNotEmpty ?? false) ...[
+                          const SizedBox(height: 4),
+                          Text(
+                            nutrientUl['note'],
+                            style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                                  color: Theme.of(context).colorScheme.onSurfaceVariant,
+                                ),
+                          ),
+                        ],
+                      ],
+                      if (note != null && note!.isNotEmpty) ...[
+                        const SizedBox(height: 8),
+                        Text(
+                          note!,
+                          style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                                color: Theme.of(context).colorScheme.onSurfaceVariant,
+                              ),
+                        ),
+                      ],
+                    ],
+                  ),
+                ],
+              ],
+            ),
+          ),
+        );
+      },
+    );
+  }
+
   void _showTakeDialog(BuildContext context, Supplement supplement) {
     final unitsController = TextEditingController(text: supplement.numberOfUnits.toString());
     final notesController = TextEditingController();

lib/screens/sync_settings_screen.dart

@@ -1,782 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:provider/provider.dart';
-
-import '../models/sync_enums.dart';
-import '../providers/sync_provider.dart';
-
-/// Screen for configuring WebDAV sync settings
-class SyncSettingsScreen extends StatefulWidget {
-  const SyncSettingsScreen({super.key});
-
-  @override
-  State<SyncSettingsScreen> createState() => _SyncSettingsScreenState();
-}
-
-class _SyncSettingsScreenState extends State<SyncSettingsScreen> {
-  final _formKey = GlobalKey<FormState>();
-  final _serverUrlController = TextEditingController();
-  final _usernameController = TextEditingController();
-  final _passwordController = TextEditingController();
-  final _deviceNameController = TextEditingController();
-  final _syncFolderController = TextEditingController();
-
-  bool _isPasswordVisible = false;
-  bool _isTestingConnection = false;
-  bool _isConfiguring = false;
-
-  @override
-  void initState() {
-    super.initState();
-    _loadCurrentSettings();
-  }
-
-  void _loadCurrentSettings() {
-    final syncProvider = context.read<SyncProvider>();
-    _serverUrlController.text = syncProvider.serverUrl ?? '';
-    _usernameController.text = syncProvider.username ?? '';
-    _syncFolderController.text = syncProvider.syncFolderName ?? 'Supplements';
-    // Note: We don't load the password for security reasons
-  }
-
-  @override
-  void dispose() {
-    _serverUrlController.dispose();
-    _usernameController.dispose();
-    _passwordController.dispose();
-    _deviceNameController.dispose();
-    _syncFolderController.dispose();
-    super.dispose();
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Cloud Sync Settings'),
-        actions: [
-          Consumer<SyncProvider>(
-            builder: (context, syncProvider, child) {
-              if (!syncProvider.isConfigured) return const SizedBox.shrink();
-
-              return PopupMenuButton<String>(
-                onSelected: (value) {
-                  switch (value) {
-                    case 'test':
-                      _testConnection();
-                      break;
-                    case 'sync':
-                      _performSync();
-                      break;
-                    case 'clear':
-                      _showClearConfigDialog();
-                      break;
-                  }
-                },
-                itemBuilder: (context) => [
-                  const PopupMenuItem(
-                    value: 'test',
-                    child: ListTile(
-                      leading: Icon(Icons.wifi_protected_setup),
-                      title: Text('Test Connection'),
-                    ),
-                  ),
-                  const PopupMenuItem(
-                    value: 'sync',
-                    child: ListTile(
-                      leading: Icon(Icons.sync),
-                      title: Text('Sync Now'),
-                    ),
-                  ),
-                  const PopupMenuItem(
-                    value: 'clear',
-                    child: ListTile(
-                      leading: Icon(Icons.clear),
-                      title: Text('Clear Configuration'),
-                    ),
-                  ),
-                ],
-              );
-            },
-          ),
-        ],
-      ),
-      body: Consumer<SyncProvider>(
-        builder: (context, syncProvider, child) {
-          return SingleChildScrollView(
-            padding: const EdgeInsets.all(16),
-            child: Form(
-              key: _formKey,
-              child: Column(
-                crossAxisAlignment: CrossAxisAlignment.start,
-                children: [
-                  _buildStatusCard(syncProvider),
-                  const SizedBox(height: 24),
-                  _buildDeviceInfoSection(syncProvider),
-                  const SizedBox(height: 24),
-                  _buildConfigurationSection(syncProvider),
-                  const SizedBox(height: 24),
-                  _buildSyncSettingsSection(syncProvider),
-                  if (syncProvider.hasPendingConflicts) ...[
-                    const SizedBox(height: 24),
-                    _buildConflictsSection(syncProvider),
-                  ],
-                ],
-              ),
-            ),
-          );
-        },
-      ),
-    );
-  }
-
-  Widget _buildStatusCard(SyncProvider syncProvider) {
-    Color statusColor;
-    IconData statusIcon;
-
-    switch (syncProvider.status) {
-      case SyncOperationStatus.success:
-        statusColor = Colors.green;
-        statusIcon = Icons.check_circle;
-        break;
-      case SyncOperationStatus.syncing:
-        statusColor = Colors.blue;
-        statusIcon = Icons.sync;
-        break;
-      case SyncOperationStatus.networkError:
-      case SyncOperationStatus.authenticationError:
-      case SyncOperationStatus.serverError:
-        statusColor = Colors.red;
-        statusIcon = Icons.error;
-        break;
-      case SyncOperationStatus.conflictsDetected:
-        statusColor = Colors.orange;
-        statusIcon = Icons.warning;
-        break;
-      default:
-        statusColor = Colors.grey;
-        statusIcon = Icons.cloud_off;
-    }
-
-    return Card(
-      child: Padding(
-        padding: const EdgeInsets.all(16),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Row(
-              children: [
-                Icon(statusIcon, color: statusColor, size: 24),
-                const SizedBox(width: 12),
-                Expanded(
-                  child: Text(
-                    syncProvider.statusMessage,
-                    style: Theme.of(context).textTheme.titleMedium,
-                  ),
-                ),
-              ],
-            ),
-            if (syncProvider.lastSyncTime != null) ...[
-              const SizedBox(height: 8),
-              Text(
-                'Last sync: ${syncProvider.formattedLastSyncTime}',
-                style: Theme.of(context).textTheme.bodySmall,
-              ),
-            ],
-            if (syncProvider.isConfigured && syncProvider.detectedServerType != null) ...[
-              const SizedBox(height: 8),
-              Row(
-                children: [
-                  Icon(Icons.check_circle, size: 16, color: Colors.green),
-                  const SizedBox(width: 4),
-                  Text(
-                    'Detected: ${syncProvider.detectedServerType}',
-                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                      color: Colors.green[700],
-                      fontWeight: FontWeight.w500,
-                    ),
-                  ),
-                ],
-              ),
-            ],
-            if (syncProvider.hasError) ...[
-              const SizedBox(height: 8),
-              Text(
-                syncProvider.currentError!,
-                style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                  color: Colors.red,
-                ),
-              ),
-            ],
-            if (syncProvider.isSyncing) ...[
-              const SizedBox(height: 12),
-              LinearProgressIndicator(
-                value: syncProvider.syncProgress,
-              ),
-            ],
-          ],
-        ),
-      ),
-    );
-  }
-
-  Widget _buildConfigurationSection(SyncProvider syncProvider) {
-    return Card(
-      child: Padding(
-        padding: const EdgeInsets.all(16),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Text(
-              'WebDAV Configuration',
-              style: Theme.of(context).textTheme.titleMedium,
-            ),
-            const SizedBox(height: 16),
-            TextFormField(
-              controller: _serverUrlController,
-              decoration: const InputDecoration(
-                labelText: 'Server URL',
-                hintText: 'cloud.example.com or drive.mydomain.com',
-                prefixIcon: Icon(Icons.cloud),
-                helperText: 'Just enter your server domain - we\'ll auto-detect the rest!',
-                helperMaxLines: 2,
-              ),
-              validator: (value) {
-                if (value?.isEmpty ?? true) {
-                  return 'Please enter server URL';
-                }
-                return null;
-              },
-            ),
-            const SizedBox(height: 8),
-            Container(
-              padding: const EdgeInsets.all(12),
-              decoration: BoxDecoration(
-                color: Colors.blue.withOpacity(0.1),
-                borderRadius: BorderRadius.circular(8),
-                border: Border.all(color: Colors.blue.withOpacity(0.3)),
-              ),
-              child: Column(
-                crossAxisAlignment: CrossAxisAlignment.start,
-                children: [
-                  Row(
-                    children: [
-                      Icon(Icons.lightbulb_outline, size: 16, color: Colors.blue[700]),
-                      const SizedBox(width: 8),
-                      Text(
-                        'Smart URL Detection',
-                        style: Theme.of(context).textTheme.titleSmall?.copyWith(
-                          color: Colors.blue[700],
-                          fontWeight: FontWeight.bold,
-                        ),
-                      ),
-                    ],
-                  ),
-                  const SizedBox(height: 8),
-                  Text(
-                    'You can enter simple URLs like:',
-                    style: Theme.of(context).textTheme.bodySmall,
-                  ),
-                  const SizedBox(height: 4),
-                  Text(
-                    '• cloud.example.com\n'
-                    '• drive.mydomain.com\n'
-                    '• nextcloud.company.org\n'
-                    '• my-server.duckdns.org:8080',
-                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                      fontFamily: 'monospace',
-                    ),
-                  ),
-                  const SizedBox(height: 8),
-                  Text(
-                    'We\'ll automatically detect if it\'s Nextcloud, ownCloud, or generic WebDAV and build the correct URL for you!',
-                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                      fontStyle: FontStyle.italic,
-                    ),
-                  ),
-                ],
-              ),
-            ),
-            const SizedBox(height: 16),
-            TextFormField(
-              controller: _usernameController,
-              decoration: const InputDecoration(
-                labelText: 'Username',
-                prefixIcon: Icon(Icons.person),
-              ),
-              validator: (value) {
-                if (value?.isEmpty ?? true) {
-                  return 'Please enter username';
-                }
-                return null;
-              },
-            ),
-            const SizedBox(height: 16),
-            TextFormField(
-              controller: _passwordController,
-              obscureText: !_isPasswordVisible,
-              decoration: InputDecoration(
-                labelText: 'Password / App Password',
-                prefixIcon: const Icon(Icons.lock),
-                suffixIcon: IconButton(
-                  icon: Icon(
-                    _isPasswordVisible ? Icons.visibility : Icons.visibility_off,
-                  ),
-                  onPressed: () {
-                    setState(() {
-                      _isPasswordVisible = !_isPasswordVisible;
-                    });
-                  },
-                ),
-                helperText: 'Use app passwords for better security',
-              ),
-              validator: (value) {
-                if (value?.isEmpty ?? true) {
-                  return 'Please enter password';
-                }
-                return null;
-              },
-            ),
-            const SizedBox(height: 16),
-            TextFormField(
-              controller: _syncFolderController,
-              decoration: const InputDecoration(
-                labelText: 'Sync Folder Name',
-                prefixIcon: Icon(Icons.folder),
-                hintText: 'Supplements',
-                helperText: 'Folder name on your cloud server for syncing data',
-              ),
-              validator: (value) {
-                if (value?.isEmpty ?? true) {
-                  return 'Please enter folder name';
-                }
-                if (value!.contains('/') || value.contains('\\')) {
-                  return 'Folder name cannot contain slashes';
-                }
-                return null;
-              },
-            ),
-            const SizedBox(height: 16),
-            TextFormField(
-              controller: _deviceNameController,
-              decoration: const InputDecoration(
-                labelText: 'Device Name (Optional)',
-                prefixIcon: Icon(Icons.phone_android),
-                hintText: 'My Phone',
-              ),
-            ),
-            const SizedBox(height: 24),
-            Row(
-              children: [
-                Expanded(
-                  child: ElevatedButton.icon(
-                    onPressed: _isConfiguring || syncProvider.isSyncing
-                        ? null
-                        : () => _configureWebDAV(syncProvider),
-                    icon: _isConfiguring
-                        ? const SizedBox(
-                            width: 16,
-                            height: 16,
-                            child: CircularProgressIndicator(strokeWidth: 2),
-                          )
-                        : const Icon(Icons.save),
-                    label: Text(syncProvider.isConfigured ? 'Update' : 'Configure'),
-                  ),
-                ),
-                if (syncProvider.isConfigured) ...[
-                  const SizedBox(width: 12),
-                  ElevatedButton.icon(
-                    onPressed: _isTestingConnection || syncProvider.isSyncing
-                        ? null
-                        : _testConnection,
-                    icon: _isTestingConnection
-                        ? const SizedBox(
-                            width: 16,
-                            height: 16,
-                            child: CircularProgressIndicator(strokeWidth: 2),
-                          )
-                        : const Icon(Icons.wifi_protected_setup),
-                    label: const Text('Test'),
-                  ),
-                ],
-              ],
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-
-  Widget _buildSyncSettingsSection(SyncProvider syncProvider) {
-    if (!syncProvider.isConfigured) return const SizedBox.shrink();
-
-    return Card(
-      child: Padding(
-        padding: const EdgeInsets.all(16),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Text(
-              'Sync Settings',
-              style: Theme.of(context).textTheme.titleMedium,
-            ),
-            const SizedBox(height: 16),
-            SwitchListTile(
-              title: const Text('Auto Sync on Data Changes'),
-              subtitle: const Text('Automatically sync when you add, modify, or take supplements'),
-              value: syncProvider.autoSyncOnDataChanges,
-              onChanged: syncProvider.setAutoSyncOnDataChanges,
-            ),
-            const SizedBox(height: 8),
-            ListTile(
-              title: const Text('Conflict Resolution'),
-              subtitle: Text(_getConflictStrategyDescription(syncProvider.conflictStrategy)),
-              trailing: DropdownButton<ConflictResolutionStrategy>(
-                value: syncProvider.conflictStrategy,
-                onChanged: (strategy) {
-                  if (strategy != null) {
-                    syncProvider.setConflictResolutionStrategy(strategy);
-                  }
-                },
-                items: ConflictResolutionStrategy.values
-                    .map((strategy) => DropdownMenuItem(
-                          value: strategy,
-                          child: Text(_getConflictStrategyName(strategy)),
-                        ))
-                    .toList(),
-              ),
-            ),
-            const SizedBox(height: 16),
-            SizedBox(
-              width: double.infinity,
-              child: ElevatedButton.icon(
-                onPressed: syncProvider.isSyncing ? null : _performSync,
-                icon: syncProvider.isSyncing
-                    ? const SizedBox(
-                        width: 16,
-                        height: 16,
-                        child: CircularProgressIndicator(strokeWidth: 2),
-                      )
-                    : const Icon(Icons.sync),
-                label: const Text('Sync Now'),
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-
-  Widget _buildConflictsSection(SyncProvider syncProvider) {
-    return Card(
-      child: Padding(
-        padding: const EdgeInsets.all(16),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Row(
-              children: [
-                const Icon(Icons.warning, color: Colors.orange),
-                const SizedBox(width: 8),
-                Text(
-                  'Sync Conflicts',
-                  style: Theme.of(context).textTheme.titleMedium,
-                ),
-              ],
-            ),
-            const SizedBox(height: 16),
-            Text(
-              '${syncProvider.pendingConflicts.length} conflicts need your attention',
-              style: Theme.of(context).textTheme.bodyMedium,
-            ),
-            const SizedBox(height: 16),
-            Row(
-              children: [
-                Expanded(
-                  child: ElevatedButton(
-                    onPressed: () => _showConflictsDialog(syncProvider),
-                    child: const Text('Review Conflicts'),
-                  ),
-                ),
-                const SizedBox(width: 12),
-                ElevatedButton(
-                  onPressed: syncProvider.resolveAllConflicts,
-                  child: const Text('Auto Resolve'),
-                ),
-              ],
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-
-  Widget _buildDeviceInfoSection(SyncProvider syncProvider) {
-    return Card(
-      child: Padding(
-        padding: const EdgeInsets.all(16),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Text(
-              'Connection Information',
-              style: Theme.of(context).textTheme.titleMedium,
-            ),
-            const SizedBox(height: 16),
-            FutureBuilder<Map<String, String?>>(
-              future: syncProvider.getDeviceInfo(),
-              builder: (context, snapshot) {
-                if (!snapshot.hasData) {
-                  return const Center(child: CircularProgressIndicator());
-                }
-
-                final deviceInfo = snapshot.data!;
-                return Column(
-                  children: [
-                    if (syncProvider.detectedServerType != null)
-                      ListTile(
-                        leading: const Icon(Icons.cloud_done),
-                        title: const Text('Server Type'),
-                        subtitle: Text(syncProvider.detectedServerType!),
-                      ),
-                    if (syncProvider.finalWebdavUrl != null)
-                      ListTile(
-                        leading: const Icon(Icons.link),
-                        title: const Text('WebDAV URL'),
-                        subtitle: Text(
-                          syncProvider.finalWebdavUrl!,
-                          style: const TextStyle(fontFamily: 'monospace', fontSize: 12),
-                        ),
-                      ),
-                    ListTile(
-                      leading: const Icon(Icons.fingerprint),
-                      title: const Text('Device ID'),
-                      subtitle: Text(deviceInfo['deviceId'] ?? 'Unknown'),
-                    ),
-                    ListTile(
-                      leading: const Icon(Icons.devices),
-                      title: const Text('Device Name'),
-                      subtitle: Text(deviceInfo['deviceName'] ?? 'Unknown'),
-                    ),
-                  ],
-                );
-              },
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-
-  String _getConflictStrategyName(ConflictResolutionStrategy strategy) {
-    switch (strategy) {
-      case ConflictResolutionStrategy.preferLocal:
-        return 'Prefer Local';
-      case ConflictResolutionStrategy.preferRemote:
-        return 'Prefer Remote';
-      case ConflictResolutionStrategy.preferNewer:
-        return 'Prefer Newer';
-      case ConflictResolutionStrategy.manual:
-        return 'Manual';
-    }
-  }
-
-  String _getConflictStrategyDescription(ConflictResolutionStrategy strategy) {
-    switch (strategy) {
-      case ConflictResolutionStrategy.preferLocal:
-        return 'Always keep local changes';
-      case ConflictResolutionStrategy.preferRemote:
-        return 'Always keep remote changes';
-      case ConflictResolutionStrategy.preferNewer:
-        return 'Keep most recent changes';
-      case ConflictResolutionStrategy.manual:
-        return 'Review each conflict manually';
-    }
-  }
-
-  Future<void> _configureWebDAV(SyncProvider syncProvider) async {
-    // For updates, allow empty password to keep existing one
-    if (syncProvider.isConfigured && _passwordController.text.isEmpty) {
-      // Skip validation for password on updates
-      if (_serverUrlController.text.trim().isEmpty || _usernameController.text.trim().isEmpty) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(
-            content: Text('Please fill in server URL and username'),
-            backgroundColor: Colors.red,
-          ),
-        );
-        return;
-      }
-    } else if (!_formKey.currentState!.validate()) {
-      return;
-    }
-
-    setState(() => _isConfiguring = true);
-
-    final success = await syncProvider.configure(
-      serverUrl: _serverUrlController.text.trim(),
-      username: _usernameController.text.trim(),
-      password: _passwordController.text.isEmpty ? null : _passwordController.text,
-      deviceName: _deviceNameController.text.trim().isEmpty
-          ? null
-          : _deviceNameController.text.trim(),
-      syncFolderName: _syncFolderController.text.trim().isEmpty
-          ? 'Supplements'
-          : _syncFolderController.text.trim(),
-    );
-
-    setState(() => _isConfiguring = false);
-
-    if (mounted) {
-      final message = success
-        ? 'WebDAV configured successfully!'
-        : 'Failed to configure WebDAV';
-
-      final detectionInfo = success && syncProvider.detectedServerType != null
-        ? '\nDetected: ${syncProvider.detectedServerType}'
-        : '';
-
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(
-          content: Text('$message$detectionInfo'),
-          backgroundColor: success ? Colors.green : Colors.red,
-          duration: Duration(seconds: success ? 4 : 3),
-        ),
-      );
-
-      if (success) {
-        _passwordController.clear(); // Clear password for security
-      }
-    }
-  }
-
-  Future<void> _testConnection() async {
-    setState(() => _isTestingConnection = true);
-
-    final syncProvider = context.read<SyncProvider>();
-    final success = await syncProvider.testConnection();
-
-    setState(() => _isTestingConnection = false);
-
-    if (mounted) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(
-          content: Text(success
-              ? 'Connection test successful!'
-              : 'Connection test failed'),
-          backgroundColor: success ? Colors.green : Colors.red,
-        ),
-      );
-    }
-  }
-
-  Future<void> _performSync() async {
-    final syncProvider = context.read<SyncProvider>();
-    final success = await syncProvider.performManualSync();
-
-    if (mounted) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(
-          content: Text(success
-              ? 'Sync completed successfully!'
-              : 'Sync failed'),
-          backgroundColor: success ? Colors.green : Colors.red,
-        ),
-      );
-    }
-  }
-
-  Future<void> _showClearConfigDialog() async {
-    final confirmed = await showDialog<bool>(
-      context: context,
-      builder: (context) => AlertDialog(
-        title: const Text('Clear Configuration'),
-        content: const Text(
-          'Are you sure you want to clear the WebDAV configuration? '
-          'This will disable cloud sync.',
-        ),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.of(context).pop(false),
-            child: const Text('Cancel'),
-          ),
-          TextButton(
-            onPressed: () => Navigator.of(context).pop(true),
-            child: const Text('Clear'),
-          ),
-        ],
-      ),
-    );
-
-    if (confirmed == true) {
-      final syncProvider = context.read<SyncProvider>();
-      await syncProvider.clearConfiguration();
-      _serverUrlController.clear();
-      _usernameController.clear();
-      _passwordController.clear();
-      _deviceNameController.clear();
-
-      if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(
-            content: Text('Configuration cleared'),
-            backgroundColor: Colors.orange,
-          ),
-        );
-      }
-    }
-  }
-
-  Future<void> _showConflictsDialog(SyncProvider syncProvider) async {
-    await showDialog(
-      context: context,
-      builder: (context) => AlertDialog(
-        title: const Text('Sync Conflicts'),
-        content: SizedBox(
-          width: double.maxFinite,
-          height: 300,
-          child: ListView.builder(
-            itemCount: syncProvider.pendingConflicts.length,
-            itemBuilder: (context, index) {
-              final conflict = syncProvider.pendingConflicts[index];
-              return Card(
-                child: ListTile(
-                  title: Text(conflict.type.name),
-                  subtitle: Text(conflict.description),
-                  trailing: Row(
-                    mainAxisSize: MainAxisSize.min,
-                    children: [
-                      TextButton(
-                        onPressed: () {
-                          syncProvider.resolveConflict(
-                            conflict.syncId,
-                            ConflictResolution.useLocal,
-                          );
-                        },
-                        child: const Text('Local'),
-                      ),
-                      TextButton(
-                        onPressed: () {
-                          syncProvider.resolveConflict(
-                            conflict.syncId,
-                            ConflictResolution.useRemote,
-                          );
-                        },
-                        child: const Text('Remote'),
-                      ),
-                    ],
-                  ),
-                ),
-              );
-            },
-          ),
-        ),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.of(context).pop(),
-            child: const Text('Close'),
-          ),
-        ],
-      ),
-    );
-  }
-}

lib/services/auto_sync_service.dart

@@ -0,0 +1,470 @@
+import 'dart:async';
+import 'dart:io';
+import 'dart:math';
+import 'package:flutter/foundation.dart';
+
+import '../providers/settings_provider.dart';
+import '../providers/simple_sync_provider.dart';
+
+/// Error types for auto-sync operations
+enum AutoSyncErrorType {
+  network,
+  configuration,
+  authentication,
+  server,
+  unknown,
+}
+
+/// Represents an auto-sync error with context
+class AutoSyncError {
+  final AutoSyncErrorType type;
+  final String message;
+  final DateTime timestamp;
+  final dynamic originalError;
+
+  AutoSyncError({
+    required this.type,
+    required this.message,
+    required this.timestamp,
+    this.originalError,
+  });
+
+  @override
+  String toString() => 'AutoSyncError($type): $message';
+}
+
+/// Service that handles automatic synchronization with debouncing logic
+/// to prevent excessive sync requests when multiple data changes occur rapidly.
+class AutoSyncService {
+  Timer? _debounceTimer;
+  bool _syncInProgress = false;
+  bool _hasPendingSync = false;
+  
+  // Error handling and retry logic
+  final List<AutoSyncError> _recentErrors = [];
+  int _consecutiveFailures = 0;
+  DateTime? _lastFailureTime;
+  Timer? _retryTimer;
+  bool _autoDisabledDueToErrors = false;
+  
+  // Exponential backoff configuration
+  static const int _maxRetryAttempts = 5;
+  static const int _baseRetryDelaySeconds = 30;
+  static const int _maxRetryDelaySeconds = 300; // 5 minutes
+  static const int _errorHistoryMaxSize = 10;
+  static const int _autoDisableThreshold = 3; // Consecutive failures before auto-disable
+  
+  final SimpleSyncProvider _syncProvider;
+  final SettingsProvider _settingsProvider;
+  
+  AutoSyncService({
+    required SimpleSyncProvider syncProvider,
+    required SettingsProvider settingsProvider,
+  }) : _syncProvider = syncProvider,
+       _settingsProvider = settingsProvider;
+
+  /// Triggers an auto-sync if enabled in settings.
+  /// Uses debouncing to prevent excessive sync requests.
+  void triggerAutoSync() {
+    // Check if auto-sync is enabled
+    if (!_settingsProvider.autoSyncEnabled) {
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync is disabled, skipping trigger');
+      }
+      return;
+    }
+
+    // Check if auto-sync was disabled due to persistent errors
+    if (_autoDisabledDueToErrors) {
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync disabled due to persistent errors, skipping trigger');
+      }
+      return;
+    }
+
+    // Check if sync is configured
+    if (!_syncProvider.isConfigured) {
+      _recordError(AutoSyncError(
+        type: AutoSyncErrorType.configuration,
+        message: 'Sync not configured. Please configure cloud sync settings.',
+        timestamp: DateTime.now(),
+      ));
+      if (kDebugMode) {
+        print('AutoSyncService: Sync not configured, skipping auto-sync');
+      }
+      return;
+    }
+
+    // If sync is already in progress, mark that we have a pending sync
+    if (_syncInProgress || _syncProvider.isSyncing) {
+      _hasPendingSync = true;
+      if (kDebugMode) {
+        print('AutoSyncService: Sync in progress, marking pending sync');
+      }
+      return;
+    }
+
+    // Cancel existing timer if one is running
+    _cancelPendingSync();
+
+    // Check if we should apply exponential backoff
+    final backoffDelay = _calculateBackoffDelay();
+    if (backoffDelay > 0) {
+      if (kDebugMode) {
+        print('AutoSyncService: Applying backoff delay of ${backoffDelay}s due to recent failures');
+      }
+      _debounceTimer = Timer(Duration(seconds: backoffDelay), () {
+        _executePendingSync();
+      });
+      return;
+    }
+
+    // Start new debounce timer
+    final debounceSeconds = _settingsProvider.autoSyncDebounceSeconds;
+    _debounceTimer = Timer(Duration(seconds: debounceSeconds), () {
+      _executePendingSync();
+    });
+
+    if (kDebugMode) {
+      print('AutoSyncService: Auto-sync scheduled in ${debounceSeconds}s');
+    }
+  }
+
+  /// Executes the pending sync operation
+  Future<void> _executePendingSync() async {
+    // Double-check conditions before executing
+    if (!_settingsProvider.autoSyncEnabled) {
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync disabled during execution, aborting');
+      }
+      return;
+    }
+
+    if (_autoDisabledDueToErrors) {
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync disabled due to errors during execution, aborting');
+      }
+      return;
+    }
+
+    if (!_syncProvider.isConfigured) {
+      _recordError(AutoSyncError(
+        type: AutoSyncErrorType.configuration,
+        message: 'Sync not configured during execution',
+        timestamp: DateTime.now(),
+      ));
+      if (kDebugMode) {
+        print('AutoSyncService: Sync not configured during execution, aborting');
+      }
+      return;
+    }
+
+    if (_syncInProgress || _syncProvider.isSyncing) {
+      if (kDebugMode) {
+        print('AutoSyncService: Sync already in progress during execution, aborting');
+      }
+      return;
+    }
+
+    _syncInProgress = true;
+    _hasPendingSync = false;
+
+    try {
+      if (kDebugMode) {
+        print('AutoSyncService: Executing auto-sync (attempt ${_consecutiveFailures + 1})');
+      }
+      
+      // Check network connectivity before attempting sync
+      if (!await _isNetworkAvailable()) {
+        throw AutoSyncError(
+          type: AutoSyncErrorType.network,
+          message: 'Network is not available',
+          timestamp: DateTime.now(),
+        );
+      }
+      
+      await _syncProvider.syncDatabase(isAutoSync: true);
+      
+      // Reset failure count on successful sync
+      _consecutiveFailures = 0;
+      _lastFailureTime = null;
+      _autoDisabledDueToErrors = false;
+      
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync completed successfully');
+      }
+      
+    } catch (e) {
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync failed: $e');
+      }
+      
+      // Handle specific error types
+      _handleSyncError(e);
+      
+    } finally {
+      _syncInProgress = false;
+      
+      // If there was a pending sync request while we were syncing, trigger it
+      if (_hasPendingSync && !_autoDisabledDueToErrors) {
+        if (kDebugMode) {
+          print('AutoSyncService: Processing queued sync request');
+        }
+        _hasPendingSync = false;
+        // Use a small delay to avoid immediate re-triggering
+        Timer(const Duration(milliseconds: 500), () {
+          triggerAutoSync();
+        });
+      }
+    }
+  }
+
+  /// Handles sync errors with appropriate recovery strategies
+  void _handleSyncError(dynamic error) {
+    _consecutiveFailures++;
+    _lastFailureTime = DateTime.now();
+    
+    final autoSyncError = _categorizeError(error);
+    _recordError(autoSyncError);
+    
+    // Check if we should disable auto-sync due to persistent errors
+    if (_consecutiveFailures >= _autoDisableThreshold) {
+      _autoDisabledDueToErrors = true;
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync disabled due to ${_consecutiveFailures} consecutive failures');
+      }
+      
+      // For configuration errors, disable immediately
+      if (autoSyncError.type == AutoSyncErrorType.configuration ||
+          autoSyncError.type == AutoSyncErrorType.authentication) {
+        if (kDebugMode) {
+          print('AutoSyncService: Auto-sync disabled due to configuration/authentication error');
+        }
+      }
+    }
+    
+    // Schedule retry for recoverable errors (unless auto-disabled)
+    if (!_autoDisabledDueToErrors && _shouldRetry(autoSyncError.type)) {
+      _scheduleRetry();
+    }
+  }
+
+  /// Categorizes an error into a specific AutoSyncError type
+  AutoSyncError _categorizeError(dynamic error) {
+    final errorString = error.toString().toLowerCase();
+    
+    // Network-related errors
+    if (error is SocketException ||
+        errorString.contains('network') || 
+        errorString.contains('connection') ||
+        errorString.contains('timeout') ||
+        errorString.contains('unreachable') ||
+        errorString.contains('host lookup failed') ||
+        errorString.contains('no route to host')) {
+      return AutoSyncError(
+        type: AutoSyncErrorType.network,
+        message: 'Network connection failed. Check your internet connection.',
+        timestamp: DateTime.now(),
+        originalError: error,
+      );
+    }
+    
+    // Configuration-related errors
+    if (errorString.contains('not configured') ||
+        errorString.contains('invalid url') ||
+        errorString.contains('malformed url')) {
+      return AutoSyncError(
+        type: AutoSyncErrorType.configuration,
+        message: 'Sync configuration is invalid. Please check your sync settings.',
+        timestamp: DateTime.now(),
+        originalError: error,
+      );
+    }
+    
+    // Authentication errors
+    if (errorString.contains('authentication') ||
+        errorString.contains('unauthorized') ||
+        errorString.contains('401') ||
+        errorString.contains('403') ||
+        errorString.contains('invalid credentials')) {
+      return AutoSyncError(
+        type: AutoSyncErrorType.authentication,
+        message: 'Authentication failed. Please check your username and password.',
+        timestamp: DateTime.now(),
+        originalError: error,
+      );
+    }
+    
+    // Server errors
+    if (errorString.contains('500') ||
+        errorString.contains('502') ||
+        errorString.contains('503') ||
+        errorString.contains('504') ||
+        errorString.contains('server error')) {
+      return AutoSyncError(
+        type: AutoSyncErrorType.server,
+        message: 'Server error occurred. The sync server may be temporarily unavailable.',
+        timestamp: DateTime.now(),
+        originalError: error,
+      );
+    }
+    
+    // Unknown errors
+    return AutoSyncError(
+      type: AutoSyncErrorType.unknown,
+      message: 'An unexpected error occurred during sync: ${error.toString()}',
+      timestamp: DateTime.now(),
+      originalError: error,
+    );
+  }
+
+  /// Records an error in the recent errors list
+  void _recordError(AutoSyncError error) {
+    _recentErrors.add(error);
+    
+    // Keep only recent errors
+    if (_recentErrors.length > _errorHistoryMaxSize) {
+      _recentErrors.removeAt(0);
+    }
+    
+    if (kDebugMode) {
+      print('AutoSyncService: Recorded error: $error');
+    }
+  }
+
+  /// Determines if we should retry for a given error type
+  bool _shouldRetry(AutoSyncErrorType errorType) {
+    switch (errorType) {
+      case AutoSyncErrorType.network:
+      case AutoSyncErrorType.server:
+        return _consecutiveFailures < _maxRetryAttempts;
+      case AutoSyncErrorType.configuration:
+      case AutoSyncErrorType.authentication:
+        return false; // Don't retry config/auth errors
+      case AutoSyncErrorType.unknown:
+        return _consecutiveFailures < _maxRetryAttempts;
+    }
+  }
+
+  /// Calculates the backoff delay based on consecutive failures
+  int _calculateBackoffDelay() {
+    if (_consecutiveFailures == 0 || _lastFailureTime == null) {
+      return 0;
+    }
+    
+    // Calculate exponential backoff: base * (2^failures)
+    final backoffSeconds = min(
+      _baseRetryDelaySeconds * pow(2, _consecutiveFailures - 1).toInt(),
+      _maxRetryDelaySeconds,
+    );
+    
+    // Check if enough time has passed since last failure
+    final timeSinceLastFailure = DateTime.now().difference(_lastFailureTime!).inSeconds;
+    if (timeSinceLastFailure >= backoffSeconds) {
+      return 0; // No additional delay needed
+    }
+    
+    return backoffSeconds - timeSinceLastFailure;
+  }
+
+  /// Schedules a retry attempt with exponential backoff
+  void _scheduleRetry() {
+    final retryDelay = _calculateBackoffDelay();
+    if (retryDelay <= 0) return;
+    
+    _retryTimer?.cancel();
+    _retryTimer = Timer(Duration(seconds: retryDelay), () {
+      if (kDebugMode) {
+        print('AutoSyncService: Retrying auto-sync after backoff delay');
+      }
+      triggerAutoSync();
+    });
+    
+    if (kDebugMode) {
+      print('AutoSyncService: Scheduled retry in ${retryDelay}s');
+    }
+  }
+
+  /// Checks if network is available
+  Future<bool> _isNetworkAvailable() async {
+    try {
+      final result = await InternetAddress.lookup('google.com');
+      return result.isNotEmpty && result[0].rawAddress.isNotEmpty;
+    } catch (e) {
+      if (kDebugMode) {
+        print('AutoSyncService: Network check failed: $e');
+      }
+      return false;
+    }
+  }
+
+  /// Cancels any pending sync operation
+  void cancelPendingSync() {
+    _cancelPendingSync();
+    _retryTimer?.cancel();
+    _retryTimer = null;
+    _hasPendingSync = false;
+    
+    if (kDebugMode) {
+      print('AutoSyncService: Cancelled pending sync and retry timer');
+    }
+  }
+
+  /// Internal method to cancel the debounce timer
+  void _cancelPendingSync() {
+    _debounceTimer?.cancel();
+    _debounceTimer = null;
+  }
+
+  /// Resets error state and re-enables auto-sync if it was disabled
+  void resetErrorState() {
+    _consecutiveFailures = 0;
+    _lastFailureTime = null;
+    _autoDisabledDueToErrors = false;
+    _recentErrors.clear();
+    _retryTimer?.cancel();
+    _retryTimer = null;
+    
+    if (kDebugMode) {
+      print('AutoSyncService: Error state reset, auto-sync re-enabled');
+    }
+  }
+
+  /// Disposes of the service and cleans up resources
+  void dispose() {
+    _cancelPendingSync();
+    _retryTimer?.cancel();
+    _retryTimer = null;
+    _hasPendingSync = false;
+    _syncInProgress = false;
+    _recentErrors.clear();
+    
+    if (kDebugMode) {
+      print('AutoSyncService: Disposed');
+    }
+  }
+
+  /// Returns true if there is a pending sync operation
+  bool get hasPendingSync => _hasPendingSync || _debounceTimer != null;
+
+  /// Returns true if a sync is currently in progress
+  bool get isSyncInProgress => _syncInProgress;
+
+  /// Returns true if auto-sync was disabled due to persistent errors
+  bool get isAutoDisabledDueToErrors => _autoDisabledDueToErrors;
+
+  /// Returns the number of consecutive failures
+  int get consecutiveFailures => _consecutiveFailures;
+
+  /// Returns a copy of recent errors
+  List<AutoSyncError> get recentErrors => List.unmodifiable(_recentErrors);
+
+  /// Returns the last error message suitable for display to users
+  String? get lastErrorMessage {
+    if (_recentErrors.isEmpty) return null;
+    return _recentErrors.last.message;
+  }
+
+  /// Returns true if a retry is currently scheduled
+  bool get hasScheduledRetry => _retryTimer != null;
+}

lib/services/database_helper.dart

@@ -6,7 +6,7 @@ import 'package:sqflite_common_ffi/sqflite_ffi.dart';
 
 import '../models/supplement.dart';
 import '../models/supplement_intake.dart';
-import '../models/sync_enums.dart';
+import 'database_sync_service.dart';
 
 class DatabaseHelper {
   static const _databaseName = 'supplements.db';
@@ -399,7 +399,43 @@ class DatabaseHelper {
     Database db = await database;
     return await db.update(
       supplementsTable,
-      {'isActive': 0},
+      {
+        'isActive': 0,
+        'isDeleted': 1,
+        'lastModified': DateTime.now().toIso8601String(),
+      },
+      where: 'id = ?',
+      whereArgs: [id],
+    );
+  }
+
+  Future<int> permanentlyDeleteSupplement(int id) async {
+    Database db = await database;
+    
+    // For sync compatibility, we should mark as deleted rather than completely removing
+    // This prevents the supplement from reappearing during sync
+    
+    // First mark all related intakes as deleted
+    await db.update(
+      intakesTable,
+      {
+        'isDeleted': 1,
+        'lastModified': DateTime.now().toIso8601String(),
+        'syncStatus': RecordSyncStatus.modified.name,
+      },
+      where: 'supplementId = ? AND isDeleted = ?',
+      whereArgs: [id, 0],
+    );
+    
+    // Then mark the supplement as deleted instead of removing it completely
+    return await db.update(
+      supplementsTable,
+      {
+        'isDeleted': 1,
+        'isActive': 0, // Also ensure it's archived
+        'lastModified': DateTime.now().toIso8601String(),
+        'syncStatus': RecordSyncStatus.modified.name,
+      },
       where: 'id = ?',
       whereArgs: [id],
     );
@@ -411,6 +447,36 @@ class DatabaseHelper {
     return await db.insert(intakesTable, intake.toMap());
   }
 
+  Future<int> deleteIntake(int id) async {
+    Database db = await database;
+    return await db.update(
+      intakesTable,
+      {
+        'isDeleted': 1,
+        'lastModified': DateTime.now().toIso8601String(),
+      },
+      where: 'id = ?',
+      whereArgs: [id],
+    );
+  }
+
+  Future<int> permanentlyDeleteIntake(int id) async {
+    Database db = await database;
+    
+    // For sync compatibility, mark as deleted rather than completely removing
+    // This prevents the intake from reappearing during sync
+    return await db.update(
+      intakesTable,
+      {
+        'isDeleted': 1,
+        'lastModified': DateTime.now().toIso8601String(),
+        'syncStatus': RecordSyncStatus.modified.name,
+      },
+      where: 'id = ?',
+      whereArgs: [id],
+    );
+  }
+
   Future<List<SupplementIntake>> getIntakesForDate(DateTime date) async {
     Database db = await database;
     String startDate = DateTime(date.year, date.month, date.day).toIso8601String();
@@ -477,15 +543,6 @@ class DatabaseHelper {
     return result;
   }
 
-  Future<int> deleteIntake(int id) async {
-    Database db = await database;
-    return await db.delete(
-      intakesTable,
-      where: 'id = ?',
-      whereArgs: [id],
-    );
-  }
-
   // Notification tracking methods
   Future<int> trackNotification({
     required int notificationId,
@@ -637,7 +694,7 @@ class DatabaseHelper {
     List<Map<String, dynamic>> maps = await db.query(
       supplementsTable,
       where: 'syncStatus IN (?, ?)',
-      whereArgs: [SyncStatus.pending.name, SyncStatus.modified.name],
+      whereArgs: [RecordSyncStatus.pending.name, RecordSyncStatus.modified.name],
       orderBy: 'lastModified ASC',
     );
     return List.generate(maps.length, (i) => Supplement.fromMap(maps[i]));
@@ -648,7 +705,7 @@ class DatabaseHelper {
     List<Map<String, dynamic>> maps = await db.query(
       intakesTable,
       where: 'syncStatus IN (?, ?)',
-      whereArgs: [SyncStatus.pending.name, SyncStatus.modified.name],
+      whereArgs: [RecordSyncStatus.pending.name, RecordSyncStatus.modified.name],
       orderBy: 'lastModified ASC',
     );
     return List.generate(maps.length, (i) => SupplementIntake.fromMap(maps[i]));
@@ -658,7 +715,7 @@ class DatabaseHelper {
     Database db = await database;
     await db.update(
       supplementsTable,
-      {'syncStatus': SyncStatus.synced.name},
+      {'syncStatus': RecordSyncStatus.synced.name},
       where: 'syncId = ?',
       whereArgs: [syncId],
     );
@@ -668,7 +725,7 @@ class DatabaseHelper {
     Database db = await database;
     await db.update(
       intakesTable,
-      {'syncStatus': SyncStatus.synced.name},
+      {'syncStatus': RecordSyncStatus.synced.name},
       where: 'syncId = ?',
       whereArgs: [syncId],
     );

lib/services/database_sync_service.dart

@@ -0,0 +1,532 @@
+import 'dart:io' as io;
+import 'package:flutter/foundation.dart';
+import 'package:path/path.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:sqflite/sqflite.dart';
+import 'package:webdav_client/webdav_client.dart';
+
+import '../models/supplement.dart';
+import '../models/supplement_intake.dart';
+import 'database_helper.dart';
+
+enum SyncStatus {
+  idle,
+  downloading,
+  merging,
+  uploading,
+  completed,
+  error,
+}
+
+// Legacy record-level sync status for models
+enum RecordSyncStatus {
+  pending,
+  synced,
+  modified,
+}
+
+class DatabaseSyncService {
+  static const String _remoteDbFileName = 'supplements.db';
+
+  // SharedPreferences keys for persistence
+  static const String _keyServerUrl = 'sync_server_url';
+  static const String _keyUsername = 'sync_username';
+  static const String _keyPassword = 'sync_password';
+  static const String _keyRemotePath = 'sync_remote_path';
+
+  Client? _client;
+  String? _remotePath;
+
+  // Store configuration values
+  String? _serverUrl;
+  String? _username;
+  String? _password;
+  String? _configuredRemotePath;
+
+  final DatabaseHelper _databaseHelper = DatabaseHelper.instance;
+
+  SyncStatus _status = SyncStatus.idle;
+  String? _lastError;
+  DateTime? _lastSyncTime;
+
+  // Getters
+  SyncStatus get status => _status;
+  String? get lastError => _lastError;
+  DateTime? get lastSyncTime => _lastSyncTime;
+  bool get isConfigured => _client != null;
+
+  // Configuration getters
+  String? get serverUrl => _serverUrl;
+  String? get username => _username;
+  String? get password => _password;
+  String? get remotePath => _configuredRemotePath;
+
+  // Callbacks for UI updates
+  Function(SyncStatus)? onStatusChanged;
+  Function(String)? onError;
+  Function()? onSyncCompleted;
+
+  DatabaseSyncService() {
+    loadSavedConfiguration();
+  }
+
+  // Load saved configuration from SharedPreferences
+  Future<void> loadSavedConfiguration() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      _serverUrl = prefs.getString(_keyServerUrl);
+      _username = prefs.getString(_keyUsername);
+      _password = prefs.getString(_keyPassword);
+      _configuredRemotePath = prefs.getString(_keyRemotePath);
+
+      // If we have saved configuration, set up the client
+      if (_serverUrl != null && _username != null && _password != null && _configuredRemotePath != null) {
+        _remotePath = _configuredRemotePath!.endsWith('/') ? _configuredRemotePath : '$_configuredRemotePath/';
+
+        _client = newClient(
+          _serverUrl!,
+          user: _username!,
+          password: _password!,
+          debug: kDebugMode,
+        );
+      }
+    } catch (e) {
+      if (kDebugMode) {
+        print('SupplementsLog: Error loading saved sync configuration: $e');
+      }
+    }
+  }
+
+  // Save configuration to SharedPreferences
+  Future<void> _saveConfiguration() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      if (_serverUrl != null) await prefs.setString(_keyServerUrl, _serverUrl!);
+      if (_username != null) await prefs.setString(_keyUsername, _username!);
+      if (_password != null) await prefs.setString(_keyPassword, _password!);
+      if (_configuredRemotePath != null) await prefs.setString(_keyRemotePath, _configuredRemotePath!);
+    } catch (e) {
+      if (kDebugMode) {
+        print('SupplementsLog: Error saving sync configuration: $e');
+      }
+    }
+  }
+
+  void configure({
+    required String serverUrl,
+    required String username,
+    required String password,
+    required String remotePath,
+  }) {
+    // Store configuration values
+    _serverUrl = serverUrl;
+    _username = username;
+    _password = password;
+    _configuredRemotePath = remotePath;
+
+    _remotePath = remotePath.endsWith('/') ? remotePath : '$remotePath/';
+
+    _client = newClient(
+      serverUrl,
+      user: username,
+      password: password,
+      debug: kDebugMode,
+    );
+
+    // Save configuration to persistent storage
+    _saveConfiguration();
+  }
+
+  Future<bool> testConnection() async {
+    if (_client == null) return false;
+
+    try {
+      await _client!.ping();
+      return true;
+    } catch (e) {
+      if (kDebugMode) {
+        print('SupplementsLog: Connection test failed: $e');
+      }
+      return false;
+    }
+  }
+
+  Future<void> syncDatabase() async {
+    if (_client == null) {
+      throw Exception('Sync not configured');
+    }
+
+    _setStatus(SyncStatus.downloading);
+
+    try {
+      // Step 1: Download remote database (if it exists)
+      final remoteDbPath = await _downloadRemoteDatabase();
+
+      // Step 2: Merge databases
+      _setStatus(SyncStatus.merging);
+      await _mergeDatabases(remoteDbPath);
+
+      // Step 3: Upload merged database
+      _setStatus(SyncStatus.uploading);
+      await _uploadLocalDatabase();
+
+      // Step 4: Cleanup - for now we'll skip cleanup to avoid file issues
+      // TODO: Implement proper cleanup once file operations are working
+
+      _lastSyncTime = DateTime.now();
+      _setStatus(SyncStatus.completed);
+      onSyncCompleted?.call();
+
+    } catch (e) {
+      _lastError = e.toString();
+      _setStatus(SyncStatus.error);
+      onError?.call(_lastError!);
+      if (kDebugMode) {
+        print('SupplementsLog: Sync failed: $e');
+      }
+      rethrow;
+    }
+  }
+
+  Future<String?> _downloadRemoteDatabase() async {
+    try {
+      // Check if remote database exists
+      final files = await _client!.readDir(_remotePath!);
+      final remoteDbExists = files.any((file) => file.name == _remoteDbFileName);
+
+      if (!remoteDbExists) {
+        if (kDebugMode) {
+          print('SupplementsLog: No remote database found, will upload local database');
+        }
+        return null;
+      }
+
+      if (kDebugMode) {
+        print('SupplementsLog: Remote database found, downloading...');
+      }
+
+      // Download the remote database
+      final remoteDbBytes = await _client!.read('$_remotePath$_remoteDbFileName');
+
+      // Create a temporary file path for the downloaded database
+      final tempDir = await getDatabasesPath();
+      final tempDbPath = join(tempDir, 'remote_supplements.db');
+
+      // Write the downloaded database to a temporary file
+      final tempFile = io.File(tempDbPath);
+      await tempFile.writeAsBytes(remoteDbBytes);
+
+      if (kDebugMode) {
+        print('SupplementsLog: Downloaded remote database (${remoteDbBytes.length} bytes) to: $tempDbPath');
+      }
+
+      return tempDbPath;
+
+    } catch (e) {
+      if (kDebugMode) {
+        print('SupplementsLog: Failed to download remote database: $e');
+      }
+      return null;
+    }
+  }
+
+  Future<void> _mergeDatabases(String? remoteDbPath) async {
+    if (remoteDbPath == null) {
+      if (kDebugMode) {
+        print('SupplementsLog: No remote database to merge');
+      }
+      return;
+    }
+
+    if (kDebugMode) {
+      print('SupplementsLog: Starting database merge from: $remoteDbPath');
+    }
+
+    final localDb = await _databaseHelper.database;
+    final remoteDb = await openDatabase(remoteDbPath, readOnly: true);
+
+    try {
+      // Check what tables exist in remote database
+      if (kDebugMode) {
+        final tables = await remoteDb.rawQuery("SELECT name FROM sqlite_master WHERE type='table'");
+        print('SupplementsLog: Remote database tables: ${tables.map((t) => t['name']).toList()}');
+
+        // Count records in each table
+        try {
+          final supplementCount = await remoteDb.rawQuery('SELECT COUNT(*) as count FROM supplements');
+          print('SupplementsLog: Remote supplements count: ${supplementCount.first['count']}');
+        } catch (e) {
+          print('SupplementsLog: Error counting supplements: $e');
+        }
+
+        try {
+          final intakeCount = await remoteDb.rawQuery('SELECT COUNT(*) as count FROM supplement_intakes');
+          print('SupplementsLog: Remote intakes count: ${intakeCount.first['count']}');
+        } catch (e) {
+          print('SupplementsLog: Error counting intakes: $e');
+        }
+      }
+
+      // Merge supplements
+      await _mergeSupplements(localDb, remoteDb);
+
+      // Merge intakes
+      await _mergeIntakes(localDb, remoteDb);
+
+      if (kDebugMode) {
+        print('SupplementsLog: Database merge completed successfully');
+      }
+
+    } finally {
+      await remoteDb.close();
+    }
+  }
+
+  Future<void> _mergeSupplements(Database localDb, Database remoteDb) async {
+    if (kDebugMode) {
+      print('SupplementsLog: Starting supplement merge...');
+    }
+
+    // Get all supplements from remote database
+    final remoteMaps = await remoteDb.query('supplements');
+    final remoteSupplements =
+        remoteMaps.map((map) => Supplement.fromMap(map)).toList();
+
+    if (kDebugMode) {
+      print(
+          'SupplementsLog: Found ${remoteSupplements.length} supplements in remote database');
+      for (final supplement in remoteSupplements) {
+        print(
+            'SupplementsLog: Remote supplement: ${supplement.name} (syncId: ${supplement.syncId}, deleted: ${supplement.isDeleted})');
+      }
+    }
+
+    for (final remoteSupplement in remoteSupplements) {
+      if (remoteSupplement.syncId.isEmpty) {
+        if (kDebugMode) {
+          print(
+              'SupplementsLog: Skipping supplement ${remoteSupplement.name} - no syncId');
+        }
+        continue;
+      }
+
+      // Find existing supplement by syncId
+      final existingMaps = await localDb.query(
+        'supplements',
+        where: 'syncId = ?',
+        whereArgs: [remoteSupplement.syncId],
+      );
+
+      if (existingMaps.isEmpty) {
+        // New supplement from remote - insert it
+        if (!remoteSupplement.isDeleted) {
+          // Manually create a new map without the id to ensure it's null
+          final mapToInsert = remoteSupplement.toMap();
+          mapToInsert.remove('id');
+          await localDb.insert('supplements', mapToInsert);
+          if (kDebugMode) {
+            print(
+                'SupplementsLog: ✓ Inserted new supplement: ${remoteSupplement.name}');
+          }
+        } else {
+          if (kDebugMode) {
+            print(
+                'SupplementsLog: Skipping deleted supplement: ${remoteSupplement.name}');
+          }
+        }
+      } else {
+        // Existing supplement - update if remote is newer
+        final existingSupplement = Supplement.fromMap(existingMaps.first);
+
+        if (remoteSupplement.lastModified
+            .isAfter(existingSupplement.lastModified)) {
+          final supplementToUpdate =
+              remoteSupplement.copyWith(id: existingSupplement.id);
+          await localDb.update(
+            'supplements',
+            supplementToUpdate.toMap(),
+            where: 'id = ?',
+            whereArgs: [existingSupplement.id],
+          );
+          if (kDebugMode) {
+            print(
+                'SupplementsLog: ✓ Updated supplement: ${remoteSupplement.name}');
+          }
+        } else {
+          if (kDebugMode) {
+            print(
+                'SupplementsLog: Local supplement ${remoteSupplement.name} is newer, keeping local version');
+          }
+        }
+      }
+    }
+
+    if (kDebugMode) {
+      print('SupplementsLog: Supplement merge completed');
+    }
+  }
+
+  Future<void> _mergeIntakes(Database localDb, Database remoteDb) async {
+    if (kDebugMode) {
+      print('SupplementsLog: Starting intake merge...');
+    }
+
+    // Get all intakes from remote database
+    final remoteMaps = await remoteDb.query('supplement_intakes');
+    final remoteIntakes = remoteMaps.map((map) => SupplementIntake.fromMap(map)).toList();
+
+    if (kDebugMode) {
+      print('SupplementsLog: Found ${remoteIntakes.length} intakes in remote database');
+    }
+
+    for (final remoteIntake in remoteIntakes) {
+      if (remoteIntake.syncId.isEmpty) {
+        if (kDebugMode) {
+          print('SupplementsLog: Skipping intake - no syncId');
+        }
+        continue;
+      }
+
+      // Find existing intake by syncId
+      final existingMaps = await localDb.query(
+        'supplement_intakes',
+        where: 'syncId = ?',
+        whereArgs: [remoteIntake.syncId],
+      );
+
+      if (existingMaps.isEmpty) {
+        // New intake from remote - need to find local supplement ID
+        if (!remoteIntake.isDeleted) {
+          final localSupplementId = await _findLocalSupplementId(localDb, remoteIntake.supplementId, remoteDb);
+          if (localSupplementId != null) {
+            final intakeToInsert = remoteIntake.copyWith(
+              id: null,
+              supplementId: localSupplementId,
+            );
+            await localDb.insert('supplement_intakes', intakeToInsert.toMap());
+            if (kDebugMode) {
+              print('SupplementsLog: ✓ Inserted new intake: ${remoteIntake.syncId}');
+            }
+          } else {
+            if (kDebugMode) {
+              print('SupplementsLog: Could not find local supplement for intake ${remoteIntake.syncId}');
+            }
+          }
+        } else {
+          if (kDebugMode) {
+            print('SupplementsLog: Skipping deleted intake: ${remoteIntake.syncId}');
+          }
+        }
+      } else {
+        // Existing intake - update if remote is newer
+        final existingIntake = SupplementIntake.fromMap(existingMaps.first);
+
+        if (remoteIntake.lastModified.isAfter(existingIntake.lastModified)) {
+          final intakeToUpdate = remoteIntake.copyWith(id: existingIntake.id);
+          await localDb.update(
+            'supplement_intakes',
+            intakeToUpdate.toMap(),
+            where: 'id = ?',
+            whereArgs: [existingIntake.id],
+          );
+          if (kDebugMode) {
+            print('SupplementsLog: ✓ Updated intake: ${remoteIntake.syncId}');
+          }
+        } else {
+          if (kDebugMode) {
+            print('SupplementsLog: Local intake ${remoteIntake.syncId} is newer, keeping local version');
+          }
+        }
+      }
+    }
+
+    if (kDebugMode) {
+      print('SupplementsLog: Intake merge completed');
+    }
+  }
+
+  Future<int?> _findLocalSupplementId(Database localDb, int remoteSupplementId, Database remoteDb) async {
+    // Get the remote supplement
+    final remoteSupplementMaps = await remoteDb.query(
+      'supplements',
+      where: 'id = ?',
+      whereArgs: [remoteSupplementId],
+    );
+
+    if (remoteSupplementMaps.isEmpty) return null;
+
+    final remoteSupplement = Supplement.fromMap(remoteSupplementMaps.first);
+
+    // Find the local supplement with the same syncId
+    final localSupplementMaps = await localDb.query(
+      'supplements',
+      where: 'syncId = ?',
+      whereArgs: [remoteSupplement.syncId],
+    );
+
+    if (localSupplementMaps.isEmpty) return null;
+
+    return localSupplementMaps.first['id'] as int;
+  }
+
+  Future<void> _uploadLocalDatabase() async {
+    try {
+      // Get the local database path
+      final localDb = await _databaseHelper.database;
+      final dbPath = localDb.path;
+
+      if (kDebugMode) {
+        print('SupplementsLog: Reading database from: $dbPath');
+      }
+
+      // Read the database file
+      final dbFile = io.File(dbPath);
+      if (!await dbFile.exists()) {
+        throw Exception('Database file not found at: $dbPath');
+      }
+
+      final dbBytes = await dbFile.readAsBytes();
+
+      if (kDebugMode) {
+        print('SupplementsLog: Database file size: ${dbBytes.length} bytes');
+      }
+
+      if (dbBytes.isEmpty) {
+        throw Exception('Database file is empty');
+      }
+
+      // Ensure remote directory exists
+      try {
+        await _client!.readDir(_remotePath!);
+      } catch (e) {
+        if (kDebugMode) {
+          print('SupplementsLog: Creating remote directory: $_remotePath');
+        }
+        await _client!.mkdir(_remotePath!);
+      }
+
+      // Upload the database file
+      final remoteUrl = '$_remotePath$_remoteDbFileName';
+      await _client!.write(remoteUrl, dbBytes);
+
+      if (kDebugMode) {
+        print('SupplementsLog: Successfully uploaded database (${dbBytes.length} bytes) to: $remoteUrl');
+      }
+
+    } catch (e) {
+      if (kDebugMode) {
+        print('SupplementsLog: Failed to upload database: $e');
+      }
+      rethrow;
+    }
+  }
+
+  void _setStatus(SyncStatus status) {
+    _status = status;
+    onStatusChanged?.call(status);
+  }
+
+  void clearError() {
+    _lastError = null;
+  }
+}

lib/services/notification_service.dart

@@ -7,17 +7,17 @@ import 'database_helper.dart';
 // Top-level function to handle notification responses when app is running
 @pragma('vm:entry-point')
 void notificationTapBackground(NotificationResponse notificationResponse) {
-  print('📱 === BACKGROUND NOTIFICATION RESPONSE ===');
+  print('SupplementsLog: 📱 === BACKGROUND NOTIFICATION RESPONSE ===');
-  print('📱 Action ID: ${notificationResponse.actionId}');
+  print('SupplementsLog: 📱 Action ID: ${notificationResponse.actionId}');
-  print('📱 Payload: ${notificationResponse.payload}');
+  print('SupplementsLog: 📱 Payload: ${notificationResponse.payload}');
-  print('📱 Notification ID: ${notificationResponse.id}');
+  print('SupplementsLog: 📱 Notification ID: ${notificationResponse.id}');
-  print('📱 ==========================================');
+  print('SupplementsLog: 📱 ==========================================');
 
   // For now, just log the action. The main app handler will process it.
   if (notificationResponse.actionId == 'take_supplement') {
-    print('📱 BACKGROUND: Take action detected');
+    print('SupplementsLog: 📱 BACKGROUND: Take action detected');
   } else if (notificationResponse.actionId == 'snooze_10') {
-    print('📱 BACKGROUND: Snooze action detected');
+    print('SupplementsLog: 📱 BACKGROUND: Snooze action detected');
   }
 }
 
@@ -40,25 +40,25 @@ class NotificationService {
   }
 
   Future<void> initialize() async {
-    print('📱 Initializing NotificationService...');
+    print('SupplementsLog: 📱 Initializing NotificationService...');
     if (_isInitialized) {
-      print('📱 Already initialized');
+      print('SupplementsLog: 📱 Already initialized');
       return;
     }
 
     try {
-      print('📱 Initializing timezones...');
+      print('SupplementsLog: 📱 Initializing timezones...');
-      print('📱 Engine initialized flag: $_engineInitialized');
+      print('SupplementsLog: 📱 Engine initialized flag: $_engineInitialized');
 
       if (!_engineInitialized) {
         tz.initializeTimeZones();
         _engineInitialized = true;
-        print('📱 Timezones initialized successfully');
+        print('SupplementsLog: 📱 Timezones initialized successfully');
       } else {
-        print('📱 Timezones already initialized, skipping');
+        print('SupplementsLog: 📱 Timezones already initialized, skipping');
       }
     } catch (e) {
-      print('📱 Warning: Timezone initialization issue (may already be initialized): $e');
+      print('SupplementsLog: 📱 Warning: Timezone initialization issue (may already be initialized): $e');
       _engineInitialized = true; // Mark as initialized to prevent retry
     }
 
@@ -66,7 +66,7 @@ class NotificationService {
     try {
       // First try using the system timezone name
       final String timeZoneName = DateTime.now().timeZoneName;
-      print('📱 System timezone name: $timeZoneName');
+      print('SupplementsLog: 📱 System timezone name: $timeZoneName');
 
       tz.Location? location;
 
@@ -80,22 +80,22 @@ class NotificationService {
         try {
           location = tz.getLocation(timeZoneName);
         } catch (e) {
-          print('📱 Could not find timezone $timeZoneName, using Europe/Amsterdam as default');
+          print('SupplementsLog: 📱 Could not find timezone $timeZoneName, using Europe/Amsterdam as default');
           location = tz.getLocation('Europe/Amsterdam');
         }
       }
 
       tz.setLocalLocation(location);
-      print('📱 Timezone set to: ${location.name}');
+      print('SupplementsLog: 📱 Timezone set to: ${location.name}');
 
     } catch (e) {
-      print('📱 Error setting timezone: $e, using default');
+      print('SupplementsLog: 📱 Error setting timezone: $e, using default');
       // Fallback to a reasonable default for Netherlands
       tz.setLocalLocation(tz.getLocation('Europe/Amsterdam'));
     }
 
-    print('📱 Current local time: ${tz.TZDateTime.now(tz.local)}');
+    print('SupplementsLog: 📱 Current local time: ${tz.TZDateTime.now(tz.local)}');
-    print('📱 Current system time: ${DateTime.now()}');
+    print('SupplementsLog: 📱 Current system time: ${DateTime.now()}');
 
     const AndroidInitializationSettings androidSettings = AndroidInitializationSettings('@mipmap/ic_launcher');
     const DarwinInitializationSettings iosSettings = DarwinInitializationSettings(
@@ -113,7 +113,7 @@ class NotificationService {
       linux: linuxSettings,
     );
 
-    print('📱 Initializing flutter_local_notifications...');
+    print('SupplementsLog: 📱 Initializing flutter_local_notifications...');
     await _notifications.initialize(
       initSettings,
       onDidReceiveNotificationResponse: _onNotificationResponse,
@@ -121,42 +121,42 @@ class NotificationService {
     );
 
     // Test if notification response callback is working
-    print('📱 Callback function is set and ready');
+    print('SupplementsLog: 📱 Callback function is set and ready');
 
     _isInitialized = true;
-    print('📱 NotificationService initialization complete');
+    print('SupplementsLog: 📱 NotificationService initialization complete');
   }
 
   // Handle notification responses (when user taps on notification or action)
   void _onNotificationResponse(NotificationResponse response) {
-    print('📱 === NOTIFICATION RESPONSE ===');
+    print('SupplementsLog: 📱 === NOTIFICATION RESPONSE ===');
-    print('📱 Action ID: ${response.actionId}');
+    print('SupplementsLog: 📱 Action ID: ${response.actionId}');
-    print('📱 Payload: ${response.payload}');
+    print('SupplementsLog: 📱 Payload: ${response.payload}');
-    print('📱 Notification ID: ${response.id}');
+    print('SupplementsLog: 📱 Notification ID: ${response.id}');
-    print('📱 Input: ${response.input}');
+    print('SupplementsLog: 📱 Input: ${response.input}');
-    print('📱 ===============================');
+    print('SupplementsLog: 📱 ===============================');
 
     if (response.actionId == 'take_supplement') {
-      print('📱 Processing TAKE action...');
+      print('SupplementsLog: 📱 Processing TAKE action...');
       _handleTakeAction(response.payload, response.id);
     } else if (response.actionId == 'snooze_10') {
-      print('📱 Processing SNOOZE action...');
+      print('SupplementsLog: 📱 Processing SNOOZE action...');
       _handleSnoozeAction(response.payload, 10, response.id);
     } else {
-      print('📱 Default notification tap (no specific action)');
+      print('SupplementsLog: 📱 Default notification tap (no specific action)');
       // Default tap (no actionId) opens the app normally
     }
   }
 
   Future<void> _handleTakeAction(String? payload, int? notificationId) async {
-    print('📱 === HANDLING TAKE ACTION ===');
+    print('SupplementsLog: 📱 === HANDLING TAKE ACTION ===');
-    print('📱 Payload received: $payload');
+    print('SupplementsLog: 📱 Payload received: $payload');
 
     if (payload != null) {
       try {
         // Parse the payload to get supplement info
         final parts = payload.split('|');
-        print('📱 Payload parts: $parts (length: ${parts.length})');
+        print('SupplementsLog: 📱 Payload parts: $parts (length: ${parts.length})');
 
         if (parts.length >= 4) {
           final supplementId = int.parse(parts[0]);
@@ -164,46 +164,62 @@ class NotificationService {
           final units = double.parse(parts[2]);
           final unitType = parts[3];
 
-          print('📱 Parsed data:');
+          print('SupplementsLog: 📱 Parsed data:');
-          print('📱   - ID: $supplementId');
+          print('SupplementsLog: 📱   - ID: $supplementId');
-          print('📱   - Name: $supplementName');
+          print('SupplementsLog: 📱   - Name: $supplementName');
-          print('📱   - Units: $units');
+          print('SupplementsLog: 📱   - Units: $units');
-          print('📱   - Type: $unitType');
+          print('SupplementsLog: 📱   - Type: $unitType');
 
           // Call the callback to record the intake
           if (_onTakeSupplementCallback != null) {
-            print('📱 Calling supplement callback...');
+            print('SupplementsLog: 📱 Calling supplement callback...');
-            _onTakeSupplementCallback!(supplementId, supplementName, units, unitType);
+            _onTakeSupplementCallback!(
-            print('📱 Callback completed');
+                supplementId, supplementName, units, unitType);
+            print('SupplementsLog: 📱 Callback completed');
           } else {
-            print('📱 ERROR: No callback registered!');
+            print('SupplementsLog: 📱 ERROR: No callback registered!');
+          }
+
+          // For retry notifications, the original notification ID is in the payload
+          int originalNotificationId;
+          if (parts.length > 4 && int.tryParse(parts[4]) != null) {
+            originalNotificationId = int.parse(parts[4]);
+            print(
+                'SupplementsLog: 📱 Retry notification detected. Original ID: $originalNotificationId');
+          } else if (notificationId != null) {
+            originalNotificationId = notificationId;
+          } else {
+            print(
+                'SupplementsLog: 📱 ERROR: Could not determine notification ID to cancel.');
+            return;
           }
 
           // Mark notification as taken in database (this will cancel any pending retries)
-          if (notificationId != null) {
+          print(
-            print('📱 Marking notification $notificationId as taken');
+              'SupplementsLog: 📱 Marking notification $originalNotificationId as taken');
-            await DatabaseHelper.instance.markNotificationTaken(notificationId);
+          await DatabaseHelper.instance
+              .markNotificationTaken(originalNotificationId);
 
-            // Cancel any pending retry notifications for this notification
+          // Cancel any pending retry notifications for this notification
-            _cancelRetryNotifications(notificationId);
+          _cancelRetryNotifications(originalNotificationId);
-          }
 
           // Show a confirmation notification
-          print('📱 Showing confirmation notification...');
+          print('SupplementsLog: 📱 Showing confirmation notification...');
           showInstantNotification(
             'Supplement Taken!',
             '$supplementName has been recorded at ${DateTime.now().hour.toString().padLeft(2, '0')}:${DateTime.now().minute.toString().padLeft(2, '0')}',
           );
         } else {
-          print('📱 ERROR: Invalid payload format - not enough parts');
+          print(
+              'SupplementsLog: 📱 ERROR: Invalid payload format - not enough parts');
         }
       } catch (e) {
-        print('📱 ERROR in _handleTakeAction: $e');
+        print('SupplementsLog: 📱 ERROR in _handleTakeAction: $e');
       }
     } else {
-      print('📱 ERROR: Payload is null');
+      print('SupplementsLog: 📱 ERROR: Payload is null');
     }
-    print('📱 === TAKE ACTION COMPLETE ===');
+    print('SupplementsLog: 📱 === TAKE ACTION COMPLETE ===');
   }
 
   void _cancelRetryNotifications(int notificationId) {
@@ -211,13 +227,13 @@ class NotificationService {
     for (int i = 0; i < 10; i++) { // Cancel up to 10 potential retries
       int retryId = 200000 + (notificationId * 10) + i;
       _notifications.cancel(retryId);
-      print('📱 Cancelled retry notification ID: $retryId');
+      print('SupplementsLog: 📱 Cancelled retry notification ID: $retryId');
     }
   }
 
   void _handleSnoozeAction(String? payload, int minutes, int? notificationId) {
-    print('📱 === HANDLING SNOOZE ACTION ===');
+    print('SupplementsLog: 📱 === HANDLING SNOOZE ACTION ===');
-    print('📱 Payload: $payload, Minutes: $minutes');
+    print('SupplementsLog: 📱 Payload: $payload, Minutes: $minutes');
 
     if (payload != null) {
       try {
@@ -226,17 +242,17 @@ class NotificationService {
           final supplementId = int.parse(parts[0]);
           final supplementName = parts[1];
 
-          print('📱 Snoozing supplement for $minutes minutes: $supplementName');
+          print('SupplementsLog: 📱 Snoozing supplement for $minutes minutes: $supplementName');
 
           // Mark notification as snoozed in database (increment retry count)
           if (notificationId != null) {
-            print('📱 Incrementing retry count for notification $notificationId');
+            print('SupplementsLog: 📱 Incrementing retry count for notification $notificationId');
             DatabaseHelper.instance.incrementRetryCount(notificationId);
           }
 
           // Schedule a new notification for the snooze time
           final snoozeTime = tz.TZDateTime.now(tz.local).add(Duration(minutes: minutes));
-          print('📱 Snooze time: $snoozeTime');
+          print('SupplementsLog: 📱 Snooze time: $snoozeTime');
 
           _notifications.zonedSchedule(
             supplementId * 1000 + minutes, // Unique ID for snooze notifications
@@ -271,13 +287,13 @@ class NotificationService {
             'Reminder Snoozed',
             '$supplementName reminder snoozed for $minutes minutes',
           );
-          print('📱 Snooze scheduled successfully');
+          print('SupplementsLog: 📱 Snooze scheduled successfully');
         }
       } catch (e) {
-        print('📱 Error handling snooze action: $e');
+        print('SupplementsLog: 📱 Error handling snooze action: $e');
       }
     }
-    print('📱 === SNOOZE ACTION COMPLETE ===');
+    print('SupplementsLog: 📱 === SNOOZE ACTION COMPLETE ===');
   }
 
   /// Check for persistent reminders from app context with settings
@@ -299,19 +315,19 @@ class NotificationService {
     required int reminderRetryInterval,
     required int maxRetryAttempts,
   }) async {
-    print('📱 Checking for pending notifications to retry...');
+    print('SupplementsLog: 📱 Checking for pending notifications to retry...');
 
     try {
       if (!persistentReminders) {
-        print('📱 Persistent reminders disabled');
+        print('SupplementsLog: 📱 Persistent reminders disabled');
         return;
       }
 
-      print('📱 Retry settings: interval=$reminderRetryInterval min, max=$maxRetryAttempts attempts');
+      print('SupplementsLog: 📱 Retry settings: interval=$reminderRetryInterval min, max=$maxRetryAttempts attempts');
 
       // Get all pending notifications from database
       final pendingNotifications = await DatabaseHelper.instance.getPendingNotifications();
-      print('📱 Found ${pendingNotifications.length} pending notifications');
+      print('SupplementsLog: 📱 Found ${pendingNotifications.length} pending notifications');
 
       final now = DateTime.now();
 
@@ -326,17 +342,17 @@ class NotificationService {
         final timeSinceScheduled = now.difference(scheduledTime).inMinutes;
         final shouldRetry = timeSinceScheduled >= reminderRetryInterval;
 
-        print('📱 Checking notification ${notification['notificationId']}:');
+        print('SupplementsLog: 📱 Checking notification ${notification['notificationId']}:');
-        print('📱   Scheduled: $scheduledTime (local)');
+        print('SupplementsLog: 📱   Scheduled: $scheduledTime (local)');
-        print('📱   Now: $now');
+        print('SupplementsLog: 📱   Now: $now');
-        print('📱   Time since scheduled: $timeSinceScheduled minutes');
+        print('SupplementsLog: 📱   Time since scheduled: $timeSinceScheduled minutes');
-        print('📱   Retry interval: $reminderRetryInterval minutes');
+        print('SupplementsLog: 📱   Retry interval: $reminderRetryInterval minutes');
-        print('📱   Should retry: $shouldRetry');
+        print('SupplementsLog: 📱   Should retry: $shouldRetry');
-        print('📱   Retry count: $retryCount / $maxRetryAttempts');
+        print('SupplementsLog: 📱   Retry count: $retryCount / $maxRetryAttempts');
 
         // Check if we haven't exceeded max retry attempts
         if (retryCount >= maxRetryAttempts) {
-          print('📱 Notification ${notification['notificationId']} exceeded max attempts ($maxRetryAttempts)');
+          print('SupplementsLog: 📱 Notification ${notification['notificationId']} exceeded max attempts ($maxRetryAttempts)');
           continue;
         }
 
@@ -344,20 +360,20 @@ class NotificationService {
         if (lastRetryTime != null) {
           final timeSinceLastRetry = now.difference(lastRetryTime).inMinutes;
           if (timeSinceLastRetry < reminderRetryInterval) {
-            print('📱 Notification ${notification['notificationId']} not ready for retry yet');
+            print('SupplementsLog: 📱 Notification ${notification['notificationId']} not ready for retry yet');
             continue;
           }
         }
 
         if (shouldRetry) {
-          print('📱 ⚡ SCHEDULING RETRY for notification ${notification['notificationId']}');
+          print('SupplementsLog: 📱 ⚡ SCHEDULING RETRY for notification ${notification['notificationId']}');
           await _scheduleRetryNotification(notification, retryCount + 1);
         } else {
-          print('📱 ⏸️  NOT READY FOR RETRY: ${notification['notificationId']}');
+          print('SupplementsLog: 📱 ⏸️  NOT READY FOR RETRY: ${notification['notificationId']}');
         }
       }
     } catch (e) {
-      print('📱 Error scheduling persistent reminders: $e');
+      print('SupplementsLog: 📱 Error scheduling persistent reminders: $e');
     }
   }
 
@@ -369,7 +385,7 @@ class NotificationService {
       // Generate a unique ID for this retry (200000 + original_id * 10 + retry_attempt)
       final retryNotificationId = 200000 + (notificationId * 10) + retryAttempt;
 
-      print('📱 Scheduling retry notification $retryNotificationId for supplement $supplementId (attempt $retryAttempt)');
+      print('SupplementsLog: 📱 Scheduling retry notification $retryNotificationId for supplement $supplementId (attempt $retryAttempt)');
 
       // Get supplement details from database
       final supplements = await DatabaseHelper.instance.getAllSupplements();
@@ -408,16 +424,16 @@ class NotificationService {
       // Update the retry count in database
       await DatabaseHelper.instance.incrementRetryCount(notificationId);
 
-      print('📱 Retry notification scheduled successfully');
+      print('SupplementsLog: 📱 Retry notification scheduled successfully');
     } catch (e) {
-      print('📱 Error scheduling retry notification: $e');
+      print('SupplementsLog: 📱 Error scheduling retry notification: $e');
     }
   }
 
   Future<bool> requestPermissions() async {
-    print('📱 Requesting notification permissions...');
+    print('SupplementsLog: 📱 Requesting notification permissions...');
     if (_permissionsRequested) {
-      print('📱 Permissions already requested');
+      print('SupplementsLog: 📱 Permissions already requested');
       return true;
     }
 
@@ -426,9 +442,9 @@ class NotificationService {
 
       final androidPlugin = _notifications.resolvePlatformSpecificImplementation<AndroidFlutterLocalNotificationsPlugin>();
       if (androidPlugin != null) {
-        print('📱 Requesting Android permissions...');
+        print('SupplementsLog: 📱 Requesting Android permissions...');
         final granted = await androidPlugin.requestNotificationsPermission();
-        print('📱 Android permissions granted: $granted');
+        print('SupplementsLog: 📱 Android permissions granted: $granted');
         if (granted != true) {
           _permissionsRequested = false;
           return false;
@@ -437,31 +453,31 @@ class NotificationService {
 
       final iosPlugin = _notifications.resolvePlatformSpecificImplementation<IOSFlutterLocalNotificationsPlugin>();
       if (iosPlugin != null) {
-        print('📱 Requesting iOS permissions...');
+        print('SupplementsLog: 📱 Requesting iOS permissions...');
         final granted = await iosPlugin.requestPermissions(
           alert: true,
           badge: true,
           sound: true,
         );
-        print('📱 iOS permissions granted: $granted');
+        print('SupplementsLog: 📱 iOS permissions granted: $granted');
         if (granted != true) {
           _permissionsRequested = false;
           return false;
         }
       }
 
-      print('📱 All permissions granted successfully');
+      print('SupplementsLog: 📱 All permissions granted successfully');
       return true;
     } catch (e) {
       _permissionsRequested = false;
-      print('📱 Error requesting permissions: $e');
+      print('SupplementsLog: 📱 Error requesting permissions: $e');
       return false;
     }
   }
 
   Future<void> scheduleSupplementReminders(Supplement supplement) async {
-    print('📱 Scheduling reminders for ${supplement.name}');
+    print('SupplementsLog: 📱 Scheduling reminders for ${supplement.name}');
-    print('📱 Reminder times: ${supplement.reminderTimes}');
+    print('SupplementsLog: 📱 Reminder times: ${supplement.reminderTimes}');
 
     // Cancel existing notifications for this supplement
     await cancelSupplementReminders(supplement.id!);
@@ -475,7 +491,7 @@ class NotificationService {
       final notificationId = supplement.id! * 100 + i; // Unique ID for each reminder
       final scheduledTime = _nextInstanceOfTime(hour, minute);
 
-      print('📱 Scheduling notification ID $notificationId for ${timeStr} -> ${scheduledTime}');
+      print('SupplementsLog: 📱 Scheduling notification ID $notificationId for ${timeStr} -> ${scheduledTime}');
 
       // Track this notification in the database
       await DatabaseHelper.instance.trackNotification(
@@ -518,14 +534,14 @@ class NotificationService {
         payload: '${supplement.id}|${supplement.name}|${supplement.numberOfUnits}|${supplement.unitType}',
       );
 
-      print('📱 Successfully scheduled notification ID $notificationId');
+      print('SupplementsLog: 📱 Successfully scheduled notification ID $notificationId');
     }
 
     // Get all pending notifications to verify
     final pendingNotifications = await _notifications.pendingNotificationRequests();
-    print('📱 Total pending notifications: ${pendingNotifications.length}');
+    print('SupplementsLog: 📱 Total pending notifications: ${pendingNotifications.length}');
     for (final notification in pendingNotifications) {
-      print('📱 Pending: ID=${notification.id}, Title=${notification.title}');
+      print('SupplementsLog: 📱 Pending: ID=${notification.id}, Title=${notification.title}');
     }
   }
 
@@ -548,22 +564,22 @@ class NotificationService {
     final tz.TZDateTime now = tz.TZDateTime.now(tz.local);
     tz.TZDateTime scheduledDate = tz.TZDateTime(tz.local, now.year, now.month, now.day, hour, minute);
 
-    print('📱 Current time: $now (${now.timeZoneName})');
+    print('SupplementsLog: 📱 Current time: $now (${now.timeZoneName})');
-    print('📱 Target time: ${hour.toString().padLeft(2, '0')}:${minute.toString().padLeft(2, '0')}');
+    print('SupplementsLog: 📱 Target time: ${hour.toString().padLeft(2, '0')}:${minute.toString().padLeft(2, '0')}');
-    print('📱 Initial scheduled date: $scheduledDate (${scheduledDate.timeZoneName})');
+    print('SupplementsLog: 📱 Initial scheduled date: $scheduledDate (${scheduledDate.timeZoneName})');
 
     if (scheduledDate.isBefore(now)) {
       scheduledDate = scheduledDate.add(const Duration(days: 1));
-      print('📱 Time has passed, scheduling for tomorrow: $scheduledDate (${scheduledDate.timeZoneName})');
+      print('SupplementsLog: 📱 Time has passed, scheduling for tomorrow: $scheduledDate (${scheduledDate.timeZoneName})');
     } else {
-      print('📱 Time is in the future, scheduling for today: $scheduledDate (${scheduledDate.timeZoneName})');
+      print('SupplementsLog: 📱 Time is in the future, scheduling for today: $scheduledDate (${scheduledDate.timeZoneName})');
     }
 
     return scheduledDate;
   }
 
   Future<void> showInstantNotification(String title, String body) async {
-    print('📱 Showing instant notification: $title - $body');
+    print('SupplementsLog: 📱 Showing instant notification: $title - $body');
     const NotificationDetails notificationDetails = NotificationDetails(
       android: AndroidNotificationDetails(
         'instant_notifications',
@@ -581,22 +597,22 @@ class NotificationService {
       body,
       notificationDetails,
     );
-    print('📱 Instant notification sent');
+    print('SupplementsLog: 📱 Instant notification sent');
   }
 
   // Debug function to test notifications
   Future<void> testNotification() async {
-    print('📱 Testing notification system...');
+    print('SupplementsLog: 📱 Testing notification system...');
     await showInstantNotification('Test Notification', 'This is a test notification to verify the system is working.');
   }
 
   // Debug function to schedule a test notification 1 minute from now
   Future<void> testScheduledNotification() async {
-    print('📱 Testing scheduled notification...');
+    print('SupplementsLog: 📱 Testing scheduled notification...');
     final now = tz.TZDateTime.now(tz.local);
     final testTime = now.add(const Duration(minutes: 1));
 
-    print('📱 Scheduling test notification for: $testTime');
+    print('SupplementsLog: 📱 Scheduling test notification for: $testTime');
 
     await _notifications.zonedSchedule(
       99999, // Special ID for test notifications
@@ -616,7 +632,7 @@ class NotificationService {
       androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
     );
 
-    print('📱 Test notification scheduled successfully');
+    print('SupplementsLog: 📱 Test notification scheduled successfully');
   }
 
   // Debug function to get all pending notifications
@@ -626,7 +642,7 @@ class NotificationService {
 
   // Debug function to test notification actions
   Future<void> testNotificationWithActions() async {
-    print('📱 Creating test notification with actions...');
+    print('SupplementsLog: 📱 Creating test notification with actions...');
 
     await _notifications.show(
       88888, // Special test ID
@@ -659,12 +675,12 @@ class NotificationService {
       payload: '999|Test Supplement|1.0|capsule',
     );
 
-    print('📱 Test notification with actions created');
+    print('SupplementsLog: 📱 Test notification with actions created');
   }
 
   // Debug function to test basic notification tap response
   Future<void> testBasicNotification() async {
-    print('📱 Creating basic test notification...');
+    print('SupplementsLog: 📱 Creating basic test notification...');
 
     await _notifications.show(
       77777, // Special test ID for basic notification
@@ -683,6 +699,6 @@ class NotificationService {
       payload: 'basic_test',
     );
 
-    print('📱 Basic test notification created');
+    print('SupplementsLog: 📱 Basic test notification created');
   }
 }

lib/services/nutrient_data_service.dart

@@ -0,0 +1,40 @@
+import 'dart:convert';
+
+import 'package:flutter/services.dart';
+
+import '../models/nutrient.dart';
+
+class NutrientDataService {
+  static final NutrientDataService _instance = NutrientDataService._internal();
+
+  factory NutrientDataService() {
+    return _instance;
+  }
+
+  NutrientDataService._internal();
+
+  List<Nutrient>? _nutrients;
+
+  Future<List<Nutrient>> get nutrients async {
+    if (_nutrients != null) {
+      return _nutrients!;
+    }
+    await _loadNutrientData();
+    return _nutrients!;
+  }
+
+  Future<void> _loadNutrientData() async {
+    try {
+      final String response = await rootBundle.loadString('assets/canada_health.json');
+      final data = await json.decode(response);
+      final nutrientsData = data['nutrients'] as Map<String, dynamic>;
+
+      _nutrients = nutrientsData.entries.map((entry) {
+        return Nutrient.fromJson(entry.key, entry.value);
+      }).toList();
+    } catch (e) {
+      print('Error loading nutrient data: $e');
+      _nutrients = [];
+    }
+  }
+}

lib/services/rda_service.dart

@@ -0,0 +1,617 @@
+import 'dart:async';
+import 'dart:math';
+
+import '../models/ingredient.dart';
+import '../models/nutrient.dart';
+import 'nutrient_data_service.dart';
+
+/// Represents an RDA/AI match for a user and nutrient
+class RdaResult {
+  final String nutrientKey;
+  final String unitLabel; // e.g., "mg/day", "µg/day (RAE)"
+  final String rdaType; // "RDA/AI" or "AI"
+  final double value; // RDA/AI value in the units of unitLabel
+  final double? valueMin; // Optional minimum recommended value
+  final double? valueMax; // Optional maximum recommended value
+  final double? ul; // Upper limit (if provided) in the same base units as unitLabel (life-stage)
+  final String matchedLifeStageLabel; // e.g., "19-30 y", "51-70 y"
+  final String? lifeStageDescription; // Optional description for the life stage (e.g., maintenance/loading)
+  final UpperLimit? nutrientUl; // Nutrient-level UL (object with unit/duration/note), if available
+  final String? note; // Optional dataset note (e.g., magnesium UL is supplemental only)
+
+  const RdaResult({
+    required this.nutrientKey,
+    required this.unitLabel,
+    required this.rdaType,
+    required this.value,
+    this.valueMin,
+    this.valueMax,
+    required this.ul,
+    required this.matchedLifeStageLabel,
+    this.lifeStageDescription,
+    this.nutrientUl,
+    this.note,
+  });
+}
+
+/// Aggregated daily overview by nutrient
+class RdaAggregate {
+  final String nutrientKey;
+  final String unitLabel; // RDA unit label
+  final double rdaValue; // Midpoint of range when available
+  final double? rdaValueMin; // Optional minimum recommended value
+  final double? rdaValueMax; // Optional maximum recommended value
+  final double? ulValue;
+  final double totalAmountInRdaUnit; // Total intake converted to RDA units
+  final double percentOfRda; // 0..100+ (may exceed 100)
+  final double? percentOfUl; // 0..100+ (may exceed 100)
+  final String? matchedLifeStageLabel; // e.g., "19-30 y"
+  final String? matchedLifeStageDescription; // Optional description for the life stage
+  final String? rdaType; // e.g., "RDA/AI" or "AI"
+  final UpperLimit? nutrientUl; // Nutrient-level UL object (unit/duration/note)
+  final String? note; // Optional dataset note
+
+  const RdaAggregate({
+    required this.nutrientKey,
+    required this.unitLabel,
+    required this.rdaValue,
+    this.rdaValueMin,
+    this.rdaValueMax,
+    required this.ulValue,
+    required this.totalAmountInRdaUnit,
+    required this.percentOfRda,
+    required this.percentOfUl,
+    this.matchedLifeStageLabel,
+    this.matchedLifeStageDescription,
+    this.rdaType,
+    this.nutrientUl,
+    this.note,
+  });
+}
+
+/// Service for working with Health Canada DRIs (RDA/AI and UL)
+/// - Maps app ingredient names to nutrient keys in canada_health.json
+/// - Computes user-specific RDA/AI and UL values based on age and gender
+/// - Converts units and calculates % of RDA/AI and % of UL
+class RdaService {
+  RdaService._internal();
+
+  static final RdaService _instance = RdaService._internal();
+
+  factory RdaService() => _instance;
+
+  final NutrientDataService _nutrientDataService = NutrientDataService();
+
+  // Cache nutrients by key: e.g., "vitamin_d"
+  Map<String, Nutrient>? _nutrientsByKey;
+
+  // Known alias mapping for common ingredient names to nutrient keys
+  // Keys must be lowercase for matching
+  static const Map<String, String> _aliasToNutrientKey = {
+    // Vitamin C
+    'vitamin c': 'vitamin_c',
+    'ascorbic acid': 'vitamin_c',
+
+    // Vitamin D
+    'vitamin d': 'vitamin_d',
+    'vitamin d3': 'vitamin_d',
+    'cholecalciferol': 'vitamin_d',
+    'vitamin d2': 'vitamin_d', // ergocalciferol - treat same RDA
+
+    // Vitamin A (RAE)
+    'vitamin a': 'vitamin_a',
+    'retinol': 'vitamin_a',
+    'beta-carotene': 'vitamin_a',
+
+    // Vitamin E (alpha-tocopherol)
+    'vitamin e': 'vitamin_e',
+    'alpha tocopherol': 'vitamin_e',
+    'alpha-tocopherol': 'vitamin_e',
+
+    // Vitamin K (K1/K2 common mapping to total Vitamin K AI)
+    'vitamin k': 'vitamin_k',
+    'vitamin k1': 'vitamin_k',
+    'phylloquinone': 'vitamin_k',
+    'vitamin k2': 'vitamin_k',
+    'menaquinone': 'vitamin_k',
+
+    // B1 (Thiamine)
+    'vitamin b1': 'vitamin_b1',
+    'thiamine': 'vitamin_b1',
+    'thiamin': 'vitamin_b1',
+
+    // B2 (Riboflavin)
+    'vitamin b2': 'vitamin_b2',
+    'riboflavin': 'vitamin_b2',
+
+    // Folate
+    'folate': 'folate_dfe',
+    'folic acid': 'folate_dfe',
+    'folate (dfe)': 'folate_dfe',
+    'dfe': 'folate_dfe',
+  };
+
+  // RDA result and aggregate types moved to top-level (Dart doesn't support nested classes)
+
+  /// Get a user-specific RDA result for a given ingredient name.
+  /// - Resolves the ingredient to a nutrient key using aliases and simple heuristics.
+  /// - Computes the appropriate life-stage record based on age and gender.
+  ///
+  /// If the ingredient doesn't map to a known nutrient or no life stage matches,
+  /// returns null.
+  Future<RdaResult?> getUserRdaForIngredient(
+    String ingredientName, {
+    DateTime? dateOfBirth,
+    String? gender, // expected values similar to ['Male','Female','Other','Prefer not to say']
+  }) async {
+    final key = await mapIngredientToNutrientKey(ingredientName);
+    if (key == null) return null;
+    return getUserRdaForNutrientKey(
+      key,
+      dateOfBirth: dateOfBirth,
+      gender: gender,
+    );
+  }
+
+  /// Get a user-specific RDA result for a known nutrient key
+  /// e.g., "vitamin_d", "vitamin_c".
+  Future<RdaResult?> getUserRdaForNutrientKey(
+    String nutrientKey, {
+    DateTime? dateOfBirth,
+    String? gender,
+  }) async {
+    final nutrient = await _getNutrientByKey(nutrientKey);
+    if (nutrient == null) return null;
+
+    final _UserProfile profile = _UserProfile.from(dateOfBirth: dateOfBirth, gender: gender);
+    final LifeStage? stage = _matchLifeStageForProfile(nutrient.lifeStages, profile);
+
+    if (stage == null) return null;
+
+    return RdaResult(
+      nutrientKey: nutrientKey,
+      unitLabel: nutrient.unit,
+      rdaType: nutrient.rdaType,
+      value: stage.value,
+      valueMin: stage.valueMin,
+      valueMax: stage.valueMax,
+      ul: stage.ul,
+      matchedLifeStageLabel: stage.ageRange,
+      lifeStageDescription: stage.description,
+      nutrientUl: nutrient.ul,
+      note: nutrient.note,
+    );
+  }
+
+  /// Compute % of RDA and % of UL for a single ingredient dose.
+  /// - Resolves ingredient to nutrient key
+  /// - Converts the amount+unit to the RDA unit base for that nutrient
+  /// - Calculates percent of RDA and UL
+  ///
+  /// Returns null if the ingredient cannot be mapped or units cannot be converted.
+  Future<RdaAggregate?> computePercentForDose(
+    String ingredientName,
+    double amount,
+    String unit, {
+    DateTime? dateOfBirth,
+    String? gender,
+  }) async {
+    final rda = await getUserRdaForIngredient(
+      ingredientName,
+      dateOfBirth: dateOfBirth,
+      gender: gender,
+    );
+    if (rda == null) return null;
+
+    final String rdaUnitSymbol = _unitSymbolFromLabel(rda.unitLabel); // "mg" or "ug"
+    final String normalizedInputUnit = _normalizeUnit(unit);
+
+    final double? amountInRdaUnit = _convertAmountToTargetUnit(
+      ingredientName: ingredientName,
+      amount: amount,
+      fromUnit: normalizedInputUnit,
+      toUnit: rdaUnitSymbol,
+    );
+
+    if (amountInRdaUnit == null) return null;
+
+    final double rdaForCalc = (rda.valueMin != null && rda.valueMax != null)
+        ? ((rda.valueMin! + rda.valueMax!) / 2.0)
+        : rda.value;
+    final double percentOfRda = (amountInRdaUnit / rdaForCalc) * 100.0;
+    final double? percentOfUl =
+        rda.ul != null && rda.ul! > 0 ? (amountInRdaUnit / rda.ul!) * 100.0 : null;
+
+    return RdaAggregate(
+      nutrientKey: rda.nutrientKey,
+      unitLabel: rda.unitLabel,
+      rdaValue: rdaForCalc,
+      rdaValueMin: rda.valueMin,
+      rdaValueMax: rda.valueMax,
+      ulValue: rda.ul,
+      totalAmountInRdaUnit: amountInRdaUnit,
+      percentOfRda: percentOfRda,
+      percentOfUl: percentOfUl,
+      matchedLifeStageLabel: rda.matchedLifeStageLabel,
+      matchedLifeStageDescription: rda.lifeStageDescription,
+      rdaType: rda.rdaType,
+      nutrientUl: rda.nutrientUl,
+      note: rda.note,
+    );
+  }
+
+  /// Aggregate multiple ingredients (e.g., full-day intake) into user-specific RDA overview.
+  /// - Sums all ingredients mapped to the same nutrient
+  /// - Converts units to the RDA base unit
+  /// - Returns map keyed by nutrientKey
+  Future<Map<String, RdaAggregate>> aggregateDailyIntake(
+    List<Ingredient> ingredients, {
+    DateTime? dateOfBirth,
+    String? gender,
+  }) async {
+    final Map<String, double> totalsByNutrient = {};
+    final Map<String, RdaResult> rdaByNutrient = {};
+
+    for (final ing in ingredients) {
+      final key = await mapIngredientToNutrientKey(ing.name);
+      if (key == null) continue;
+
+      // Ensure RDA is loaded for the nutrient
+      rdaByNutrient[key] = rdaByNutrient[key] ??
+          (await getUserRdaForNutrientKey(key, dateOfBirth: dateOfBirth, gender: gender))!;
+
+      final rda = rdaByNutrient[key];
+      if (rda == null) continue; // no match for this nutrient
+
+      final String rdaUnitSymbol = _unitSymbolFromLabel(rda.unitLabel);
+      final double? converted = _convertAmountToTargetUnit(
+        ingredientName: ing.name,
+        amount: ing.amount,
+        fromUnit: _normalizeUnit(ing.unit),
+        toUnit: rdaUnitSymbol,
+      );
+      if (converted == null) continue;
+
+      totalsByNutrient[key] = (totalsByNutrient[key] ?? 0.0) + converted;
+    }
+
+    final Map<String, RdaAggregate> result = {};
+    for (final entry in totalsByNutrient.entries) {
+      final key = entry.key;
+      final total = entry.value;
+      final rda = rdaByNutrient[key];
+      if (rda == null) continue;
+      final double rdaForCalc = (rda.valueMin != null && rda.valueMax != null)
+          ? ((rda.valueMin! + rda.valueMax!) / 2.0)
+          : rda.value;
+      final double percentOfRda = (total / rdaForCalc) * 100.0;
+      final double? percentOfUl = rda.ul != null && rda.ul! > 0 ? (total / rda.ul!) * 100.0 : null;
+
+      result[key] = RdaAggregate(
+        nutrientKey: key,
+        unitLabel: rda.unitLabel,
+        rdaValue: rdaForCalc,
+        rdaValueMin: rda.valueMin,
+        rdaValueMax: rda.valueMax,
+        ulValue: rda.ul,
+        totalAmountInRdaUnit: total,
+        percentOfRda: percentOfRda,
+        percentOfUl: percentOfUl,
+        matchedLifeStageLabel: rda.matchedLifeStageLabel,
+        matchedLifeStageDescription: rda.lifeStageDescription,
+        rdaType: rda.rdaType,
+        nutrientUl: rda.nutrientUl,
+        note: rda.note,
+      );
+    }
+
+    return result;
+  }
+
+  /// Map an ingredient name (e.g., "Vitamin D3") to a nutrient key (e.g., "vitamin_d") used in canada_health.json
+  /// Returns null if no mapping is found.
+  Future<String?> mapIngredientToNutrientKey(String ingredientName) async {
+    await _ensureNutrientsLoaded();
+
+    final String cleaned = _normalizeIngredientName(ingredientName);
+
+    // Direct alias mapping
+    final direct = _aliasToNutrientKey[cleaned];
+    if (direct != null && _nutrientsByKey!.containsKey(direct)) return direct;
+
+    // Heuristic contains-based mapping
+    if (cleaned.contains('vitamin d')) return _nutrientsByKey!.containsKey('vitamin_d') ? 'vitamin_d' : null;
+    if (cleaned.contains('vitamin c')) return _nutrientsByKey!.containsKey('vitamin_c') ? 'vitamin_c' : null;
+    if (cleaned.contains('vitamin a') || cleaned.contains('retinol') || cleaned.contains('beta carotene')) {
+      return _nutrientsByKey!.containsKey('vitamin_a') ? 'vitamin_a' : null;
+    }
+    if (cleaned.contains('vitamin e') || cleaned.contains('alpha tocopherol') || cleaned.contains('alpha-tocopherol')) {
+      return _nutrientsByKey!.containsKey('vitamin_e') ? 'vitamin_e' : null;
+    }
+    if (cleaned.contains('vitamin k') || cleaned.contains('phylloquinone') || cleaned.contains('menaquinone')) {
+      return _nutrientsByKey!.containsKey('vitamin_k') ? 'vitamin_k' : null;
+    }
+    if (cleaned.contains('b1') || cleaned.contains('thiamin') || cleaned.contains('thiamine')) {
+      return _nutrientsByKey!.containsKey('vitamin_b1') ? 'vitamin_b1' : null;
+    }
+    if (cleaned.contains('b2') || cleaned.contains('riboflavin')) {
+      return _nutrientsByKey!.containsKey('vitamin_b2') ? 'vitamin_b2' : null;
+    }
+    if (cleaned.contains('folate') || cleaned.contains('folic')) {
+      return _nutrientsByKey!.containsKey('folate_dfe') ? 'folate_dfe' : null;
+    }
+    if (cleaned.contains('vitamin b3') || cleaned.contains('niacin') || cleaned.contains('nicotinic acid') || cleaned.contains('niacinamide')) {
+      return _nutrientsByKey!.containsKey('vitamin_b3') ? 'vitamin_b3' : null;
+    }
+    if (cleaned.contains('vitamin b5') || cleaned.contains('pantothenic')) {
+      return _nutrientsByKey!.containsKey('vitamin_b5') ? 'vitamin_b5' : null;
+    }
+    if (cleaned.contains('vitamin b6') || cleaned.contains('pyridoxine')) {
+      return _nutrientsByKey!.containsKey('vitamin_b6') ? 'vitamin_b6' : null;
+    }
+    if (cleaned.contains('vitamin b12') || cleaned.contains('cobalamin') || cleaned.contains('cyanocobalamin') || cleaned.contains('methylcobalamin')) {
+      return _nutrientsByKey!.containsKey('vitamin_b12') ? 'vitamin_b12' : null;
+    }
+    if (cleaned.contains('magnesium')) {
+      return _nutrientsByKey!.containsKey('magnesium') ? 'magnesium' : null;
+    }
+    if (cleaned.contains('zinc') || cleaned == 'zn') {
+      return _nutrientsByKey!.containsKey('zinc') ? 'zinc' : null;
+    }
+    if (cleaned.contains('iron') || cleaned.contains('ferrous') || cleaned.contains('ferric')) {
+      return _nutrientsByKey!.containsKey('iron') ? 'iron' : null;
+    }
+    if (cleaned.contains('creatine') || cleaned.contains('creapure') || cleaned.contains('creatine monohydrate')) {
+      return _nutrientsByKey!.containsKey('creatine') ? 'creatine' : null;
+    }
+
+    return null;
+  }
+
+  // -----------------------
+  // Internal helpers
+  // -----------------------
+
+  Future<void> _ensureNutrientsLoaded() async {
+    if (_nutrientsByKey != null) return;
+    final list = await _nutrientDataService.nutrients;
+    _nutrientsByKey = {for (final n in list) n.name: n};
+  }
+
+  Future<Nutrient?> _getNutrientByKey(String key) async {
+    await _ensureNutrientsLoaded();
+    return _nutrientsByKey![key];
+  }
+
+  // Normalize units (user input and stored ingredients)
+  // Supported return values: "mg", "ug", "g", "iu", others returned as lowercased original (e.g., "ml")
+  String _normalizeUnit(String unit) {
+    final u = unit.trim().toLowerCase();
+    if (u == 'mg') return 'mg';
+    if (u == 'g' || u == 'gram' || u == 'grams') return 'g';
+    if (u == 'µg' || u == 'μg' || u == 'mcg' || u == 'ug' || u == 'microgram' || u == 'micrograms') return 'ug';
+    if (u == 'iu') return 'iu';
+    return u; // e.g., "ml", "drops" etc. (unhandled for RDA calc)
+  }
+
+  // Extract the base unit symbol ("mg" or "ug") from the dataset unit label (e.g., "µg/day (RAE)")
+  String _unitSymbolFromLabel(String label) {
+    final lower = label.toLowerCase();
+    if (lower.startsWith('mg')) return 'mg';
+    if (lower.startsWith('g')) return 'g';
+    if (lower.startsWith('µg') || lower.startsWith('μg') || lower.startsWith('mcg')) return 'ug';
+    // Fallback: assume microgram if unknown
+    return 'ug';
+  }
+
+  // Convert an amount from one unit to another.
+  // Supported:
+  // - mg <-> ug <-> g
+  // - IU->ug for Vitamin D only (1 µg = 40 IU)
+  // Returns null if conversion cannot be performed.
+  double? _convertAmountToTargetUnit({
+    required String ingredientName,
+    required double amount,
+    required String fromUnit,
+    required String toUnit,
+  }) {
+    if (amount.isNaN || amount.isInfinite) return null;
+
+    // Handle IU conversions only for Vitamin D
+    final name = _normalizeIngredientName(ingredientName);
+    final isVitaminD = name.contains('vitamin d') || name.contains('cholecalciferol') || name.contains('ergocalciferol');
+
+    // If fromUnit equals toUnit and it's one of our supported numeric units
+    if ((fromUnit == toUnit) && (fromUnit == 'mg' || fromUnit == 'ug' || fromUnit == 'g')) {
+      return amount;
+    }
+
+    // IU -> ug for Vitamin D
+    if (fromUnit == 'iu' && isVitaminD) {
+      // 1 µg = 40 IU => ug = IU / 40
+      final ug = amount / 40.0;
+      if (toUnit == 'ug') return ug;
+      if (toUnit == 'mg') return ug / 1000.0;
+      if (toUnit == 'g') return ug / 1e6;
+      return null;
+    }
+
+    // Mass conversions
+    double? inUg;
+    if (fromUnit == 'ug') {
+      inUg = amount;
+    } else if (fromUnit == 'mg') {
+      inUg = amount * 1000.0;
+    } else if (fromUnit == 'g') {
+      inUg = amount * 1e6;
+    } else {
+      // Unsupported unit (e.g., ml, drops)
+      return null;
+    }
+
+    if (toUnit == 'ug') return inUg;
+    if (toUnit == 'mg') return inUg / 1000.0;
+    if (toUnit == 'g') return inUg / 1e6;
+
+    return null;
+  }
+
+  // Normalize an ingredient name for alias matching
+  String _normalizeIngredientName(String name) {
+    final lower = name.trim().toLowerCase();
+    // Replace common punctuation with spaces, then condense
+    final replaced = lower
+        .replaceAll(RegExp(r'[\(\)\[\]\{\},;:+/_-]+'), ' ')
+        .replaceAll(RegExp(r'\s+'), ' ')
+        .trim();
+    return replaced;
+  }
+
+  // -----------------------
+  // Life stage matching
+  // -----------------------
+
+  LifeStage? _matchLifeStageForProfile(List<LifeStage> stages, _UserProfile profile) {
+    // Exclude pregnancy/lactation when we don't track that state yet
+    final filtered = stages.where((s) {
+      final l = s.ageRange.toLowerCase();
+      return !(l.contains('pregnancy') || l.contains('lactation'));
+    }).toList();
+
+    // Try in order:
+    // 1) Exact age match + exact sex
+    final exactSexMatch = filtered.where((s) => _matchesAge(s.ageRange, profile) && _matchesSex(s.sex, profile)).toList();
+    if (exactSexMatch.isNotEmpty) return exactSexMatch.first;
+
+    // 2) Age match + sex == 'both'
+    final bothMatch = filtered.where((s) => _matchesAge(s.ageRange, profile) && s.sex.toLowerCase() == 'both').toList();
+    if (bothMatch.isNotEmpty) return bothMatch.first;
+
+    // 3) Age match ignoring sex (fallback)
+    final ageOnly = filtered.where((s) => _matchesAge(s.ageRange, profile)).toList();
+    if (ageOnly.isNotEmpty) return ageOnly.first;
+
+    // 4) If nothing matches, try 'adult-like' fallback: pick a reasonable adult range
+    final adultFallback = filtered.where((s) => s.ageRange.contains('19-30') || s.ageRange.contains('31-50')).toList();
+    if (adultFallback.isNotEmpty) return adultFallback.first;
+
+    // 5) Any entry as last resort
+    return filtered.isNotEmpty ? filtered.first : null;
+  }
+
+  bool _matchesSex(String stageSex, _UserProfile profile) {
+    final s = stageSex.toLowerCase();
+    if (s == 'both') return true;
+    if (profile.isInfant && s == 'infant') return true;
+    if (profile.sex == _Sex.male && s == 'male') return true;
+    if (profile.sex == _Sex.female && s == 'female') return true;
+
+    // For 'Other' or 'Prefer not to say', accept 'both'
+    if (profile.sex == _Sex.unknown && s == 'both') return true;
+
+    return false;
+  }
+
+  bool _matchesAge(String ageRange, _UserProfile profile) {
+    final ar = ageRange.toLowerCase().trim();
+
+    // Common shorthand: "adult" (assume >= 18 years)
+    if (ar == 'adult' || ar == 'adults') {
+      return profile.ageYears >= 18;
+    }
+
+    // Months range: e.g., "0-6 mo" or "7-12 mo"
+    final moMatch = RegExp(r'^(\d+)\s*-\s*(\d+)\s*mo$').firstMatch(ar);
+    if (moMatch != null) {
+      if (!profile.isInfant) return false;
+      final minMo = int.parse(moMatch.group(1)!);
+      final maxMo = int.parse(moMatch.group(2)!);
+      return profile.ageMonths >= minMo && profile.ageMonths <= maxMo;
+    }
+
+    // Years range: e.g., "1-3 y", "4-8 y", "9-13 y", "14-18 y", "19-30 y", "31-50 y", "51-70 y"
+    final yearRange = RegExp(r'^(\d+)\s*-\s*(\d+)\s*y$').firstMatch(ar);
+    if (yearRange != null) {
+      final minY = int.parse(yearRange.group(1)!);
+      final maxY = int.parse(yearRange.group(2)!);
+      return profile.ageYears >= minY && profile.ageYears <= maxY;
+    }
+
+    // Greater than: e.g., ">70 y"
+    final gtYear = RegExp(r'^>\s*(\d+)\s*y$').firstMatch(ar);
+    if (gtYear != null) {
+      final minExclusive = int.parse(gtYear.group(1)!);
+      return profile.ageYears > minExclusive;
+    }
+
+    // "infant" buckets handled via months range above
+    // Any unknown format: do a best-effort fallback
+    if (profile.isInfant) {
+      // If the stage mentions "infant", accept
+      if (ar.contains('infant')) return true;
+      // Else, if it starts at 0-? y, let's accept if upper bound >= 0 (rare)
+      if (ar.contains('0-') && ar.contains('y')) return true;
+      return false;
+    }
+
+    // If we are adult and stage is one of the adult ranges not following the patterns,
+    // just return false to avoid false positives.
+    return false;
+  }
+}
+
+/// Internal representation of user profile for matching
+class _UserProfile {
+  final int ageYears; // rounded down, e.g., 29
+  final int ageMonths; // total months (for infants). If >= 12, consider non-infant.
+  final _Sex sex;
+  bool get isInfant => ageYears < 1;
+
+  _UserProfile({
+    required this.ageYears,
+    required this.ageMonths,
+    required this.sex,
+  });
+
+  factory _UserProfile.from({DateTime? dateOfBirth, String? gender}) {
+    final now = DateTime.now();
+
+    int years;
+    int monthsTotal;
+    if (dateOfBirth == null) {
+      // Default to adult 30 years old when unknown
+      years = 30;
+      monthsTotal = 30 * 12;
+    } else {
+      years = now.year - dateOfBirth.year;
+      final beforeBirthday = (now.month < dateOfBirth.month) ||
+          (now.month == dateOfBirth.month && now.day < dateOfBirth.day);
+      if (beforeBirthday) years = max(0, years - 1);
+
+      // Calculate total months difference
+      int months = (now.year - dateOfBirth.year) * 12 + (now.month - dateOfBirth.month);
+      if (now.day < dateOfBirth.day) {
+        months = max(0, months - 1);
+      }
+      monthsTotal = max(0, months);
+    }
+
+    final s = _parseSex(gender);
+
+    return _UserProfile(
+      ageYears: years,
+      ageMonths: monthsTotal,
+      sex: s,
+    );
+  }
+}
+
+enum _Sex { male, female, unknown }
+
+_Sex _parseSex(String? gender) {
+  if (gender == null) return _Sex.unknown;
+  final g = gender.trim().toLowerCase();
+  if (g == 'male') return _Sex.male;
+  if (g == 'female') return _Sex.female;
+  return _Sex.unknown; // 'Other', 'Prefer not to say' -> unknown
+}

lib/services/webdav_sync_service.dart

@@ -1,928 +0,0 @@
-import 'dart:convert';
-import 'dart:io';
-
-import 'package:connectivity_plus/connectivity_plus.dart';
-import 'package:flutter/foundation.dart';
-import 'package:flutter_secure_storage/flutter_secure_storage.dart';
-import 'package:webdav_client/webdav_client.dart';
-
-import '../models/supplement.dart';
-import '../models/supplement_intake.dart';
-import '../models/sync_data.dart';
-import '../models/sync_enums.dart';
-import 'database_helper.dart';
-
-/// Service for handling WebDAV synchronization operations
-class WebDAVSyncService {
-  static const String _baseUrlKey = 'webdav_base_url';
-  static const String _usernameKey = 'webdav_username';
-  static const String _passwordKey = 'webdav_password';
-  static const String _deviceNameKey = 'webdav_device_name';
-  static const String _deviceIdKey = 'webdav_device_id';
-  static const String _lastSyncTimeKey = 'webdav_last_sync_time';
-  static const String _lastWorkingUrlKey = 'webdav_last_working_url';
-  static const String _syncFolderNameKey = 'webdav_sync_folder_name';
-
-  final FlutterSecureStorage _secureStorage = const FlutterSecureStorage(
-    aOptions: AndroidOptions(
-      encryptedSharedPreferences: true,
-    ),
-    iOptions: IOSOptions(
-      accessibility: KeychainAccessibility.first_unlock_this_device,
-    ),
-  );
-
-  final DatabaseHelper _databaseHelper = DatabaseHelper.instance;
-  final Connectivity _connectivity = Connectivity();
-
-  Client? _webdavClient;
-  String? _currentDeviceId;
-  String? _currentDeviceName;
-  String? _syncFolderName;
-
-  /// Initialize the service and generate device ID if needed
-  Future<void> initialize() async {
-    await _ensureDeviceInfo();
-    _syncFolderName = await getSyncFolderName();
-  }
-
-  /// Check if WebDAV is configured
-  Future<bool> isConfigured() async {
-    final baseUrl = await _secureStorage.read(key: _baseUrlKey);
-    final username = await _secureStorage.read(key: _usernameKey);
-    final password = await _secureStorage.read(key: _passwordKey);
-
-    return baseUrl != null &&
-           baseUrl.isNotEmpty &&
-           username != null &&
-           username.isNotEmpty &&
-           password != null &&
-           password.isNotEmpty;
-  }
-
-  /// Configure WebDAV connection
-  Future<bool> configure({
-    required String baseUrl,
-    required String username,
-    String? password,
-    String? deviceName,
-    String? syncFolderName,
-  }) async {
-    try {
-      // For updates without password, get existing password
-      String actualPassword = password ?? '';
-      if (password == null) {
-        actualPassword = await _secureStorage.read(key: _passwordKey) ?? '';
-        if (actualPassword.isEmpty) {
-          throw Exception('No existing password found and no new password provided');
-        }
-      }
-
-      // Validate and normalize base URL
-      final normalizedUrl = _normalizeUrl(baseUrl);
-
-      // Build the full WebDAV URL with username for Nextcloud/ownCloud
-      final fullWebdavUrl = _buildFullWebDAVUrl(normalizedUrl, username);
-
-      // Test connection with smart fallback
-      final testResult = await _testConnectionWithFallback(
-        fullWebdavUrl,
-        username,
-        actualPassword,
-        baseUrl, // Original URL for fallback attempts
-      );
-
-      if (!testResult.success) {
-        throw Exception(testResult.errorMessage);
-      }
-
-      final finalUrl = testResult.workingUrl!;
-
-      // Save configuration with the working URL
-      await _secureStorage.write(key: _baseUrlKey, value: finalUrl);
-      await _secureStorage.write(key: _lastWorkingUrlKey, value: finalUrl);
-      await _secureStorage.write(key: _usernameKey, value: username);
-      await _secureStorage.write(key: _passwordKey, value: actualPassword);
-
-      if (deviceName != null && deviceName.isNotEmpty) {
-        await _secureStorage.write(key: _deviceNameKey, value: deviceName);
-        _currentDeviceName = deviceName;
-      }
-
-      // Store sync folder name
-      final folderName = syncFolderName ?? 'Supplements';
-      await _secureStorage.write(key: _syncFolderNameKey, value: folderName);
-      _syncFolderName = folderName;
-
-      // Initialize client with the working URL
-      _webdavClient = newClient(
-        finalUrl,
-        user: username,
-        password: actualPassword,
-        debug: kDebugMode,
-      );
-
-      // Ensure sync directory exists
-      await _ensureSyncDirectoryExists();
-
-      if (kDebugMode) {
-        print('WebDAV configured successfully: $finalUrl');
-        print('Original URL: $baseUrl -> Detected: $finalUrl');
-      }
-
-      return true;
-    } catch (e) {
-      if (kDebugMode) {
-        print('WebDAV configuration failed: $e');
-      }
-      return false;
-    }
-  }
-
-  /// Remove WebDAV configuration
-  Future<void> clearConfiguration() async {
-    await _secureStorage.delete(key: _baseUrlKey);
-    await _secureStorage.delete(key: _usernameKey);
-    await _secureStorage.delete(key: _passwordKey);
-    await _secureStorage.delete(key: _deviceNameKey);
-    await _secureStorage.delete(key: _lastSyncTimeKey);
-    await _secureStorage.delete(key: _lastWorkingUrlKey);
-    await _secureStorage.delete(key: _syncFolderNameKey);
-    _webdavClient = null;
-    _syncFolderName = null;
-  }
-
-  /// Test WebDAV connection
-  Future<bool> testConnection() async {
-    try {
-      await _ensureClient();
-      if (_webdavClient == null) return false;
-
-      await _webdavClient!.ping();
-      return true;
-    } catch (e) {
-      if (kDebugMode) {
-        print('WebDAV connection test failed: $e');
-      }
-      return false;
-    }
-  }
-
-  /// Check if device has internet connectivity
-  Future<bool> hasConnectivity() async {
-    final connectivityResult = await _connectivity.checkConnectivity();
-    return connectivityResult.any((result) =>
-      result == ConnectivityResult.mobile ||
-      result == ConnectivityResult.wifi ||
-      result == ConnectivityResult.ethernet);
-  }
-
-  /// Perform full sync operation
-  Future<SyncResult> performSync() async {
-    final syncStartTime = DateTime.now();
-
-    try {
-      // Check connectivity
-      if (!await hasConnectivity()) {
-        return SyncResult.failure(
-          error: 'No internet connection',
-          status: SyncOperationStatus.networkError,
-        );
-      }
-
-      // Ensure client is initialized
-      await _ensureClient();
-      if (_webdavClient == null) {
-        return SyncResult.failure(
-          error: 'WebDAV client not configured',
-          status: SyncOperationStatus.authenticationError,
-        );
-      }
-
-      // Download remote data
-      final remoteSyncData = await _downloadSyncData();
-
-      // Get local data that needs syncing
-      final localSyncData = await _getLocalSyncData();
-
-      // Merge data and detect conflicts
-      final mergeResult = await _mergeData(localSyncData, remoteSyncData);
-
-      // Upload merged data back to server
-      if (mergeResult.hasChanges) {
-        await _uploadSyncData(mergeResult.mergedData);
-      }
-
-      // Update local sync status
-      await _updateLocalSyncStatus(mergeResult.mergedData);
-
-      // Update last sync time
-      await _updateLastSyncTime();
-
-      final syncDuration = DateTime.now().difference(syncStartTime);
-
-      return SyncResult.success(
-        conflicts: mergeResult.conflicts,
-        statistics: SyncStatistics(
-          supplementsUploaded: mergeResult.statistics.supplementsUploaded,
-          supplementsDownloaded: mergeResult.statistics.supplementsDownloaded,
-          intakesUploaded: mergeResult.statistics.intakesUploaded,
-          intakesDownloaded: mergeResult.statistics.intakesDownloaded,
-          conflictsResolved: mergeResult.statistics.conflictsResolved,
-          syncDuration: syncDuration,
-        ),
-      );
-
-    } catch (e) {
-      if (kDebugMode) {
-        print('Sync operation failed: $e');
-      }
-
-      SyncOperationStatus status = SyncOperationStatus.serverError;
-      if (e is SocketException || e.toString().contains('network')) {
-        status = SyncOperationStatus.networkError;
-      } else if (e.toString().contains('401') || e.toString().contains('403')) {
-        status = SyncOperationStatus.authenticationError;
-      }
-
-      return SyncResult.failure(
-        error: e.toString(),
-        status: status,
-      );
-    }
-  }
-
-  /// Get last sync time
-  Future<DateTime?> getLastSyncTime() async {
-    final lastSyncStr = await _secureStorage.read(key: _lastSyncTimeKey);
-    if (lastSyncStr != null) {
-      return DateTime.tryParse(lastSyncStr);
-    }
-    return null;
-  }
-
-  /// Get current device info
-  Future<Map<String, String?>> getDeviceInfo() async {
-    await _ensureDeviceInfo();
-    return {
-      'deviceId': _currentDeviceId,
-      'deviceName': _currentDeviceName,
-    };
-  }
-
-  /// Get the last working WebDAV URL
-  Future<String?> getLastWorkingUrl() async {
-    return await _secureStorage.read(key: _lastWorkingUrlKey);
-  }
-
-  /// Get stored server URL
-  Future<String?> getServerUrl() async {
-    return await _secureStorage.read(key: _baseUrlKey);
-  }
-
-  /// Get stored username
-  Future<String?> getUsername() async {
-    return await _secureStorage.read(key: _usernameKey);
-  }
-
-  /// Get stored sync folder name
-  Future<String?> getSyncFolderName() async {
-    final folderName = await _secureStorage.read(key: _syncFolderNameKey);
-    return folderName ?? 'Supplements';
-  }
-
-  // Private methods
-
-  Future<void> _ensureDeviceInfo() async {
-    _currentDeviceId = await _secureStorage.read(key: _deviceIdKey);
-    if (_currentDeviceId == null) {
-      _currentDeviceId = _generateDeviceId();
-      await _secureStorage.write(key: _deviceIdKey, value: _currentDeviceId!);
-    }
-
-    _currentDeviceName = await _secureStorage.read(key: _deviceNameKey);
-    if (_currentDeviceName == null) {
-      _currentDeviceName = _getDefaultDeviceName();
-      await _secureStorage.write(key: _deviceNameKey, value: _currentDeviceName!);
-    }
-  }
-
-  String _generateDeviceId() {
-    final timestamp = DateTime.now().millisecondsSinceEpoch;
-    final random = DateTime.now().microsecond;
-    return 'device_${timestamp}_$random';
-  }
-
-  String _getDefaultDeviceName() {
-    if (Platform.isAndroid) return 'Android Device';
-    if (Platform.isIOS) return 'iOS Device';
-    if (Platform.isWindows) return 'Windows PC';
-    if (Platform.isMacOS) return 'Mac';
-    if (Platform.isLinux) return 'Linux PC';
-    return 'Unknown Device';
-  }
-
-  String _normalizeUrl(String url) {
-    // Clean and trim the URL
-    url = url.trim();
-    if (url.endsWith('/')) {
-      url = url.substring(0, url.length - 1);
-    }
-
-    // Add protocol if missing - try HTTPS first, fallback to HTTP if needed
-    if (!url.startsWith('http://') && !url.startsWith('https://')) {
-      url = 'https://$url';
-    }
-
-    return _detectAndBuildWebDAVUrl(url);
-  }
-
-  /// Advanced server detection and WebDAV URL building
-  String _detectAndBuildWebDAVUrl(String baseUrl) {
-    final uri = Uri.tryParse(baseUrl);
-    if (uri == null) return baseUrl;
-
-    final host = uri.host.toLowerCase();
-    final path = uri.path.toLowerCase();
-
-    // If already contains WebDAV path, return as-is
-    if (path.contains('/remote.php/dav') || path.contains('/remote.php/webdav')) {
-      return baseUrl;
-    }
-
-    // Nextcloud detection patterns
-    if (_isNextcloudServer(host, path)) {
-      return _buildNextcloudUrl(baseUrl, uri);
-    }
-
-    // ownCloud detection patterns
-    if (_isOwnCloudServer(host, path)) {
-      return _buildOwnCloudUrl(baseUrl, uri);
-    }
-
-    // Generic WebDAV detection
-    if (_isGenericWebDAVServer(host, path)) {
-      return _buildGenericWebDAVUrl(baseUrl, uri);
-    }
-
-    // Default: assume it's a base URL and try Nextcloud first (most common)
-    return _buildNextcloudUrl(baseUrl, uri);
-  }
-
-  /// Detect if server is likely Nextcloud
-  bool _isNextcloudServer(String host, String path) {
-    // Common Nextcloud hosting patterns
-    final nextcloudPatterns = [
-      'nextcloud',
-      'cloud',
-      'nc.',
-      '.cloud.',
-      'files.',
-      'drive.',
-    ];
-
-    // Check hostname patterns
-    for (final pattern in nextcloudPatterns) {
-      if (host.contains(pattern)) return true;
-    }
-
-    // Check path patterns
-    if (path.contains('nextcloud') || path.contains('index.php/apps/files')) {
-      return true;
-    }
-
-    return false;
-  }
-
-  /// Detect if server is likely ownCloud
-  bool _isOwnCloudServer(String host, String path) {
-    final owncloudPatterns = [
-      'owncloud',
-      'oc.',
-      '.owncloud.',
-    ];
-
-    // Check hostname patterns
-    for (final pattern in owncloudPatterns) {
-      if (host.contains(pattern)) return true;
-    }
-
-    // Check path patterns
-    if (path.contains('owncloud') || path.contains('index.php/apps/files')) {
-      return true;
-    }
-
-    return false;
-  }
-
-  /// Detect if server might be generic WebDAV
-  bool _isGenericWebDAVServer(String host, String path) {
-    final webdavPatterns = [
-      'webdav',
-      'dav',
-      'caldav',
-      'carddav',
-    ];
-
-    // Check hostname and path for WebDAV indicators
-    for (final pattern in webdavPatterns) {
-      if (host.contains(pattern) || path.contains(pattern)) return true;
-    }
-
-    return false;
-  }
-
-  /// Build Nextcloud WebDAV URL with username detection
-  String _buildNextcloudUrl(String baseUrl, Uri uri) {
-    String webdavUrl = '${uri.scheme}://${uri.host}';
-
-    if (uri.hasPort && uri.port != 80 && uri.port != 443) {
-      webdavUrl += ':${uri.port}';
-    }
-
-    // Handle subdirectory installations
-    String basePath = uri.path;
-    if (basePath.isNotEmpty && basePath != '/') {
-      // Remove common Nextcloud paths that shouldn't be in base
-      basePath = basePath.replaceAll(RegExp(r'/index\.php.*$'), '');
-      basePath = basePath.replaceAll(RegExp(r'/apps/files.*$'), '');
-      webdavUrl += basePath;
-    }
-
-    // Add Nextcloud WebDAV path - we'll need username later
-    webdavUrl += '/remote.php/dav/files/';
-
-    return webdavUrl;
-  }
-
-  /// Build ownCloud WebDAV URL
-  String _buildOwnCloudUrl(String baseUrl, Uri uri) {
-    String webdavUrl = '${uri.scheme}://${uri.host}';
-
-    if (uri.hasPort && uri.port != 80 && uri.port != 443) {
-      webdavUrl += ':${uri.port}';
-    }
-
-    // Handle subdirectory installations
-    String basePath = uri.path;
-    if (basePath.isNotEmpty && basePath != '/') {
-      basePath = basePath.replaceAll(RegExp(r'/index\.php.*$'), '');
-      basePath = basePath.replaceAll(RegExp(r'/apps/files.*$'), '');
-      webdavUrl += basePath;
-    }
-
-    webdavUrl += '/remote.php/webdav/';
-
-    return webdavUrl;
-  }
-
-  /// Build generic WebDAV URL
-  String _buildGenericWebDAVUrl(String baseUrl, Uri uri) {
-    // For generic WebDAV, we assume the URL provided is correct
-    // but we might need to add common WebDAV paths if missing
-    if (!uri.path.endsWith('/')) {
-      return '$baseUrl/';
-    }
-    return baseUrl;
-  }
-
-  Future<void> _ensureClient() async {
-    if (_webdavClient == null) {
-      final baseUrl = await _secureStorage.read(key: _baseUrlKey);
-      final username = await _secureStorage.read(key: _usernameKey);
-      final password = await _secureStorage.read(key: _passwordKey);
-
-      if (baseUrl != null && username != null && password != null) {
-        _webdavClient = newClient(
-          baseUrl,
-          user: username,
-          password: password,
-          debug: kDebugMode,
-        );
-      }
-    }
-  }
-
-  Future<void> _ensureSyncDirectoryExists() async {
-    if (_webdavClient == null) return;
-
-    // Get the configured folder name, default to 'Supplements'
-    final folderName = _syncFolderName ?? await getSyncFolderName() ?? 'Supplements';
-
-    try {
-      await _webdavClient!.mkdir(folderName);
-    } catch (e) {
-      // Directory might already exist, ignore error
-      if (kDebugMode && !e.toString().contains('409')) {
-        print('Failed to create sync directory ($folderName): $e');
-      }
-    }
-  }
-
-  Future<SyncData?> _downloadSyncData() async {
-    if (_webdavClient == null) return null;
-
-    try {
-      final folderName = _syncFolderName ?? await getSyncFolderName() ?? 'Supplements';
-      final syncFilePath = '$folderName/${SyncConstants.syncFileName}';
-      final fileData = await _webdavClient!.read(syncFilePath);
-      final jsonString = utf8.decode(fileData);
-      return SyncData.fromJsonString(jsonString);
-    } catch (e) {
-      if (kDebugMode) {
-        print('Failed to download sync data: $e');
-      }
-      return null;
-    }
-  }
-
-  Future<SyncData> _getLocalSyncData() async {
-    await _ensureDeviceInfo();
-
-    final supplements = await _databaseHelper.getAllSupplements();
-    final archivedSupplements = await _databaseHelper.getArchivedSupplements();
-    final allSupplements = [...supplements, ...archivedSupplements];
-
-    // Get all intakes (we'll need to implement a method to get all intakes)
-    final intakes = await _getAllIntakes();
-
-    return SyncData(
-      version: SyncConstants.currentSyncVersion,
-      deviceId: _currentDeviceId!,
-      deviceName: _currentDeviceName!,
-      syncTimestamp: DateTime.now(),
-      supplements: allSupplements,
-      intakes: intakes,
-      metadata: {
-        'totalSupplements': allSupplements.length,
-        'totalIntakes': intakes.length,
-      },
-    );
-  }
-
-  Future<List<SupplementIntake>> _getAllIntakes() async {
-    // This is a simplified version - in practice, you might want to limit
-    // to a certain date range or implement pagination for large datasets
-    final now = DateTime.now();
-    final oneYearAgo = now.subtract(const Duration(days: 365));
-
-    List<SupplementIntake> allIntakes = [];
-    DateTime current = oneYearAgo;
-
-    while (current.isBefore(now)) {
-      final monthIntakes = await _databaseHelper.getIntakesForMonth(
-        current.year,
-        current.month,
-      );
-      allIntakes.addAll(monthIntakes);
-      current = DateTime(current.year, current.month + 1);
-    }
-
-    return allIntakes;
-  }
-
-  Future<_MergeResult> _mergeData(SyncData local, SyncData? remote) async {
-    if (remote == null) {
-      // No remote data, just mark local data as pending sync
-      return _MergeResult(
-        mergedData: local,
-        conflicts: [],
-        hasChanges: true,
-        statistics: SyncStatistics(
-          supplementsUploaded: local.supplements.length,
-          intakesUploaded: local.intakes.length,
-        ),
-      );
-    }
-
-    final conflicts = <SyncConflict>[];
-    final mergedSupplements = <String, Supplement>{};
-    final mergedIntakes = <String, SupplementIntake>{};
-
-    // Merge supplements
-    for (final localSupplement in local.supplements) {
-      mergedSupplements[localSupplement.syncId] = localSupplement;
-    }
-
-    int supplementsDownloaded = 0;
-    int supplementsUploaded = local.supplements.length;
-
-    for (final remoteSupplement in remote.supplements) {
-      final localSupplement = mergedSupplements[remoteSupplement.syncId];
-
-      if (localSupplement == null) {
-        // New remote supplement
-        mergedSupplements[remoteSupplement.syncId] = remoteSupplement;
-        supplementsDownloaded++;
-      } else {
-        // Check for conflicts
-        if (localSupplement.lastModified.isAfter(remoteSupplement.lastModified)) {
-          // Local is newer, keep local
-          continue;
-        } else if (remoteSupplement.lastModified.isAfter(localSupplement.lastModified)) {
-          // Remote is newer, use remote
-          mergedSupplements[remoteSupplement.syncId] = remoteSupplement;
-          supplementsDownloaded++;
-        } else {
-          // Same timestamp - potential conflict if data differs
-          if (!_supplementsEqual(localSupplement, remoteSupplement)) {
-            conflicts.add(SyncConflict(
-              syncId: localSupplement.syncId,
-              type: ConflictType.modification,
-              localTimestamp: localSupplement.lastModified,
-              remoteTimestamp: remoteSupplement.lastModified,
-              localData: localSupplement.toMap(),
-              remoteData: remoteSupplement.toMap(),
-              suggestedResolution: ConflictResolutionStrategy.preferNewer,
-            ));
-
-            // For now, keep local version
-            continue;
-          }
-        }
-      }
-    }
-
-    // Merge intakes (intakes are usually append-only, so fewer conflicts)
-    for (final localIntake in local.intakes) {
-      mergedIntakes[localIntake.syncId] = localIntake;
-    }
-
-    int intakesDownloaded = 0;
-    int intakesUploaded = local.intakes.length;
-
-    for (final remoteIntake in remote.intakes) {
-      if (!mergedIntakes.containsKey(remoteIntake.syncId)) {
-        mergedIntakes[remoteIntake.syncId] = remoteIntake;
-        intakesDownloaded++;
-      }
-    }
-
-    final mergedData = SyncData(
-      version: SyncConstants.currentSyncVersion,
-      deviceId: local.deviceId,
-      deviceName: local.deviceName,
-      syncTimestamp: DateTime.now(),
-      supplements: mergedSupplements.values.toList(),
-      intakes: mergedIntakes.values.toList(),
-      metadata: {
-        'mergedAt': DateTime.now().toIso8601String(),
-        'sourceDevices': [local.deviceId, remote.deviceId],
-        'conflicts': conflicts.length,
-      },
-    );
-
-    return _MergeResult(
-      mergedData: mergedData,
-      conflicts: conflicts,
-      hasChanges: supplementsDownloaded > 0 || intakesDownloaded > 0 || conflicts.isNotEmpty,
-      statistics: SyncStatistics(
-        supplementsUploaded: supplementsUploaded,
-        supplementsDownloaded: supplementsDownloaded,
-        intakesUploaded: intakesUploaded,
-        intakesDownloaded: intakesDownloaded,
-        conflictsResolved: 0, // Conflicts are not auto-resolved yet
-      ),
-    );
-  }
-
-  bool _supplementsEqual(Supplement a, Supplement b) {
-    return a.name == b.name &&
-           a.brand == b.brand &&
-           a.numberOfUnits == b.numberOfUnits &&
-           a.unitType == b.unitType &&
-           a.frequencyPerDay == b.frequencyPerDay &&
-           a.reminderTimes.join(',') == b.reminderTimes.join(',') &&
-           a.notes == b.notes &&
-           a.isActive == b.isActive &&
-           a.isDeleted == b.isDeleted &&
-           _ingredientsEqual(a.ingredients, b.ingredients);
-  }
-
-  bool _ingredientsEqual(List ingredients1, List ingredients2) {
-    if (ingredients1.length != ingredients2.length) return false;
-
-    for (int i = 0; i < ingredients1.length; i++) {
-      final ing1 = ingredients1[i];
-      final ing2 = ingredients2[i];
-      if (ing1.name != ing2.name ||
-          ing1.amount != ing2.amount ||
-          ing1.unit != ing2.unit) {
-        return false;
-      }
-    }
-    return true;
-  }
-
-  Future<void> _uploadSyncData(SyncData syncData) async {
-    if (_webdavClient == null) return;
-
-    final folderName = _syncFolderName ?? await getSyncFolderName() ?? 'Supplements';
-    final syncFilePath = '$folderName/${SyncConstants.syncFileName}';
-    final jsonString = syncData.toJsonString();
-    final jsonBytes = utf8.encode(jsonString);
-
-    // Create backup of existing file first
-    try {
-      final backupPath = '$folderName/${SyncConstants.syncFileBackupName}';
-      final existingData = await _webdavClient!.read(syncFilePath);
-      await _webdavClient!.write(backupPath, Uint8List.fromList(existingData));
-    } catch (e) {
-      // Backup failed, continue anyway
-      if (kDebugMode) {
-        print('Failed to create backup: $e');
-      }
-    }
-
-    // Upload new sync data
-    await _webdavClient!.write(syncFilePath, jsonBytes);
-
-    if (kDebugMode) {
-      print('Sync data uploaded successfully to $folderName');
-    }
-  }
-
-  Future<void> _updateLocalSyncStatus(SyncData mergedData) async {
-    // Mark all synced items as synced in local database
-    for (final supplement in mergedData.supplements) {
-      if (supplement.syncStatus != SyncStatus.synced) {
-        await _databaseHelper.markSupplementAsSynced(supplement.syncId);
-      }
-    }
-
-    for (final intake in mergedData.intakes) {
-      if (intake.syncStatus != SyncStatus.synced) {
-        await _databaseHelper.markIntakeAsSynced(intake.syncId);
-      }
-    }
-  }
-
-  Future<void> _updateLastSyncTime() async {
-    await _secureStorage.write(
-      key: _lastSyncTimeKey,
-      value: DateTime.now().toIso8601String(),
-    );
-  }
-
-  /// Build full WebDAV URL including username for Nextcloud/ownCloud
-  String _buildFullWebDAVUrl(String baseUrl, String username) {
-    // If URL ends with /files/ (Nextcloud), add username
-    if (baseUrl.endsWith('/remote.php/dav/files/')) {
-      return '$baseUrl$username/';
-    }
-
-    // If URL ends with /webdav/ (ownCloud), it's ready to use
-    if (baseUrl.endsWith('/remote.php/webdav/')) {
-      return baseUrl;
-    }
-
-    // For other cases, return as-is
-    return baseUrl;
-  }
-
-  /// Test connection with smart fallback logic
-  Future<_ConnectionTestResult> _testConnectionWithFallback(
-    String primaryUrl,
-    String username,
-    String password,
-    String originalUrl,
-  ) async {
-    // Try the primary detected URL first
-    try {
-      final client = newClient(primaryUrl, user: username, password: password, debug: kDebugMode);
-      await client.ping();
-      return _ConnectionTestResult.success(primaryUrl);
-    } catch (e) {
-      if (kDebugMode) {
-        print('Primary URL failed: $primaryUrl - $e');
-      }
-    }
-
-    // Generate fallback URLs to try
-    final fallbackUrls = _generateFallbackUrls(originalUrl, username);
-
-    for (final fallbackUrl in fallbackUrls) {
-      try {
-        final client = newClient(fallbackUrl, user: username, password: password, debug: kDebugMode);
-        await client.ping();
-
-        if (kDebugMode) {
-          print('Fallback URL succeeded: $fallbackUrl');
-        }
-
-        return _ConnectionTestResult.success(fallbackUrl);
-      } catch (e) {
-        if (kDebugMode) {
-          print('Fallback URL failed: $fallbackUrl - $e');
-        }
-        continue;
-      }
-    }
-
-    return _ConnectionTestResult.failure('Could not connect to WebDAV server. Please check your server URL, username, and password.');
-  }
-
-  /// Generate fallback URLs to try if primary detection fails
-  List<String> _generateFallbackUrls(String originalUrl, String username) {
-    final fallbackUrls = <String>[];
-
-    final uri = Uri.tryParse(originalUrl.startsWith('http') ? originalUrl : 'https://$originalUrl');
-    if (uri == null) return fallbackUrls;
-
-    String baseUrl = '${uri.scheme}://${uri.host}';
-    if (uri.hasPort && uri.port != 80 && uri.port != 443) {
-      baseUrl += ':${uri.port}';
-    }
-
-    // Add path if exists (for subdirectory installations)
-    String installPath = uri.path;
-    if (installPath.isNotEmpty && installPath != '/') {
-      // Clean common paths
-      installPath = installPath.replaceAll(RegExp(r'/index\.php.*$'), '');
-      installPath = installPath.replaceAll(RegExp(r'/apps/files.*$'), '');
-      installPath = installPath.replaceAll(RegExp(r'/remote\.php.*$'), '');
-      baseUrl += installPath;
-    }
-
-    // Try different combinations
-    fallbackUrls.addAll([
-      // Nextcloud variants
-      '$baseUrl/remote.php/dav/files/$username/',
-      '$baseUrl/nextcloud/remote.php/dav/files/$username/',
-      '$baseUrl/cloud/remote.php/dav/files/$username/',
-
-      // ownCloud variants
-      '$baseUrl/remote.php/webdav/',
-      '$baseUrl/owncloud/remote.php/webdav/',
-
-      // Generic WebDAV variants
-      '$baseUrl/webdav/',
-      '$baseUrl/dav/',
-
-      // Try with different protocols if HTTPS failed
-      ..._generateProtocolVariants(baseUrl, username),
-    ]);
-
-    // Remove duplicates and return
-    return fallbackUrls.toSet().toList();
-  }
-
-  /// Generate protocol variants (HTTP/HTTPS)
-  List<String> _generateProtocolVariants(String baseUrl, String username) {
-    if (baseUrl.startsWith('https://')) {
-      // Try HTTP variants
-      final httpBase = baseUrl.replaceFirst('https://', 'http://');
-      return [
-        '$httpBase/remote.php/dav/files/$username/',
-        '$httpBase/remote.php/webdav/',
-        '$httpBase/webdav/',
-      ];
-    } else if (baseUrl.startsWith('http://')) {
-      // Try HTTPS variants
-      final httpsBase = baseUrl.replaceFirst('http://', 'https://');
-      return [
-        '$httpsBase/remote.php/dav/files/$username/',
-        '$httpsBase/remote.php/webdav/',
-        '$httpsBase/webdav/',
-      ];
-    }
-
-    return [];
-  }
-}
-
-/// Internal class for merge operation results
-class _MergeResult {
-  final SyncData mergedData;
-  final List<SyncConflict> conflicts;
-  final bool hasChanges;
-  final SyncStatistics statistics;
-
-  const _MergeResult({
-    required this.mergedData,
-    required this.conflicts,
-    required this.hasChanges,
-    required this.statistics,
-  });
-}
-
-/// Internal class for connection test results
-class _ConnectionTestResult {
-  final bool success;
-  final String? workingUrl;
-  final String? errorMessage;
-
-  const _ConnectionTestResult._({
-    required this.success,
-    this.workingUrl,
-    this.errorMessage,
-  });
-
-  factory _ConnectionTestResult.success(String url) {
-    return _ConnectionTestResult._(success: true, workingUrl: url);
-  }
-
-  factory _ConnectionTestResult.failure(String error) {
-    return _ConnectionTestResult._(success: false, errorMessage: error);
-  }
-}

lib/widgets/info_chip.dart

@@ -0,0 +1,49 @@
+import 'package:flutter/material.dart';
+
+class InfoChip extends StatelessWidget {
+  final IconData icon;
+  final String label;
+  final BuildContext context;
+  final bool fullWidth;
+
+  const InfoChip({
+    required this.icon,
+    required this.label,
+    required this.context,
+    this.fullWidth = false,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      width: fullWidth ? double.infinity : null,
+      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
+      decoration: BoxDecoration(
+        color: Theme.of(context).colorScheme.surfaceVariant.withOpacity(0.4),
+        borderRadius: BorderRadius.circular(8),
+      ),
+      child: Row(
+        mainAxisSize: fullWidth ? MainAxisSize.max : MainAxisSize.min,
+        children: [
+          Icon(
+            icon,
+            size: 14,
+            color: Theme.of(context).colorScheme.outline,
+          ),
+          const SizedBox(width: 4),
+          Flexible(
+            child: Text(
+              label,
+              style: TextStyle(
+                fontSize: 11,
+                color: Theme.of(context).colorScheme.outline,
+                fontWeight: FontWeight.w500,
+              ),
+              overflow: TextOverflow.ellipsis,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/widgets/supplement_card.dart

@@ -9,6 +9,7 @@ class SupplementCard extends StatefulWidget {
   final VoidCallback onEdit;
   final VoidCallback onDelete;
   final VoidCallback onArchive;
+  final VoidCallback onDuplicate;
 
   const SupplementCard({
     super.key,
@@ -17,6 +18,7 @@ class SupplementCard extends StatefulWidget {
     required this.onEdit,
     required this.onDelete,
     required this.onArchive,
+    required this.onDuplicate,
   });
 
   @override
@@ -42,7 +44,7 @@ class _SupplementCardState extends State<SupplementCard> {
               final unitsTaken = intake['unitsTaken'] ?? 1.0;
               return {
                 'time': '${takenAt.hour.toString().padLeft(2, '0')}:${takenAt.minute.toString().padLeft(2, '0')}',
-                'units': unitsTaken,
+                'units': unitsTaken is int ? unitsTaken.toDouble() : unitsTaken as double,
               };
             }).toList();
 
@@ -175,7 +177,7 @@ class _SupplementCardState extends State<SupplementCard> {
                             ),
                           ),
                         ElevatedButton(
-                          onPressed: isCompletelyTaken ? null : widget.onTake,
+                          onPressed: widget.onTake,
                           style: ElevatedButton.styleFrom(
                             backgroundColor: isCompletelyTaken
                                 ? Colors.green.shade500
@@ -209,6 +211,9 @@ class _SupplementCardState extends State<SupplementCard> {
                       case 'edit':
                         widget.onEdit();
                         break;
+                      case 'duplicate':
+                        widget.onDuplicate();
+                        break;
                       case 'archive':
                         widget.onArchive();
                         break;
@@ -218,6 +223,18 @@ class _SupplementCardState extends State<SupplementCard> {
                     }
                   },
                   itemBuilder: (context) => [
+                    if (isTakenToday)
+                      PopupMenuItem(
+                        value: 'take',
+                        onTap: widget.onTake,
+                        child: const Row(
+                          children: [
+                            Icon(Icons.add_circle_outline),
+                            SizedBox(width: 8),
+                            Text('Take Again'),
+                          ],
+                        ),
+                      ),
                     const PopupMenuItem(
                       value: 'edit',
                       child: Row(
@@ -228,6 +245,16 @@ class _SupplementCardState extends State<SupplementCard> {
                         ],
                       ),
                     ),
+                    const PopupMenuItem(
+                      value: 'duplicate',
+                      child: Row(
+                        children: [
+                          Icon(Icons.copy),
+                          SizedBox(width: 8),
+                          Text('Duplicate'),
+                        ],
+                      ),
+                    ),
                     const PopupMenuItem(
                       value: 'archive',
                       child: Row(
@@ -434,7 +461,7 @@ class _SupplementCardState extends State<SupplementCard> {
                   SizedBox(
                     width: double.infinity,
                     child: ElevatedButton.icon(
-                      onPressed: isCompletelyTaken ? null : widget.onTake,
+                      onPressed: widget.onTake,
                       icon: Icon(
                         isCompletelyTaken ? Icons.check_circle : Icons.medication,
                         size: 18,

linux/flutter/generated_plugin_registrant.cc

@@ -7,9 +7,13 @@
 #include "generated_plugin_registrant.h"
 
 #include <flutter_secure_storage_linux/flutter_secure_storage_linux_plugin.h>
+#include <url_launcher_linux/url_launcher_plugin.h>
 
 void fl_register_plugins(FlPluginRegistry* registry) {
   g_autoptr(FlPluginRegistrar) flutter_secure_storage_linux_registrar =
       fl_plugin_registry_get_registrar_for_plugin(registry, "FlutterSecureStorageLinuxPlugin");
   flutter_secure_storage_linux_plugin_register_with_registrar(flutter_secure_storage_linux_registrar);
+  g_autoptr(FlPluginRegistrar) url_launcher_linux_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "UrlLauncherPlugin");
+  url_launcher_plugin_register_with_registrar(url_launcher_linux_registrar);
 }

linux/flutter/generated_plugins.cmake

@@ -4,6 +4,7 @@
 
 list(APPEND FLUTTER_PLUGIN_LIST
   flutter_secure_storage_linux
+  url_launcher_linux
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -11,6 +11,7 @@ import flutter_secure_storage_darwin
 import path_provider_foundation
 import shared_preferences_foundation
 import sqflite_darwin
+import url_launcher_macos
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   ConnectivityPlusPlugin.register(with: registry.registrar(forPlugin: "ConnectivityPlusPlugin"))
@@ -19,4 +20,5 @@ func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
   SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))
   SqflitePlugin.register(with: registry.registrar(forPlugin: "SqflitePlugin"))
+  UrlLauncherPlugin.register(with: registry.registrar(forPlugin: "UrlLauncherPlugin"))
 }

pubspec.lock

@@ -638,6 +638,70 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.0"
+  url_launcher:
+    dependency: "direct main"
+    description:
+      name: url_launcher
+      sha256: f6a7e5c4835bb4e3026a04793a4199ca2d14c739ec378fdfe23fc8075d0439f8
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.3.2"
+  url_launcher_android:
+    dependency: transitive
+    description:
+      name: url_launcher_android
+      sha256: "69ee86740f2847b9a4ba6cffa74ed12ce500bbe2b07f3dc1e643439da60637b7"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.3.18"
+  url_launcher_ios:
+    dependency: transitive
+    description:
+      name: url_launcher_ios
+      sha256: d80b3f567a617cb923546034cc94bfe44eb15f989fe670b37f26abdb9d939cb7
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.3.4"
+  url_launcher_linux:
+    dependency: transitive
+    description:
+      name: url_launcher_linux
+      sha256: "4e9ba368772369e3e08f231d2301b4ef72b9ff87c31192ef471b380ef29a4935"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.1"
+  url_launcher_macos:
+    dependency: transitive
+    description:
+      name: url_launcher_macos
+      sha256: c043a77d6600ac9c38300567f33ef12b0ef4f4783a2c1f00231d2b1941fea13f
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.3"
+  url_launcher_platform_interface:
+    dependency: transitive
+    description:
+      name: url_launcher_platform_interface
+      sha256: "552f8a1e663569be95a8190206a38187b531910283c3e982193e4f2733f01029"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.2"
+  url_launcher_web:
+    dependency: transitive
+    description:
+      name: url_launcher_web
+      sha256: "4bd2b7b4dc4d4d0b94e5babfffbca8eac1a126c7f3d6ecbc1a11013faa3abba2"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  url_launcher_windows:
+    dependency: transitive
+    description:
+      name: url_launcher_windows
+      sha256: "3284b6d2ac454cf34f114e1d3319866fdd1e19cdc329999057e44ffe936cfa77"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.4"
   uuid:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -1,7 +1,7 @@
 name: supplements
 description: "A supplement tracking app for managing your daily supplements"
 publish_to: "none"
-version: 1.0.2+27082025
+version: 1.0.6+28082025
 
 environment:
   sdk: ^3.9.0
@@ -35,6 +35,7 @@ dependencies:
   flutter_secure_storage: ^10.0.0-beta.4
   uuid: ^4.5.1
   crypto: ^3.0.6
+  url_launcher: ^6.3.2
 
 dev_dependencies:
   flutter_test:
@@ -52,3 +53,6 @@ dependency_overrides:
 
 flutter:
   uses-material-design: true
+
+  assets:
+    - assets/canada_health.json

test/widget_test.dart

@@ -1,30 +0,0 @@
-// This is a basic Flutter widget test.
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility in the flutter_test package. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
-
-import 'package:flutter/material.dart';
-import 'package:flutter_test/flutter_test.dart';
-
-import 'package:supplements/main.dart';
-
-void main() {
-  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
-    // Build our app and trigger a frame.
-    await tester.pumpWidget(const MyApp());
-
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
-
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
-    await tester.pump();
-
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
-  });
-}

windows/flutter/generated_plugin_registrant.cc

@@ -8,10 +8,13 @@
 
 #include <connectivity_plus/connectivity_plus_windows_plugin.h>
 #include <flutter_secure_storage_windows/flutter_secure_storage_windows_plugin.h>
+#include <url_launcher_windows/url_launcher_windows.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
   ConnectivityPlusWindowsPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("ConnectivityPlusWindowsPlugin"));
   FlutterSecureStorageWindowsPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FlutterSecureStorageWindowsPlugin"));
+  UrlLauncherWindowsRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("UrlLauncherWindows"));
 }

windows/flutter/generated_plugins.cmake

@@ -5,6 +5,7 @@
 list(APPEND FLUTTER_PLUGIN_LIST
   connectivity_plus
   flutter_secure_storage_windows
+  url_launcher_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST