chore: bump version to 1.0.6+28082025

canada health values

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

@@ -1,15 +1,25 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
-import 'providers/supplement_provider.dart';
-import 'providers/settings_provider.dart';
-import 'screens/home_screen.dart';
 
-void main() {
-  runApp(const MyApp());
+import 'providers/settings_provider.dart';
+import 'providers/simple_sync_provider.dart';
+import 'providers/supplement_provider.dart';
+import 'screens/home_screen.dart';
+import 'screens/profile_setup_screen.dart';
+
+void main() async {
+  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) {
@@ -18,12 +28,41 @@ class MyApp extends StatelessWidget {
         ChangeNotifierProvider(
           create: (context) => SupplementProvider()..initialize(),
         ),
+        ChangeNotifierProvider.value(
+          value: settingsProvider,
+        ),
         ChangeNotifierProvider(
-          create: (context) => SettingsProvider()..initialize(),
+          create: (context) => SimpleSyncProvider(),
         ),
       ],
-      child: Consumer<SettingsProvider>(
-        builder: (context, settingsProvider, child) {
+      child: Consumer2<SettingsProvider, SimpleSyncProvider>(
+        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(
@@ -41,7 +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

@@ -1,14 +1,26 @@
+import '../services/database_sync_service.dart';
+
 class Ingredient {
   final int? id;
   final String name; // e.g., "Vitamin K2", "Vitamin D3"
   final double amount; // e.g., 75, 20
   final String unit; // e.g., "mcg", "mg", "IU"
 
+  // Sync metadata
+  final String syncId;
+  final DateTime lastModified;
+  final RecordSyncStatus syncStatus;
+  final bool isDeleted;
+
   const Ingredient({
     this.id,
     required this.name,
     required this.amount,
     required this.unit,
+    required this.syncId,
+    required this.lastModified,
+    this.syncStatus = RecordSyncStatus.pending,
+    this.isDeleted = false,
   });
 
   Map<String, dynamic> toMap() {
@@ -17,6 +29,10 @@ class Ingredient {
       'name': name,
       'amount': amount,
       'unit': unit,
+      'syncId': syncId,
+      'lastModified': lastModified.toIso8601String(),
+      'syncStatus': syncStatus.name,
+      'isDeleted': isDeleted ? 1 : 0,
     };
   }
 
@@ -26,6 +42,17 @@ class Ingredient {
       name: map['name'],
       amount: map['amount']?.toDouble() ?? 0.0,
       unit: map['unit'],
+      syncId: map['syncId'] ?? '',
+      lastModified: map['lastModified'] != null
+          ? DateTime.parse(map['lastModified'])
+          : DateTime.now(),
+      syncStatus: map['syncStatus'] != null
+          ? RecordSyncStatus.values.firstWhere(
+              (e) => e.name == map['syncStatus'],
+              orElse: () => RecordSyncStatus.pending,
+            )
+          : RecordSyncStatus.pending,
+      isDeleted: (map['isDeleted'] ?? 0) == 1,
     );
   }
 
@@ -34,12 +61,20 @@ class Ingredient {
     String? name,
     double? amount,
     String? unit,
+    String? syncId,
+    DateTime? lastModified,
+    RecordSyncStatus? syncStatus,
+    bool? isDeleted,
   }) {
     return Ingredient(
       id: id ?? this.id,
       name: name ?? this.name,
       amount: amount ?? this.amount,
       unit: unit ?? this.unit,
+      syncId: syncId ?? this.syncId,
+      lastModified: lastModified ?? this.lastModified,
+      syncStatus: syncStatus ?? this.syncStatus,
+      isDeleted: isDeleted ?? this.isDeleted,
     );
   }
 
@@ -54,11 +89,12 @@ class Ingredient {
     return other is Ingredient &&
         other.name == name &&
         other.amount == amount &&
-        other.unit == unit;
+        other.unit == unit &&
+        other.syncId == syncId;
   }
 
   @override
   int get hashCode {
-    return name.hashCode ^ amount.hashCode ^ unit.hashCode;
+    return name.hashCode ^ amount.hashCode ^ unit.hashCode ^ syncId.hashCode;
   }
 }

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

@@ -1,6 +1,10 @@
-import 'ingredient.dart';
 import 'dart:convert';
 
+import 'package:uuid/uuid.dart';
+
+import '../services/database_sync_service.dart';
+import 'ingredient.dart';
+
 class Supplement {
   final int? id;
   final String name;
@@ -14,6 +18,12 @@ class Supplement {
   final DateTime createdAt;
   final bool isActive;
 
+  // Sync metadata
+  final String syncId;
+  final DateTime lastModified;
+  final RecordSyncStatus syncStatus;
+  final bool isDeleted;
+
   Supplement({
     this.id,
     required this.name,
@@ -26,7 +36,12 @@ class Supplement {
     this.notes,
     required this.createdAt,
     this.isActive = true,
-  });
+    String? syncId,
+    DateTime? lastModified,
+    this.syncStatus = RecordSyncStatus.pending,
+    this.isDeleted = false,
+  }) : syncId = syncId ?? const Uuid().v4(),
+       lastModified = lastModified ?? DateTime.now();
 
   // Helper getters
   double get totalDosagePerIntake {
@@ -40,7 +55,7 @@ class Supplement {
     if (ingredients.isEmpty) {
       return 'No ingredients specified';
     }
-    return ingredients.map((ingredient) => 
+    return ingredients.map((ingredient) =>
       '${ingredient.amount * numberOfUnits}${ingredient.unit} ${ingredient.name}'
     ).join(', ');
   }
@@ -54,8 +69,7 @@ class Supplement {
   }
 
   Map<String, dynamic> toMap() {
-    return {
-      'id': id,
+    final map = <String, dynamic>{
       'name': name,
       'brand': brand,
       'ingredients': jsonEncode(ingredients.map((ingredient) => ingredient.toMap()).toList()),
@@ -66,12 +80,22 @@ class Supplement {
       'notes': notes,
       'createdAt': createdAt.toIso8601String(),
       'isActive': isActive ? 1 : 0,
+      'syncId': syncId,
+      'lastModified': lastModified.toIso8601String(),
+      'syncStatus': syncStatus.name,
+      'isDeleted': isDeleted ? 1 : 0,
     };
+
+    if (id != null) {
+      map['id'] = id;
+    }
+
+    return map;
   }
 
   factory Supplement.fromMap(Map<String, dynamic> map) {
     List<Ingredient> ingredients = [];
-    
+
     // Try to parse ingredients if they exist
     if (map['ingredients'] != null && map['ingredients'].isNotEmpty) {
       try {
@@ -98,11 +122,23 @@ class Supplement {
       notes: map['notes'],
       createdAt: DateTime.parse(map['createdAt']),
       isActive: map['isActive'] == 1,
+      syncId: map['syncId'] ?? const Uuid().v4(),
+      lastModified: map['lastModified'] != null
+          ? DateTime.parse(map['lastModified'])
+          : DateTime.now(),
+      syncStatus: map['syncStatus'] != null
+          ? RecordSyncStatus.values.firstWhere(
+              (e) => e.name == map['syncStatus'],
+              orElse: () => RecordSyncStatus.pending,
+            )
+          : RecordSyncStatus.pending,
+      isDeleted: (map['isDeleted'] ?? 0) == 1,
     );
   }
 
   Supplement copyWith({
     int? id,
+    bool setNullId = false,
     String? name,
     String? brand,
     List<Ingredient>? ingredients,
@@ -113,9 +149,14 @@ class Supplement {
     String? notes,
     DateTime? createdAt,
     bool? isActive,
+    String? syncId,
+    bool newSyncId = false,
+    DateTime? lastModified,
+    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,
@@ -126,6 +167,34 @@ class Supplement {
       notes: notes ?? this.notes,
       createdAt: createdAt ?? this.createdAt,
       isActive: isActive ?? this.isActive,
+      syncId: newSyncId ? null : (syncId ?? this.syncId),
+      lastModified: lastModified ?? this.lastModified,
+      syncStatus: syncStatus ?? this.syncStatus,
+      isDeleted: isDeleted ?? this.isDeleted,
+    );
+  }
+
+  /// Create a new supplement with updated sync status and timestamp
+  Supplement markAsModified() {
+    return copyWith(
+      lastModified: DateTime.now(),
+      syncStatus: RecordSyncStatus.modified,
+    );
+  }
+
+  /// Create a new supplement marked as synced
+  Supplement markAsSynced() {
+    return copyWith(
+      syncStatus: RecordSyncStatus.synced,
+    );
+  }
+
+  /// Create a new supplement marked for deletion
+  Supplement markAsDeleted() {
+    return copyWith(
+      isDeleted: true,
+      lastModified: DateTime.now(),
+      syncStatus: RecordSyncStatus.modified,
     );
   }
 }

lib/models/supplement_intake.dart

@@ -1,3 +1,7 @@
+import 'package:uuid/uuid.dart';
+
+import '../services/database_sync_service.dart';
+
 class SupplementIntake {
   final int? id;
   final int supplementId;
@@ -6,6 +10,12 @@ class SupplementIntake {
   final double unitsTaken; // Number of units taken (can be fractional)
   final String? notes;
 
+  // Sync metadata
+  final String syncId;
+  final DateTime lastModified;
+  final RecordSyncStatus syncStatus;
+  final bool isDeleted;
+
   SupplementIntake({
     this.id,
     required this.supplementId,
@@ -13,7 +23,12 @@ class SupplementIntake {
     required this.dosageTaken,
     required this.unitsTaken,
     this.notes,
-  });
+    String? syncId,
+    DateTime? lastModified,
+    this.syncStatus = RecordSyncStatus.pending,
+    this.isDeleted = false,
+  }) : syncId = syncId ?? const Uuid().v4(),
+       lastModified = lastModified ?? DateTime.now();
 
   Map<String, dynamic> toMap() {
     return {
@@ -23,6 +38,10 @@ class SupplementIntake {
       'dosageTaken': dosageTaken,
       'unitsTaken': unitsTaken,
       'notes': notes,
+      'syncId': syncId,
+      'lastModified': lastModified.toIso8601String(),
+      'syncStatus': syncStatus.name,
+      'isDeleted': isDeleted ? 1 : 0,
     };
   }
 
@@ -34,6 +53,17 @@ class SupplementIntake {
       dosageTaken: map['dosageTaken'],
       unitsTaken: (map['unitsTaken'] ?? 1).toDouble(), // Default for backwards compatibility
       notes: map['notes'],
+      syncId: map['syncId'] ?? const Uuid().v4(),
+      lastModified: map['lastModified'] != null
+          ? DateTime.parse(map['lastModified'])
+          : DateTime.now(),
+      syncStatus: map['syncStatus'] != null
+          ? RecordSyncStatus.values.firstWhere(
+              (e) => e.name == map['syncStatus'],
+              orElse: () => RecordSyncStatus.pending,
+            )
+          : RecordSyncStatus.pending,
+      isDeleted: (map['isDeleted'] ?? 0) == 1,
     );
   }
 
@@ -44,6 +74,10 @@ class SupplementIntake {
     double? dosageTaken,
     double? unitsTaken,
     String? notes,
+    String? syncId,
+    DateTime? lastModified,
+    RecordSyncStatus? syncStatus,
+    bool? isDeleted,
   }) {
     return SupplementIntake(
       id: id ?? this.id,
@@ -52,6 +86,26 @@ class SupplementIntake {
       dosageTaken: dosageTaken ?? this.dosageTaken,
       unitsTaken: unitsTaken ?? this.unitsTaken,
       notes: notes ?? this.notes,
+      syncId: syncId ?? this.syncId,
+      lastModified: lastModified ?? this.lastModified,
+      syncStatus: syncStatus ?? this.syncStatus,
+      isDeleted: isDeleted ?? this.isDeleted,
+    );
+  }
+
+  /// Create a new intake marked as synced
+  SupplementIntake markAsSynced() {
+    return copyWith(
+      syncStatus: RecordSyncStatus.synced,
+    );
+  }
+
+  /// Create a new intake marked for deletion
+  SupplementIntake markAsDeleted() {
+    return copyWith(
+      isDeleted: true,
+      lastModified: DateTime.now(),
+      syncStatus: RecordSyncStatus.modified,
     );
   }
 }

lib/providers/settings_provider.dart

@@ -9,7 +9,11 @@ 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;
@@ -19,14 +23,31 @@ class SettingsProvider extends ChangeNotifier {
   int _eveningEnd = 22;
   int _nightStart = 23;
   int _nightEnd = 4;
-  
+
   // Persistent reminder settings
   bool _persistentReminders = true;
   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;
@@ -36,22 +57,26 @@ class SettingsProvider extends ChangeNotifier {
   int get eveningEnd => _eveningEnd;
   int get nightStart => _nightStart;
   int get nightEnd => _nightEnd;
-  
+
   // Persistent reminder getters
   bool get persistentReminders => _persistentReminders;
   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)} - ${_formatHour((_afternoonEnd + 1) % 24)}';
   String get eveningRange => '${_formatHour(_eveningStart)} - ${_formatHour((_eveningEnd + 1) % 24)}';
   String get nightRange => '${_formatHour(_nightStart)} - ${_formatHour((_nightEnd + 1) % 24)}';
-  
+
   String _formatHour(int hour) {
     return '${hour.toString().padLeft(2, '0')}:00';
   }
-  
+
   ThemeMode get themeMode {
     switch (_themeOption) {
       case ThemeOption.light:
@@ -67,7 +92,14 @@ class SettingsProvider extends ChangeNotifier {
     final prefs = await SharedPreferences.getInstance();
     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;
@@ -77,23 +109,37 @@ class SettingsProvider extends ChangeNotifier {
     _eveningEnd = prefs.getInt('evening_end') ?? 22;
     _nightStart = prefs.getInt('night_start') ?? 23;
     _nightEnd = prefs.getInt('night_end') ?? 4;
-    
+
     // Load persistent reminder settings
     _persistentReminders = prefs.getBool('persistent_reminders') ?? true;
     _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();
   }
 
   Future<void> setThemeOption(ThemeOption option) async {
     _themeOption = option;
     notifyListeners();
-    
+
     final prefs = await SharedPreferences.getInstance();
     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,
@@ -146,14 +192,14 @@ class SettingsProvider extends ChangeNotifier {
     if (morningStart > morningEnd) return false;
     if (afternoonStart > afternoonEnd) return false;
     if (eveningStart > eveningEnd) return false;
-    
+
     // Night can wrap around midnight, so we allow nightStart > nightEnd
-    
+
     // Check for overlaps in sequential periods
     if (morningEnd >= afternoonStart) return false;
     if (afternoonEnd >= eveningStart) return false;
     if (eveningEnd >= nightStart) return false;
-    
+
     return true;
   }
 
@@ -174,7 +220,7 @@ class SettingsProvider extends ChangeNotifier {
     int afternoonCount = 0;
     int eveningCount = 0;
     int nightCount = 0;
-    
+
     for (final hour in hours) {
       if (hour >= _morningStart && hour <= _morningEnd) {
         morningCount++;
@@ -186,13 +232,13 @@ class SettingsProvider extends ChangeNotifier {
         nightCount++;
       }
     }
-    
+
     // If supplement is taken throughout the day (has times in multiple periods)
-    final periodsCount = (morningCount > 0 ? 1 : 0) + 
-                        (afternoonCount > 0 ? 1 : 0) + 
-                        (eveningCount > 0 ? 1 : 0) + 
+    final periodsCount = (morningCount > 0 ? 1 : 0) +
+                        (afternoonCount > 0 ? 1 : 0) +
+                        (eveningCount > 0 ? 1 : 0) +
                         (nightCount > 0 ? 1 : 0);
-    
+
     if (periodsCount >= 2) {
       // Categorize based on the earliest reminder time for consistency
       final earliestHour = hours.reduce((a, b) => a < b ? a : b);
@@ -206,7 +252,7 @@ class SettingsProvider extends ChangeNotifier {
         return 'night';
       }
     }
-    
+
     // If all times are in one period, categorize accordingly
     if (morningCount > 0) {
       return 'morning';
@@ -236,7 +282,7 @@ class SettingsProvider extends ChangeNotifier {
   Future<void> setPersistentReminders(bool enabled) async {
     _persistentReminders = enabled;
     notifyListeners();
-    
+
     final prefs = await SharedPreferences.getInstance();
     await prefs.setBool('persistent_reminders', enabled);
   }
@@ -244,7 +290,7 @@ class SettingsProvider extends ChangeNotifier {
   Future<void> setReminderRetryInterval(int minutes) async {
     _reminderRetryInterval = minutes;
     notifyListeners();
-    
+
     final prefs = await SharedPreferences.getInstance();
     await prefs.setInt('reminder_retry_interval', minutes);
   }
@@ -252,8 +298,25 @@ class SettingsProvider extends ChangeNotifier {
   Future<void> setMaxRetryAttempts(int attempts) async {
     _maxRetryAttempts = attempts;
     notifyListeners();
-    
+
     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

@@ -1,10 +1,13 @@
 import 'dart:async';
+
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 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 {
@@ -19,56 +22,69 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
   Timer? _dateChangeTimer;
   DateTime _lastDateCheck = DateTime.now();
 
+  // Callback for triggering sync when data changes
+  VoidCallback? _onDataChanged;
+
   List<Supplement> get supplements => _supplements;
   List<Map<String, dynamic>> get todayIntakes => _todayIntakes;
   List<Map<String, dynamic>> get monthlyIntakes => _monthlyIntakes;
   bool get isLoading => _isLoading;
 
+  /// Set callback for triggering sync when data changes
+  void setOnDataChangedCallback(VoidCallback? callback) {
+    _onDataChanged = callback;
+  }
+
+  /// Trigger sync if callback is set
+  void _triggerSyncIfEnabled() {
+    _onDataChanged?.call();
+  }
+
   Future<void> initialize() async {
     // Add this provider as an observer for app lifecycle changes
     WidgetsBinding.instance.addObserver(this);
-    
+
     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('📱 Supplement ID: $supplementId');
-      print('📱 Supplement Name: $supplementName');
-      print('📱 Units: $units');
-      print('📱 Unit Type: $unitType');
-      
+      print('SupplementsLog: 📱 === NOTIFICATION CALLBACK TRIGGERED ===');
+      print('SupplementsLog: 📱 Supplement ID: $supplementId');
+      print('SupplementsLog: 📱 Supplement Name: $supplementName');
+      print('SupplementsLog: 📱 Units: $units');
+      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('📱 === CALLBACK COMPLETE ===');
-      
+      print('SupplementsLog: 📱 Intake recorded successfully');
+      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
     }
-    
+
     await loadSupplements();
     await loadTodayIntakes();
-    
+
     // Reschedule notifications for all active supplements to ensure persistence
     await _rescheduleAllNotifications();
-    
+
     // Start periodic checking for persistent reminders (every 5 minutes)
     _startPersistentReminderCheck();
-    
+
     // Start date change monitoring to reset daily intake status
     _startDateChangeMonitoring();
   }
@@ -76,7 +92,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
   void _startPersistentReminderCheck() {
     // Cancel any existing timer
     _persistentReminderTimer?.cancel();
-    
+
     // Check every 5 minutes for persistent reminders
     _persistentReminderTimer = Timer.periodic(const Duration(minutes: 5), (timer) async {
       try {
@@ -84,11 +100,11 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
         await _checkPersistentReminders();
       } catch (e) {
         if (kDebugMode) {
-          print('Error checking persistent reminders: $e');
+          print('SupplementsLog: Error checking persistent reminders: $e');
         }
       }
     });
-    
+
     // Also check immediately
     _checkPersistentReminders();
   }
@@ -96,25 +112,25 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
   void _startDateChangeMonitoring() {
     // Cancel any existing timer
     _dateChangeTimer?.cancel();
-    
+
     // Check every minute if the date has changed
     _dateChangeTimer = Timer.periodic(const Duration(minutes: 1), (timer) async {
       final now = DateTime.now();
       final currentDate = DateTime(now.year, now.month, now.day);
       final lastCheckDate = DateTime(_lastDateCheck.year, _lastDateCheck.month, _lastDateCheck.day);
-      
+
       if (currentDate != lastCheckDate) {
         if (kDebugMode) {
-          print('Date changed detected: ${lastCheckDate} -> ${currentDate}');
-          print('Refreshing today\'s intakes for new day...');
+          print('SupplementsLog: Date changed detected: ${lastCheckDate} -> ${currentDate}');
+          print('SupplementsLog: Refreshing today\'s intakes for new day...');
         }
-        
+
         // Date has changed, refresh today's intakes
         _lastDateCheck = now;
         await loadTodayIntakes();
-        
+
         if (kDebugMode) {
-          print('Today\'s intakes refreshed for new day');
+          print('SupplementsLog: Today\'s intakes refreshed for new day');
         }
       }
     });
@@ -125,7 +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');
     }
   }
 
@@ -135,7 +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,
@@ -145,7 +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
@@ -164,11 +180,11 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
   @override
   void didChangeAppLifecycleState(AppLifecycleState state) {
     super.didChangeAppLifecycleState(state);
-    
+
     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();
     }
@@ -176,23 +192,23 @@ 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) {
       if (supplement.reminderTimes.isNotEmpty) {
         try {
           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');
     }
   }
 
@@ -201,16 +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;
@@ -220,25 +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;
     }
@@ -247,14 +266,39 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
   Future<void> updateSupplement(Supplement supplement) async {
     try {
       await _databaseHelper.updateSupplement(supplement);
-      
+
       // Reschedule notifications
       await _notificationService.scheduleSupplementReminders(supplement);
-      
+
       await loadSupplements();
+
+      // Trigger sync after updating supplement
+      _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');
       }
     }
   }
@@ -262,14 +306,17 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
   Future<void> deleteSupplement(int id) async {
     try {
       await _databaseHelper.deleteSupplement(id);
-      
+
       // Cancel notifications
       await _notificationService.cancelSupplementReminders(id);
-      
+
       await loadSupplements();
+
+      // Trigger sync after deleting supplement
+      _triggerSyncIfEnabled();
     } catch (e) {
       if (kDebugMode) {
-        print('Error deleting supplement: $e');
+        print('SupplementsLog: Error deleting supplement: $e');
       }
     }
   }
@@ -286,7 +333,10 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
 
       await _databaseHelper.insertIntake(intake);
       await loadTodayIntakes();
-      
+
+      // Trigger sync after recording intake
+      _triggerSyncIfEnabled();
+
       // Show confirmation notification
       final supplement = _supplements.firstWhere((s) => s.id == supplementId);
       final unitsText = unitsTaken != null && unitsTaken != 1 ? '${unitsTaken.toStringAsFixed(unitsTaken % 1 == 0 ? 0 : 1)} ${supplement.unitType}' : '';
@@ -296,7 +346,7 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       );
     } catch (e) {
       if (kDebugMode) {
-        print('Error recording intake: $e');
+        print('SupplementsLog: Error recording intake: $e');
       }
     }
   }
@@ -305,22 +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');
       }
     }
   }
@@ -331,7 +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');
       }
     }
   }
@@ -341,7 +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 [];
     }
@@ -356,9 +406,31 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
         await loadMonthlyIntakes(DateTime.now().year, DateTime.now().month);
       }
       notifyListeners();
+
+      // Trigger sync after deleting intake
+      _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');
       }
     }
   }
@@ -371,10 +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();
@@ -385,22 +473,22 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     final now = DateTime.now();
     final currentDate = DateTime(now.year, now.month, now.day);
     final lastCheckDate = DateTime(_lastDateCheck.year, _lastDateCheck.month, _lastDateCheck.day);
-    
+
     if (kDebugMode) {
-      print('Force checking date change...');
-      print('Current date: $currentDate');
-      print('Last check date: $lastCheckDate');
+      print('SupplementsLog: Force checking date change...');
+      print('SupplementsLog: Current date: $currentDate');
+      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');
       }
     }
   }
@@ -415,7 +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');
       }
     }
   }
@@ -425,9 +513,12 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       await _databaseHelper.archiveSupplement(supplementId);
       await loadSupplements(); // Refresh active supplements
       await loadArchivedSupplements(); // Refresh archived supplements
+
+      // Trigger sync after archiving supplement
+      _triggerSyncIfEnabled();
     } catch (e) {
       if (kDebugMode) {
-        print('Error archiving supplement: $e');
+        print('SupplementsLog: Error archiving supplement: $e');
       }
     }
   }
@@ -437,20 +528,26 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
       await _databaseHelper.unarchiveSupplement(supplementId);
       await loadSupplements(); // Refresh active supplements
       await loadArchivedSupplements(); // Refresh archived supplements
+
+      // Trigger sync after unarchiving supplement
+      _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 permanently deleting archived supplement
+      _triggerSyncIfEnabled();
     } catch (e) {
       if (kDebugMode) {
-        print('Error deleting archived supplement: $e');
+        print('SupplementsLog: Error permanently deleting archived supplement: $e');
       }
     }
   }

lib/screens/add_supplement_screen.dart

@@ -1,8 +1,12 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
-import '../models/supplement.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 {
@@ -22,6 +26,8 @@ class IngredientController {
       name: nameController.text.trim(),
       amount: double.tryParse(amountController.text) ?? 0.0,
       unit: selectedUnit,
+      syncId: const Uuid().v4(),
+      lastModified: DateTime.now(),
     );
   }
 
@@ -46,10 +52,14 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
   final _brandController = TextEditingController();
   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 = [];
-  
+
   String _selectedUnitType = 'capsules';
   int _frequencyPerDay = 1;
   List<String> _reminderTimes = ['08:00'];
@@ -195,7 +205,7 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
     _selectedUnitType = supplement.unitType;
     _frequencyPerDay = supplement.frequencyPerDay;
     _reminderTimes = List.from(supplement.reminderTimes);
-    
+
     // Initialize ingredient controllers from existing ingredients
     _ingredientControllers.clear();
     if (supplement.ingredients.isEmpty) {
@@ -220,6 +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,
@@ -478,17 +495,7 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
               ),
               const SizedBox(height: 24),
 
-              // Save button
-              SizedBox(
-                width: double.infinity,
-                child: ElevatedButton(
-                  onPressed: _saveSupplement,
-                  style: ElevatedButton.styleFrom(
-                    padding: const EdgeInsets.all(16),
-                  ),
-                  child: Text(isEditing ? 'Update Supplement' : 'Add Supplement'),
-                ),
-              ),
+              // Save is now in the AppBar for consistency with app-wide pattern
             ],
           ),
         ),
@@ -556,19 +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) => 
-        controller.nameController.text.trim().isNotEmpty && 
-        (double.tryParse(controller.amountController.text) ?? 0) > 0
-      ).map((controller) => Ingredient(
-        name: controller.nameController.text.trim(),
-        amount: double.tryParse(controller.amountController.text) ?? 0,
-        unit: controller.selectedUnit,
-      )).toList();
+      final validIngredients = _ingredientControllers
+          .where((controller) =>
+              controller.nameController.text.trim().isNotEmpty &&
+              (double.tryParse(controller.amountController.text) ?? 0) > 0)
+          .map((controller) => Ingredient(
+                name: controller.nameController.text.trim(),
+                amount: double.tryParse(controller.amountController.text) ?? 0.0,
+                unit: controller.selectedUnit,
+                syncId: const Uuid().v4(),
+                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;
@@ -577,18 +589,24 @@ 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>();
-      
+
       try {
         if (widget.supplement != null) {
           await provider.updateSupplement(supplement);
@@ -598,10 +616,10 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
 
         if (mounted) {
           Navigator.of(context).pop();
-          
+
           ScaffoldMessenger.of(context).showSnackBar(
             SnackBar(
-              content: Text(widget.supplement != null 
+              content: Text(widget.supplement != null
                   ? 'Supplement updated successfully!'
                   : 'Supplement added successfully!'),
               backgroundColor: Colors.green,
@@ -627,12 +645,12 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
     _brandController.dispose();
     _numberOfUnitsController.dispose();
     _notesController.dispose();
-    
+
     // Dispose all ingredient controllers
     for (final controller in _ingredientControllers) {
       controller.dispose();
     }
-    
+
     super.dispose();
   }
 }

lib/screens/archived_supplements_screen.dart

@@ -1,7 +1,9 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
-import '../providers/supplement_provider.dart';
+import 'package:supplements/widgets/info_chip.dart';
+
 import '../models/supplement.dart';
+import '../providers/supplement_provider.dart';
 
 class ArchivedSupplementsScreen extends StatefulWidget {
   const ArchivedSupplementsScreen({super.key});
@@ -254,7 +256,7 @@ class _ArchivedSupplementCard extends StatelessWidget {
                 ],
               ),
               const SizedBox(height: 16),
-              
+
               // Supplement details in a muted style
               if (supplement.ingredients.isNotEmpty) ...[
                 Container(
@@ -301,27 +303,27 @@ class _ArchivedSupplementCard extends StatelessWidget {
                 ),
                 const SizedBox(height: 12),
               ],
-              
+
               // 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,
                   ),
                 ],
               ),
-              
+
               if (supplement.reminderTimes.isNotEmpty) ...[
                 const SizedBox(height: 8),
-                _InfoChip(
+                InfoChip(
                   icon: Icons.notifications_off,
                   label: 'Was: ${supplement.reminderTimes.join(', ')}',
                   context: context,
@@ -335,51 +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

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
-import 'package:provider/provider.dart';
 import 'package:intl/intl.dart';
+import 'package:provider/provider.dart';
+
+import '../providers/settings_provider.dart';
 import '../providers/supplement_provider.dart';
 
 class HistoryScreen extends StatefulWidget {
@@ -106,7 +108,7 @@ class _HistoryScreenState extends State<HistoryScreen> {
               return LayoutBuilder(
                 builder: (context, constraints) {
                   final isWideScreen = constraints.maxWidth > 800;
-                  
+
                   if (isWideScreen) {
                     // Desktop/tablet layout: side-by-side
                     return Row(
@@ -124,27 +126,33 @@ class _HistoryScreenState extends State<HistoryScreen> {
                         Expanded(
                           flex: 3,
                           child: Container(
-                            margin: const EdgeInsets.fromLTRB(0, 16, 16, 16),
-                            child: _buildSelectedDayDetails(groupedIntakes),
+                            // add a bit more horizontal spacing between calendar and card
+                            margin: const EdgeInsets.fromLTRB(8, 16, 16, 16),
+                            child: SingleChildScrollView(
+                              child: _buildSelectedDayDetails(groupedIntakes),
+                            ),
                           ),
                         ),
                       ],
                     );
                   } else {
                     // Mobile layout: vertical stack
-                    return Column(
-                      children: [
-                        // Calendar
-                        Container(
-                          margin: const EdgeInsets.symmetric(horizontal: 16),
-                          child: _buildCalendar(groupedIntakes),
-                        ),
-                        const SizedBox(height: 16),
-                        // Selected day details
-                        Expanded(
-                          child: _buildSelectedDayDetails(groupedIntakes),
-                        ),
-                      ],
+                    return SingleChildScrollView(
+                      child: Column(
+                        children: [
+                          // Calendar
+                          Container(
+                            margin: const EdgeInsets.symmetric(horizontal: 16),
+                            child: _buildCalendar(groupedIntakes),
+                          ),
+                          const SizedBox(height: 16),
+                          // Selected day details
+                          Container(
+                            margin: const EdgeInsets.symmetric(horizontal: 16),
+                            child: _buildSelectedDayDetails(groupedIntakes),
+                          ),
+                        ],
+                      ),
                     );
                   }
                 },
@@ -177,7 +185,7 @@ class _HistoryScreenState extends State<HistoryScreen> {
         );
       },
     );
-    
+
     if (picked != null) {
       setState(() {
         _selectedMonth = picked.month;
@@ -203,13 +211,13 @@ class _HistoryScreenState extends State<HistoryScreen> {
             onPressed: () async {
               await context.read<SupplementProvider>().deleteIntake(intakeId);
               Navigator.of(context).pop();
-              
+
               // Force refresh of the UI
               setState(() {});
-              
+
               // Force refresh of the current view data
               context.read<SupplementProvider>().loadMonthlyIntakes(_selectedYear, _selectedMonth);
-              
+
               ScaffoldMessenger.of(context).showSnackBar(
                 SnackBar(
                   content: Text('$supplementName intake deleted'),
@@ -230,11 +238,11 @@ class _HistoryScreenState extends State<HistoryScreen> {
     final lastDayOfMonth = DateTime(_selectedYear, _selectedMonth + 1, 0);
     final firstWeekday = firstDayOfMonth.weekday;
     final daysInMonth = lastDayOfMonth.day;
-    
+
     // Calculate how many cells we need (including empty ones for alignment)
     final totalCells = ((daysInMonth + firstWeekday - 1) / 7).ceil() * 7;
     final weeks = (totalCells / 7).ceil();
-    
+
     return LayoutBuilder(
       builder: (context, constraints) {
         final isWideScreen = constraints.maxWidth > 800;
@@ -242,7 +250,7 @@ class _HistoryScreenState extends State<HistoryScreen> {
         final cellHeight = isWideScreen ? 56.0 : 48.0;
         final calendarContentHeight = (weeks * cellHeight) + 60; // +60 for headers and padding
         final calendarHeight = isWideScreen ? 400.0 : calendarContentHeight;
-        
+
         return Card(
           child: Container(
             height: calendarHeight,
@@ -283,11 +291,11 @@ class _HistoryScreenState extends State<HistoryScreen> {
                       itemCount: totalCells,
                       itemBuilder: (context, index) {
                         final dayNumber = index - firstWeekday + 2;
-                        
+
                         if (dayNumber < 1 || dayNumber > daysInMonth) {
                           return const SizedBox(); // Empty cell
                         }
-                        
+
                         final date = DateTime(_selectedYear, _selectedMonth, dayNumber);
                         final dateKey = DateFormat('yyyy-MM-dd').format(date);
                         final hasIntakes = groupedIntakes.containsKey(dateKey);
@@ -295,7 +303,7 @@ class _HistoryScreenState extends State<HistoryScreen> {
                         final isSelected = _selectedDay != null &&
                                            DateFormat('yyyy-MM-dd').format(_selectedDay!) == dateKey;
                         final isToday = DateFormat('yyyy-MM-dd').format(DateTime.now()) == dateKey;
-                        
+
                         return GestureDetector(
                           onTap: () {
                             setState(() {
@@ -305,12 +313,12 @@ class _HistoryScreenState extends State<HistoryScreen> {
                           child: Container(
                             margin: const EdgeInsets.all(1),
                             decoration: BoxDecoration(
-                              color: isSelected 
+                              color: isSelected
                                   ? Theme.of(context).colorScheme.primary
-                                  : hasIntakes 
+                                  : hasIntakes
                                       ? Theme.of(context).colorScheme.primaryContainer
                                       : null,
-                              border: isToday 
+                              border: isToday
                                   ? Border.all(color: Theme.of(context).colorScheme.secondary, width: 2)
                                   : null,
                               borderRadius: BorderRadius.circular(8),
@@ -321,9 +329,9 @@ class _HistoryScreenState extends State<HistoryScreen> {
                                   child: Text(
                                     '$dayNumber',
                                     style: TextStyle(
-                                      color: isSelected 
+                                      color: isSelected
                                           ? Theme.of(context).colorScheme.onPrimary
-                                          : hasIntakes 
+                                          : hasIntakes
                                               ? Theme.of(context).colorScheme.onPrimaryContainer
                                               : Theme.of(context).colorScheme.onSurface,
                                       fontWeight: isToday ? FontWeight.bold : FontWeight.normal,
@@ -338,7 +346,7 @@ class _HistoryScreenState extends State<HistoryScreen> {
                                     child: Container(
                                       padding: EdgeInsets.all(isWideScreen ? 3 : 2),
                                       decoration: BoxDecoration(
-                                        color: isSelected 
+                                        color: isSelected
                                             ? Theme.of(context).colorScheme.onPrimary
                                             : Theme.of(context).colorScheme.primary,
                                         borderRadius: BorderRadius.circular(8),
@@ -350,7 +358,7 @@ class _HistoryScreenState extends State<HistoryScreen> {
                                       child: Text(
                                         '$intakeCount',
                                         style: TextStyle(
-                                          color: isSelected 
+                                          color: isSelected
                                               ? Theme.of(context).colorScheme.primary
                                               : Theme.of(context).colorScheme.onPrimary,
                                           fontSize: isWideScreen ? 11 : 10,
@@ -380,7 +388,7 @@ class _HistoryScreenState extends State<HistoryScreen> {
     return LayoutBuilder(
       builder: (context, constraints) {
         final isWideScreen = constraints.maxWidth > 600;
-        
+
         if (_selectedDay == null) {
           return Card(
             child: Center(
@@ -478,78 +486,208 @@ class _HistoryScreenState extends State<HistoryScreen> {
                   ],
                 ),
               ),
-              Expanded(
-                child: ListView.builder(
-                  padding: EdgeInsets.all(isWideScreen ? 20 : 16),
-                  itemCount: dayIntakes.length,
-                  itemBuilder: (context, index) {
-                    final intake = dayIntakes[index];
-                    final takenAt = DateTime.parse(intake['takenAt']);
-                    final units = (intake['unitsTaken'] as num?)?.toDouble() ?? 1.0;
-
-                    return Card(
-                      margin: const EdgeInsets.only(bottom: 12),
-                      elevation: 2,
-                      child: Padding(
-                        padding: EdgeInsets.all(isWideScreen ? 16 : 12),
+              Padding(
+                padding: EdgeInsets.all(isWideScreen ? 20 : 16),
+                child: Builder(
+                  builder: (context) {
+                    final settingsProvider = Provider.of<SettingsProvider>(context, listen: false);
+                    // Sort once per render
+                    final sortedDayIntakes = List<Map<String, dynamic>>.from(dayIntakes)
+                      ..sort((a, b) => DateTime.parse(a['takenAt']).compareTo(DateTime.parse(b['takenAt'])));
+                    // Helpers
+                    String timeCategory(DateTime dt) {
+                      final h = dt.hour;
+                      if (h >= settingsProvider.morningStart && h <= settingsProvider.morningEnd) return 'morning';
+                      if (h >= settingsProvider.afternoonStart && h <= settingsProvider.afternoonEnd) return 'afternoon';
+                      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(
-                              backgroundColor: Theme.of(context).colorScheme.primary,
-                              radius: isWideScreen ? 24 : 20,
+                            Container(
+                              padding: const EdgeInsets.all(8),
+                              decoration: BoxDecoration(
+                                color: color.withOpacity(0.2),
+                                shape: BoxShape.circle,
+                              ),
                               child: Icon(
-                                Icons.medication,
-                                color: Theme.of(context).colorScheme.onPrimary,
-                                size: isWideScreen ? 24 : 20,
+                                icon,
+                                size: 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: isWideScreen ? 16 : 14,
+                                      fontSize: 18,
+                                      fontWeight: FontWeight.bold,
+                                      color: color,
                                     ),
                                   ),
-                                  const SizedBox(height: 4),
-                                  Text(
-                                    '${units.toStringAsFixed(units % 1 == 0 ? 0 : 1)} ${intake['supplementUnitType'] ?? 'units'} at ${DateFormat('HH:mm').format(takenAt)}',
-                                    style: TextStyle(
-                                      color: Theme.of(context).colorScheme.primary,
-                                      fontWeight: FontWeight.w500,
-                                      fontSize: isWideScreen ? 14 : 12,
-                                    ),
-                                  ),
-                                  if (intake['notes'] != null && intake['notes'].toString().isNotEmpty) ...[
-                                    const SizedBox(height: 4),
+                                  if (range != null) ...[
                                     Text(
-                                      intake['notes'],
+                                      '($range)',
                                       style: TextStyle(
-                                        fontSize: isWideScreen ? 13 : 12,
-                                        fontStyle: FontStyle.italic,
-                                        color: Theme.of(context).colorScheme.onSurfaceVariant,
+                                        fontSize: 12,
+                                        fontWeight: FontWeight.w500,
+                                        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

@@ -1,9 +1,10 @@
 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 'profile_setup_screen.dart';
+import 'simple_sync_settings_screen.dart';
 
 class SettingsScreen extends StatelessWidget {
   const SettingsScreen({super.key});
@@ -19,6 +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),
@@ -68,6 +101,102 @@ 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(
+                            '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),
               Card(
                 child: Padding(
                   padding: const EdgeInsets.all(16.0),
@@ -137,354 +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

@@ -1,8 +1,15 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
-import '../providers/supplement_provider.dart';
-import '../providers/settings_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 '../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';
@@ -17,6 +24,31 @@ class SupplementsListScreen extends StatelessWidget {
         title: const Text('My Supplements'),
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
         actions: [
+          Consumer<SimpleSyncProvider>(
+            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 == SyncStatus.completed &&
+                      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.syncDatabase();
+                },
+                tooltip: syncProvider.isSyncing ? 'Syncing...' : 'Force Sync',
+              );
+            },
+          ),
           IconButton(
             icon: const Icon(Icons.archive),
             onPressed: () {
@@ -79,76 +111,232 @@ 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) => 
+          ...groupedSupplements['morning']!.map((supplement) =>
             SupplementCard(
               supplement: supplement,
               onTake: () => _showTakeDialog(context, supplement),
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
         ],
-        
+
         if (groupedSupplements['afternoon']!.isNotEmpty) ...[
           _buildSectionHeader('Afternoon (${settingsProvider.afternoonRange})', Icons.light_mode, Colors.blue, groupedSupplements['afternoon']!.length),
-          ...groupedSupplements['afternoon']!.map((supplement) => 
+          ...groupedSupplements['afternoon']!.map((supplement) =>
             SupplementCard(
               supplement: supplement,
               onTake: () => _showTakeDialog(context, supplement),
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
         ],
-        
+
         if (groupedSupplements['evening']!.isNotEmpty) ...[
           _buildSectionHeader('Evening (${settingsProvider.eveningRange})', Icons.nightlight_round, Colors.indigo, groupedSupplements['evening']!.length),
-          ...groupedSupplements['evening']!.map((supplement) => 
+          ...groupedSupplements['evening']!.map((supplement) =>
             SupplementCard(
               supplement: supplement,
               onTake: () => _showTakeDialog(context, supplement),
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
         ],
-        
+
         if (groupedSupplements['night']!.isNotEmpty) ...[
           _buildSectionHeader('Night (${settingsProvider.nightRange})', Icons.bedtime, Colors.purple, groupedSupplements['night']!.length),
-          ...groupedSupplements['night']!.map((supplement) => 
+          ...groupedSupplements['night']!.map((supplement) =>
             SupplementCard(
               supplement: supplement,
               onTake: () => _showTakeDialog(context, supplement),
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
         ],
-        
+
         if (groupedSupplements['anytime']!.isNotEmpty) ...[
           _buildSectionHeader('Anytime', Icons.schedule, Colors.grey, groupedSupplements['anytime']!.length),
-          ...groupedSupplements['anytime']!.map((supplement) => 
+          ...groupedSupplements['anytime']!.map((supplement) =>
             SupplementCard(
               supplement: supplement,
               onTake: () => _showTakeDialog(context, supplement),
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
         ],
@@ -245,6 +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();
@@ -305,7 +735,7 @@ class SupplementsListScreen extends StatelessWidget {
                   ),
                 ),
                 const SizedBox(height: 16),
-                
+
                 // Time selection section
                 Container(
                   padding: const EdgeInsets.all(12),

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

@@ -1,18 +1,22 @@
-import 'package:sqflite/sqflite.dart';
-import 'package:sqflite_common_ffi/sqflite_ffi.dart';
-import 'package:path/path.dart';
-import 'dart:io';
 import 'dart:convert';
+import 'dart:io';
+
+import 'package:path/path.dart';
+import 'package:sqflite_common_ffi/sqflite_ffi.dart';
+
 import '../models/supplement.dart';
 import '../models/supplement_intake.dart';
+import 'database_sync_service.dart';
 
 class DatabaseHelper {
   static const _databaseName = 'supplements.db';
-  static const _databaseVersion = 5; // Increment version for notification tracking
+  static const _databaseVersion = 6; // Increment version for sync support
 
   static const supplementsTable = 'supplements';
   static const intakesTable = 'supplement_intakes';
   static const notificationTrackingTable = 'notification_tracking';
+  static const syncMetadataTable = 'sync_metadata';
+  static const deviceInfoTable = 'device_info';
 
   DatabaseHelper._privateConstructor();
   static final DatabaseHelper instance = DatabaseHelper._privateConstructor();
@@ -60,7 +64,11 @@ class DatabaseHelper {
         reminderTimes TEXT NOT NULL,
         notes TEXT,
         createdAt TEXT NOT NULL,
-        isActive INTEGER NOT NULL DEFAULT 1
+        isActive INTEGER NOT NULL DEFAULT 1,
+        syncId TEXT NOT NULL UNIQUE,
+        lastModified TEXT NOT NULL,
+        syncStatus TEXT NOT NULL DEFAULT 'pending',
+        isDeleted INTEGER NOT NULL DEFAULT 0
       )
     ''');
 
@@ -72,6 +80,10 @@ class DatabaseHelper {
         dosageTaken REAL NOT NULL,
         unitsTaken REAL NOT NULL DEFAULT 1,
         notes TEXT,
+        syncId TEXT NOT NULL UNIQUE,
+        lastModified TEXT NOT NULL,
+        syncStatus TEXT NOT NULL DEFAULT 'pending',
+        isDeleted INTEGER NOT NULL DEFAULT 0,
         FOREIGN KEY (supplementId) REFERENCES $supplementsTable (id)
       )
     ''');
@@ -89,6 +101,27 @@ class DatabaseHelper {
         FOREIGN KEY (supplementId) REFERENCES $supplementsTable (id)
       )
     ''');
+
+    // Sync metadata table for tracking sync operations
+    await db.execute('''
+      CREATE TABLE $syncMetadataTable (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        key TEXT NOT NULL UNIQUE,
+        value TEXT NOT NULL,
+        lastUpdated TEXT NOT NULL
+      )
+    ''');
+
+    // Device info table for conflict resolution
+    await db.execute('''
+      CREATE TABLE $deviceInfoTable (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        deviceId TEXT NOT NULL UNIQUE,
+        deviceName TEXT NOT NULL,
+        lastSyncTime TEXT,
+        createdAt TEXT NOT NULL
+      )
+    ''');
   }
 
   Future<void> _onUpgrade(Database db, int oldVersion, int newVersion) async {
@@ -98,16 +131,16 @@ class DatabaseHelper {
       await db.execute('ALTER TABLE $supplementsTable ADD COLUMN numberOfUnits INTEGER DEFAULT 1');
       await db.execute('ALTER TABLE $supplementsTable ADD COLUMN unitType TEXT DEFAULT "units"');
       await db.execute('ALTER TABLE $intakesTable ADD COLUMN unitsTaken REAL DEFAULT 1');
-      
+
       // Migrate existing data from old dosage column to new dosageAmount column
       await db.execute('''
-        UPDATE $supplementsTable 
-        SET dosageAmount = COALESCE(dosage, 0), 
+        UPDATE $supplementsTable
+        SET dosageAmount = COALESCE(dosage, 0),
             numberOfUnits = 1,
             unitType = 'units'
         WHERE dosageAmount = 0
       ''');
-      
+
       // Create new table with correct schema
       await db.execute('''
         CREATE TABLE ${supplementsTable}_new (
@@ -125,37 +158,37 @@ class DatabaseHelper {
           isActive INTEGER NOT NULL DEFAULT 1
         )
       ''');
-      
+
       // Copy data to new table
       await db.execute('''
-        INSERT INTO ${supplementsTable}_new 
+        INSERT INTO ${supplementsTable}_new
         (id, name, brand, dosageAmount, numberOfUnits, unit, unitType, frequencyPerDay, reminderTimes, notes, createdAt, isActive)
         SELECT id, name, NULL as brand, dosageAmount, numberOfUnits, unit, unitType, frequencyPerDay, reminderTimes, notes, createdAt, isActive
         FROM $supplementsTable
       ''');
-      
+
       // Drop old table and rename new table
       await db.execute('DROP TABLE $supplementsTable');
       await db.execute('ALTER TABLE ${supplementsTable}_new RENAME TO $supplementsTable');
     }
-    
+
     if (oldVersion < 3) {
       // Add brand column for version 3
       await db.execute('ALTER TABLE $supplementsTable ADD COLUMN brand TEXT');
     }
-    
+
     if (oldVersion < 4) {
       // Complete migration to new ingredient-based schema
       // Add ingredients column and migrate old data
       await db.execute('ALTER TABLE $supplementsTable ADD COLUMN ingredients TEXT DEFAULT "[]"');
-      
+
       // Migrate existing supplements to use ingredients format
       final supplements = await db.query(supplementsTable);
       for (final supplement in supplements) {
         final dosageAmount = supplement['dosageAmount'] as double?;
         final unit = supplement['unit'] as String?;
         final name = supplement['name'] as String;
-        
+
         if (dosageAmount != null && unit != null && dosageAmount > 0) {
           // Create a single ingredient from the old dosage data
           final ingredient = {
@@ -164,7 +197,7 @@ class DatabaseHelper {
             'unit': unit,
           };
           final ingredientsJson = jsonEncode([ingredient]);
-          
+
           await db.update(
             supplementsTable,
             {'ingredients': ingredientsJson},
@@ -173,7 +206,7 @@ class DatabaseHelper {
           );
         }
       }
-      
+
       // Remove old columns
       await db.execute('''
         CREATE TABLE ${supplementsTable}_new (
@@ -190,18 +223,18 @@ class DatabaseHelper {
           isActive INTEGER NOT NULL DEFAULT 1
         )
       ''');
-      
+
       await db.execute('''
-        INSERT INTO ${supplementsTable}_new 
+        INSERT INTO ${supplementsTable}_new
         (id, name, brand, ingredients, numberOfUnits, unitType, frequencyPerDay, reminderTimes, notes, createdAt, isActive)
         SELECT id, name, brand, ingredients, numberOfUnits, unitType, frequencyPerDay, reminderTimes, notes, createdAt, isActive
         FROM $supplementsTable
       ''');
-      
+
       await db.execute('DROP TABLE $supplementsTable');
       await db.execute('ALTER TABLE ${supplementsTable}_new RENAME TO $supplementsTable');
     }
-    
+
     if (oldVersion < 5) {
       // Add notification tracking table
       await db.execute('''
@@ -218,6 +251,77 @@ class DatabaseHelper {
         )
       ''');
     }
+
+    if (oldVersion < 6) {
+      // Add sync columns to existing tables
+      await db.execute('ALTER TABLE $supplementsTable ADD COLUMN syncId TEXT');
+      await db.execute('ALTER TABLE $supplementsTable ADD COLUMN lastModified TEXT');
+      await db.execute('ALTER TABLE $supplementsTable ADD COLUMN syncStatus TEXT DEFAULT "pending"');
+      await db.execute('ALTER TABLE $supplementsTable ADD COLUMN isDeleted INTEGER DEFAULT 0');
+
+      await db.execute('ALTER TABLE $intakesTable ADD COLUMN syncId TEXT');
+      await db.execute('ALTER TABLE $intakesTable ADD COLUMN lastModified TEXT');
+      await db.execute('ALTER TABLE $intakesTable ADD COLUMN syncStatus TEXT DEFAULT "pending"');
+      await db.execute('ALTER TABLE $intakesTable ADD COLUMN isDeleted INTEGER DEFAULT 0');
+
+      // Generate sync IDs and timestamps for existing records
+      final supplements = await db.query(supplementsTable);
+      for (final supplement in supplements) {
+        if (supplement['syncId'] == null) {
+          final now = DateTime.now().toIso8601String();
+          await db.update(
+            supplementsTable,
+            {
+              'syncId': 'sync-${supplement['id']}-${DateTime.now().millisecondsSinceEpoch}',
+              'lastModified': now,
+              'syncStatus': 'pending',
+              'isDeleted': 0,
+            },
+            where: 'id = ?',
+            whereArgs: [supplement['id']],
+          );
+        }
+      }
+
+      final intakes = await db.query(intakesTable);
+      for (final intake in intakes) {
+        if (intake['syncId'] == null) {
+          final now = DateTime.now().toIso8601String();
+          await db.update(
+            intakesTable,
+            {
+              'syncId': 'sync-${intake['id']}-${DateTime.now().millisecondsSinceEpoch}',
+              'lastModified': now,
+              'syncStatus': 'pending',
+              'isDeleted': 0,
+            },
+            where: 'id = ?',
+            whereArgs: [intake['id']],
+          );
+        }
+      }
+
+      // Create sync metadata table
+      await db.execute('''
+        CREATE TABLE $syncMetadataTable (
+          id INTEGER PRIMARY KEY AUTOINCREMENT,
+          key TEXT NOT NULL UNIQUE,
+          value TEXT NOT NULL,
+          lastUpdated TEXT NOT NULL
+        )
+      ''');
+
+      // Create device info table
+      await db.execute('''
+        CREATE TABLE $deviceInfoTable (
+          id INTEGER PRIMARY KEY AUTOINCREMENT,
+          deviceId TEXT NOT NULL UNIQUE,
+          deviceName TEXT NOT NULL,
+          lastSyncTime TEXT,
+          createdAt TEXT NOT NULL
+        )
+      ''');
+    }
   }
 
   // Supplement CRUD operations
@@ -230,8 +334,8 @@ class DatabaseHelper {
     Database db = await database;
     List<Map<String, dynamic>> maps = await db.query(
       supplementsTable,
-      where: 'isActive = ?',
-      whereArgs: [1],
+      where: 'isActive = ? AND isDeleted = ?',
+      whereArgs: [1, 0],
       orderBy: 'name ASC',
     );
     return List.generate(maps.length, (i) => Supplement.fromMap(maps[i]));
@@ -241,8 +345,8 @@ class DatabaseHelper {
     Database db = await database;
     List<Map<String, dynamic>> maps = await db.query(
       supplementsTable,
-      where: 'isActive = ?',
-      whereArgs: [0],
+      where: 'isActive = ? AND isDeleted = ?',
+      whereArgs: [0, 0],
       orderBy: 'name ASC',
     );
     return List.generate(maps.length, (i) => Supplement.fromMap(maps[i]));
@@ -295,7 +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],
     );
@@ -307,15 +447,45 @@ 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();
     String endDate = DateTime(date.year, date.month, date.day, 23, 59, 59).toIso8601String();
-    
+
     List<Map<String, dynamic>> maps = await db.query(
       intakesTable,
-      where: 'takenAt >= ? AND takenAt <= ?',
-      whereArgs: [startDate, endDate],
+      where: 'takenAt >= ? AND takenAt <= ? AND isDeleted = ?',
+      whereArgs: [startDate, endDate, 0],
       orderBy: 'takenAt DESC',
     );
     return List.generate(maps.length, (i) => SupplementIntake.fromMap(maps[i]));
@@ -325,11 +495,11 @@ class DatabaseHelper {
     Database db = await database;
     String startDate = DateTime(year, month, 1).toIso8601String();
     String endDate = DateTime(year, month + 1, 0, 23, 59, 59).toIso8601String();
-    
+
     List<Map<String, dynamic>> maps = await db.query(
       intakesTable,
-      where: 'takenAt >= ? AND takenAt <= ?',
-      whereArgs: [startDate, endDate],
+      where: 'takenAt >= ? AND takenAt <= ? AND isDeleted = ?',
+      whereArgs: [startDate, endDate, 0],
       orderBy: 'takenAt DESC',
     );
     return List.generate(maps.length, (i) => SupplementIntake.fromMap(maps[i]));
@@ -339,18 +509,18 @@ class DatabaseHelper {
     Database db = await database;
     String startDate = DateTime(date.year, date.month, date.day).toIso8601String();
     String endDate = DateTime(date.year, date.month, date.day, 23, 59, 59).toIso8601String();
-    
+
     List<Map<String, dynamic>> result = await db.rawQuery('''
-      SELECT i.*, 
+      SELECT i.*,
              i.supplementId as supplement_id,
-             s.name as supplementName, 
+             s.name as supplementName,
              s.unitType as supplementUnitType
       FROM $intakesTable i
       JOIN $supplementsTable s ON i.supplementId = s.id
-      WHERE i.takenAt >= ? AND i.takenAt <= ?
+      WHERE i.takenAt >= ? AND i.takenAt <= ? AND i.isDeleted = ?
       ORDER BY i.takenAt DESC
-    ''', [startDate, endDate]);
-    
+    ''', [startDate, endDate, 0]);
+
     return result;
   }
 
@@ -358,28 +528,19 @@ class DatabaseHelper {
     Database db = await database;
     String startDate = DateTime(year, month, 1).toIso8601String();
     String endDate = DateTime(year, month + 1, 0, 23, 59, 59).toIso8601String();
-    
+
     List<Map<String, dynamic>> result = await db.rawQuery('''
-      SELECT i.*, 
+      SELECT i.*,
              i.supplementId as supplement_id,
-             s.name as supplementName, 
+             s.name as supplementName,
              s.unitType as supplementUnitType
       FROM $intakesTable i
       JOIN $supplementsTable s ON i.supplementId = s.id
-      WHERE i.takenAt >= ? AND i.takenAt <= ?
+      WHERE i.takenAt >= ? AND i.takenAt <= ? AND i.isDeleted = ?
       ORDER BY i.takenAt DESC
-    ''', [startDate, endDate]);
-    
-    return result;
-  }
+    ''', [startDate, endDate, 0]);
 
-  Future<int> deleteIntake(int id) async {
-    Database db = await database;
-    return await db.delete(
-      intakesTable,
-      where: 'id = ?',
-      whereArgs: [id],
-    );
+    return result;
   }
 
   // Notification tracking methods
@@ -389,11 +550,11 @@ class DatabaseHelper {
     required DateTime scheduledTime,
   }) async {
     Database db = await database;
-    
+
     // Use INSERT OR REPLACE to handle both new and existing notifications
     await db.rawInsert('''
-      INSERT OR REPLACE INTO $notificationTrackingTable 
-      (notificationId, supplementId, scheduledTime, status, retryCount, lastRetryTime, createdAt) 
+      INSERT OR REPLACE INTO $notificationTrackingTable
+      (notificationId, supplementId, scheduledTime, status, retryCount, lastRetryTime, createdAt)
       VALUES (?, ?, ?, ?, ?, ?, ?)
     ''', [
       notificationId,
@@ -404,7 +565,7 @@ class DatabaseHelper {
       null,
       DateTime.now().toIso8601String(),
     ]);
-    
+
     return notificationId;
   }
 
@@ -421,8 +582,8 @@ class DatabaseHelper {
   Future<void> incrementRetryCount(int notificationId) async {
     Database db = await database;
     await db.rawUpdate('''
-      UPDATE $notificationTrackingTable 
-      SET retryCount = retryCount + 1, 
+      UPDATE $notificationTrackingTable
+      SET retryCount = retryCount + 1,
           lastRetryTime = ?,
           status = 'retrying'
       WHERE notificationId = ?
@@ -469,4 +630,130 @@ class DatabaseHelper {
       whereArgs: [supplementId],
     );
   }
+
+  // Sync metadata operations
+  Future<void> setSyncMetadata(String key, String value) async {
+    Database db = await database;
+    await db.rawInsert('''
+      INSERT OR REPLACE INTO $syncMetadataTable (key, value, lastUpdated)
+      VALUES (?, ?, ?)
+    ''', [key, value, DateTime.now().toIso8601String()]);
+  }
+
+  Future<String?> getSyncMetadata(String key) async {
+    Database db = await database;
+    List<Map<String, dynamic>> result = await db.query(
+      syncMetadataTable,
+      where: 'key = ?',
+      whereArgs: [key],
+    );
+    return result.isNotEmpty ? result.first['value'] : null;
+  }
+
+  Future<void> deleteSyncMetadata(String key) async {
+    Database db = await database;
+    await db.delete(
+      syncMetadataTable,
+      where: 'key = ?',
+      whereArgs: [key],
+    );
+  }
+
+  // Device info operations
+  Future<void> setDeviceInfo(String deviceId, String deviceName) async {
+    Database db = await database;
+    await db.rawInsert('''
+      INSERT OR REPLACE INTO $deviceInfoTable (deviceId, deviceName, lastSyncTime, createdAt)
+      VALUES (?, ?, ?, ?)
+    ''', [deviceId, deviceName, null, DateTime.now().toIso8601String()]);
+  }
+
+  Future<void> updateLastSyncTime(String deviceId) async {
+    Database db = await database;
+    await db.update(
+      deviceInfoTable,
+      {'lastSyncTime': DateTime.now().toIso8601String()},
+      where: 'deviceId = ?',
+      whereArgs: [deviceId],
+    );
+  }
+
+  Future<Map<String, dynamic>?> getDeviceInfo(String deviceId) async {
+    Database db = await database;
+    List<Map<String, dynamic>> result = await db.query(
+      deviceInfoTable,
+      where: 'deviceId = ?',
+      whereArgs: [deviceId],
+    );
+    return result.isNotEmpty ? result.first : null;
+  }
+
+  // Sync-specific queries
+  Future<List<Supplement>> getModifiedSupplements() async {
+    Database db = await database;
+    List<Map<String, dynamic>> maps = await db.query(
+      supplementsTable,
+      where: 'syncStatus IN (?, ?)',
+      whereArgs: [RecordSyncStatus.pending.name, RecordSyncStatus.modified.name],
+      orderBy: 'lastModified ASC',
+    );
+    return List.generate(maps.length, (i) => Supplement.fromMap(maps[i]));
+  }
+
+  Future<List<SupplementIntake>> getModifiedIntakes() async {
+    Database db = await database;
+    List<Map<String, dynamic>> maps = await db.query(
+      intakesTable,
+      where: 'syncStatus IN (?, ?)',
+      whereArgs: [RecordSyncStatus.pending.name, RecordSyncStatus.modified.name],
+      orderBy: 'lastModified ASC',
+    );
+    return List.generate(maps.length, (i) => SupplementIntake.fromMap(maps[i]));
+  }
+
+  Future<void> markSupplementAsSynced(String syncId) async {
+    Database db = await database;
+    await db.update(
+      supplementsTable,
+      {'syncStatus': RecordSyncStatus.synced.name},
+      where: 'syncId = ?',
+      whereArgs: [syncId],
+    );
+  }
+
+  Future<void> markIntakeAsSynced(String syncId) async {
+    Database db = await database;
+    await db.update(
+      intakesTable,
+      {'syncStatus': RecordSyncStatus.synced.name},
+      where: 'syncId = ?',
+      whereArgs: [syncId],
+    );
+  }
+
+  Future<Supplement?> getSupplementBySyncId(String syncId) async {
+    Database db = await database;
+    List<Map<String, dynamic>> maps = await db.query(
+      supplementsTable,
+      where: 'syncId = ?',
+      whereArgs: [syncId],
+    );
+    if (maps.isNotEmpty) {
+      return Supplement.fromMap(maps.first);
+    }
+    return null;
+  }
+
+  Future<SupplementIntake?> getIntakeBySyncId(String syncId) async {
+    Database db = await database;
+    List<Map<String, dynamic>> maps = await db.query(
+      intakesTable,
+      where: 'syncId = ?',
+      whereArgs: [syncId],
+    );
+    if (maps.isNotEmpty) {
+      return SupplementIntake.fromMap(maps.first);
+    }
+    return null;
+  }
 }

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('📱 Action ID: ${notificationResponse.actionId}');
-  print('📱 Payload: ${notificationResponse.payload}');
-  print('📱 Notification ID: ${notificationResponse.id}');
-  print('📱 ==========================================');
-  
+  print('SupplementsLog: 📱 === BACKGROUND NOTIFICATION RESPONSE ===');
+  print('SupplementsLog: 📱 Action ID: ${notificationResponse.actionId}');
+  print('SupplementsLog: 📱 Payload: ${notificationResponse.payload}');
+  print('SupplementsLog: 📱 Notification ID: ${notificationResponse.id}');
+  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');
   }
 }
 
@@ -30,7 +30,7 @@ class NotificationService {
   bool _isInitialized = false;
   static bool _engineInitialized = false;
   bool _permissionsRequested = false;
-  
+
   // Callback for handling supplement intake from notifications
   Function(int supplementId, String supplementName, double units, String unitType)? _onTakeSupplementCallback;
 
@@ -40,36 +40,36 @@ 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('📱 Engine initialized flag: $_engineInitialized');
-      
+      print('SupplementsLog: 📱 Initializing timezones...');
+      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
     }
-    
+
     // Try to detect and set the local timezone more reliably
     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;
-      
+
       // Try common timezone mappings for your region
       if (timeZoneName.contains('CET') || timeZoneName.contains('CEST')) {
         location = tz.getLocation('Europe/Amsterdam'); // Netherlands
@@ -80,23 +80,23 @@ 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('📱 Current system time: ${DateTime.now()}');
-    
+
+    print('SupplementsLog: 📱 Current local time: ${tz.TZDateTime.now(tz.local)}');
+    print('SupplementsLog: 📱 Current system time: ${DateTime.now()}');
+
     const AndroidInitializationSettings androidSettings = AndroidInitializationSettings('@mipmap/ic_launcher');
     const DarwinInitializationSettings iosSettings = DarwinInitializationSettings(
       requestAlertPermission: false, // We'll request these separately
@@ -113,97 +113,113 @@ class NotificationService {
       linux: linuxSettings,
     );
 
-    print('📱 Initializing flutter_local_notifications...');
+    print('SupplementsLog: 📱 Initializing flutter_local_notifications...');
     await _notifications.initialize(
       initSettings,
       onDidReceiveNotificationResponse: _onNotificationResponse,
       onDidReceiveBackgroundNotificationResponse: notificationTapBackground,
     );
-    
+
     // 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('📱 Action ID: ${response.actionId}');
-    print('📱 Payload: ${response.payload}');
-    print('📱 Notification ID: ${response.id}');
-    print('📱 Input: ${response.input}');
-    print('📱 ===============================');
-    
+    print('SupplementsLog: 📱 === NOTIFICATION RESPONSE ===');
+    print('SupplementsLog: 📱 Action ID: ${response.actionId}');
+    print('SupplementsLog: 📱 Payload: ${response.payload}');
+    print('SupplementsLog: 📱 Notification ID: ${response.id}');
+    print('SupplementsLog: 📱 Input: ${response.input}');
+    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('📱 Payload received: $payload');
-    
+    print('SupplementsLog: 📱 === HANDLING TAKE ACTION ===');
+    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]);
           final supplementName = parts[1];
           final units = double.parse(parts[2]);
           final unitType = parts[3];
-          
-          print('📱 Parsed data:');
-          print('📱   - ID: $supplementId');
-          print('📱   - Name: $supplementName');
-          print('📱   - Units: $units');
-          print('📱   - Type: $unitType');
-          
+
+          print('SupplementsLog: 📱 Parsed data:');
+          print('SupplementsLog: 📱   - ID: $supplementId');
+          print('SupplementsLog: 📱   - Name: $supplementName');
+          print('SupplementsLog: 📱   - Units: $units');
+          print('SupplementsLog: 📱   - Type: $unitType');
+
           // Call the callback to record the intake
           if (_onTakeSupplementCallback != null) {
-            print('📱 Calling supplement callback...');
-            _onTakeSupplementCallback!(supplementId, supplementName, units, unitType);
-            print('📱 Callback completed');
+            print('SupplementsLog: 📱 Calling supplement callback...');
+            _onTakeSupplementCallback!(
+                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('📱 Marking notification $notificationId as taken');
-            await DatabaseHelper.instance.markNotificationTaken(notificationId);
-            
-            // Cancel any pending retry notifications for this notification
-            _cancelRetryNotifications(notificationId);
-          }
-          
+          print(
+              'SupplementsLog: 📱 Marking notification $originalNotificationId as taken');
+          await DatabaseHelper.instance
+              .markNotificationTaken(originalNotificationId);
+
+          // Cancel any pending retry notifications for this notification
+          _cancelRetryNotifications(originalNotificationId);
+
           // Show a confirmation notification
-          print('📱 Showing confirmation notification...');
+          print('SupplementsLog: 📱 Showing confirmation notification...');
           showInstantNotification(
             'Supplement Taken!',
             '$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) {
@@ -211,33 +227,33 @@ 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('📱 Payload: $payload, Minutes: $minutes');
-    
+    print('SupplementsLog: 📱 === HANDLING SNOOZE ACTION ===');
+    print('SupplementsLog: 📱 Payload: $payload, Minutes: $minutes');
+
     if (payload != null) {
       try {
         final parts = payload.split('|');
         if (parts.length >= 2) {
           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
             'Reminder: $supplementName',
@@ -266,18 +282,18 @@ class NotificationService {
             androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
             payload: payload,
           );
-          
+
           showInstantNotification(
             'Reminder Snoozed',
             '$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
@@ -299,65 +315,65 @@ 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();
-      
+
       for (final notification in pendingNotifications) {
         final scheduledTime = DateTime.parse(notification['scheduledTime']).toLocal();
         final retryCount = notification['retryCount'] as int;
-        final lastRetryTime = notification['lastRetryTime'] != null 
+        final lastRetryTime = notification['lastRetryTime'] != null
             ? DateTime.parse(notification['lastRetryTime']).toLocal()
             : null;
-        
+
         // Check if notification is overdue
         final timeSinceScheduled = now.difference(scheduledTime).inMinutes;
         final shouldRetry = timeSinceScheduled >= reminderRetryInterval;
-        
-        print('📱 Checking notification ${notification['notificationId']}:');
-        print('📱   Scheduled: $scheduledTime (local)');
-        print('📱   Now: $now');
-        print('📱   Time since scheduled: $timeSinceScheduled minutes');
-        print('📱   Retry interval: $reminderRetryInterval minutes');
-        print('📱   Should retry: $shouldRetry');
-        print('📱   Retry count: $retryCount / $maxRetryAttempts');
-        
+
+        print('SupplementsLog: 📱 Checking notification ${notification['notificationId']}:');
+        print('SupplementsLog: 📱   Scheduled: $scheduledTime (local)');
+        print('SupplementsLog: 📱   Now: $now');
+        print('SupplementsLog: 📱   Time since scheduled: $timeSinceScheduled minutes');
+        print('SupplementsLog: 📱   Retry interval: $reminderRetryInterval minutes');
+        print('SupplementsLog: 📱   Should retry: $shouldRetry');
+        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;
         }
-        
+
         // Check if enough time has passed since last retry
         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');
     }
   }
 
@@ -365,16 +381,16 @@ class NotificationService {
     try {
       final notificationId = notification['notificationId'] as int;
       final supplementId = notification['supplementId'] as int;
-      
+
       // 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 $retryAttempt)');
+
       // Get supplement details from database
       final supplements = await DatabaseHelper.instance.getAllSupplements();
       final supplement = supplements.firstWhere((s) => s.id == supplementId && s.isActive, orElse: () => throw Exception('Supplement not found'));
-      
+
       // Schedule the retry notification immediately
       await _notifications.show(
         retryNotificationId,
@@ -404,65 +420,65 @@ class NotificationService {
         ),
         payload: '${supplement.id}|${supplement.name}|${supplement.numberOfUnits}|${supplement.unitType}|$notificationId',
       );
-      
+
       // 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;
     }
-    
+
     try {
       _permissionsRequested = true;
-      
+
       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;
         }
       }
-      
+
       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('📱 Reminder times: ${supplement.reminderTimes}');
-    
+    print('SupplementsLog: 📱 Scheduling reminders for ${supplement.name}');
+    print('SupplementsLog: 📱 Reminder times: ${supplement.reminderTimes}');
+
     // Cancel existing notifications for this supplement
     await cancelSupplementReminders(supplement.id!);
 
@@ -474,8 +490,8 @@ 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(
@@ -505,7 +521,7 @@ class NotificationService {
               ),
               AndroidNotificationAction(
                 'snooze_10',
-                'Snooze 10min', 
+                'Snooze 10min',
                 icon: DrawableResourceAndroidBitmap('@android:drawable/ic_menu_recent_history'),
                 showsUserInterface: true, // Changed to true to open app
               ),
@@ -517,15 +533,15 @@ class NotificationService {
         matchDateTimeComponents: DateTimeComponents.time,
         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}');
     }
   }
 
@@ -535,7 +551,7 @@ class NotificationService {
       final notificationId = supplementId * 100 + i;
       await _notifications.cancel(notificationId);
     }
-    
+
     // Also clean up database tracking records for this supplement
     await DatabaseHelper.instance.clearNotificationTracking(supplementId);
   }
@@ -547,23 +563,23 @@ class NotificationService {
   tz.TZDateTime _nextInstanceOfTime(int hour, int minute) {
     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('📱 Target time: ${hour.toString().padLeft(2, '0')}:${minute.toString().padLeft(2, '0')}');
-    print('📱 Initial scheduled date: $scheduledDate (${scheduledDate.timeZoneName})');
-    
+
+    print('SupplementsLog: 📱 Current time: $now (${now.timeZoneName})');
+    print('SupplementsLog: 📱 Target time: ${hour.toString().padLeft(2, '0')}:${minute.toString().padLeft(2, '0')}');
+    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',
@@ -581,23 +597,23 @@ 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
       'Test Scheduled Notification',
@@ -615,8 +631,8 @@ class NotificationService {
       ),
       androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
     );
-    
-    print('📱 Test notification scheduled successfully');
+
+    print('SupplementsLog: 📱 Test notification scheduled successfully');
   }
 
   // Debug function to get all pending notifications
@@ -626,8 +642,8 @@ 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
       'Test Action Notification',
@@ -658,14 +674,14 @@ 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
       'Basic Test Notification',
@@ -682,7 +698,7 @@ 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/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
@@ -33,7 +35,7 @@ class _SupplementCardState extends State<SupplementCard> {
         final bool isTakenToday = provider.hasBeenTakenToday(widget.supplement.id!);
         final int todayIntakeCount = provider.getTodayIntakeCount(widget.supplement.id!);
         final bool isCompletelyTaken = todayIntakeCount >= widget.supplement.frequencyPerDay;
-        
+
         // Get today's intake times for this supplement
         final todayIntakes = provider.todayIntakes
             .where((intake) => intake['supplement_id'] == widget.supplement.id)
@@ -42,10 +44,10 @@ 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();
-        
+
         return Card(
           margin: const EdgeInsets.only(bottom: 16),
           elevation: 3,
@@ -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(
@@ -297,10 +324,10 @@ class _SupplementCardState extends State<SupplementCard> {
                             runSpacing: 4,
                             children: todayIntakes.map((intake) {
                               final units = intake['units'] as double;
-                              final unitsText = units == 1.0 
+                              final unitsText = units == 1.0
                                   ? '${widget.supplement.unitType}'
                                   : '${units.toStringAsFixed(units % 1 == 0 ? 0 : 1)} ${widget.supplement.unitType}';
-                              
+
                               return Container(
                                 padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
                                 decoration: BoxDecoration(
@@ -327,7 +354,7 @@ class _SupplementCardState extends State<SupplementCard> {
                     ),
                     const SizedBox(height: 16),
                   ],
-                  
+
                   // Ingredients section
                   Container(
                     padding: const EdgeInsets.all(12),
@@ -374,9 +401,9 @@ class _SupplementCardState extends State<SupplementCard> {
                       ],
                     ),
                   ),
-                  
+
                   const SizedBox(height: 12),
-                  
+
                   // Schedule and dosage info
                   Row(
                     children: [
@@ -397,7 +424,7 @@ class _SupplementCardState extends State<SupplementCard> {
                       ),
                     ],
                   ),
-                  
+
                   if (widget.supplement.reminderTimes.isNotEmpty) ...[
                     const SizedBox(height: 8),
                     _InfoChip(
@@ -407,7 +434,7 @@ class _SupplementCardState extends State<SupplementCard> {
                       fullWidth: true,
                     ),
                   ],
-                  
+
                   if (widget.supplement.notes != null && widget.supplement.notes!.isNotEmpty) ...[
                     const SizedBox(height: 8),
                     Container(
@@ -427,14 +454,14 @@ class _SupplementCardState extends State<SupplementCard> {
                       ),
                     ),
                   ],
-                  
+
                   const SizedBox(height: 16),
-                  
+
                   // Take button
                   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

@@ -6,6 +6,14 @@
 
 #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

@@ -3,6 +3,8 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  flutter_secure_storage_linux
+  url_launcher_linux
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -5,12 +5,20 @@
 import FlutterMacOS
 import Foundation
 
+import connectivity_plus
 import flutter_local_notifications
+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"))
   FlutterLocalNotificationsPlugin.register(with: registry.registrar(forPlugin: "FlutterLocalNotificationsPlugin"))
+  FlutterSecureStorageDarwinPlugin.register(with: registry.registrar(forPlugin: "FlutterSecureStorageDarwinPlugin"))
+  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

@@ -49,6 +49,38 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.19.1"
+  connectivity_plus:
+    dependency: "direct main"
+    description:
+      name: connectivity_plus
+      sha256: b5e72753cf63becce2c61fd04dfe0f1c430cc5278b53a1342dc5ad839eab29ec
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.5"
+  connectivity_plus_platform_interface:
+    dependency: transitive
+    description:
+      name: connectivity_plus_platform_interface
+      sha256: "42657c1715d48b167930d5f34d00222ac100475f73d10162ddf43e714932f204"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.1"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      sha256: b30acd5944035672bc15c6b7a8b47d773e41e2f17de064350988c5d02adb1c68
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
+  crypto:
+    dependency: "direct main"
+    description:
+      name: crypto
+      sha256: "1e445881f28f22d6140f181e07737b22f1e099a5e1ff94b0af2f9e4a463f4855"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.6"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -65,6 +97,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.7.11"
+  dio:
+    dependency: transitive
+    description:
+      name: dio
+      sha256: d90ee57923d1828ac14e492ca49440f65477f4bb1263575900be731a3dac66a9
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.9.0"
+  dio_web_adapter:
+    dependency: transitive
+    description:
+      name: dio_web_adapter
+      sha256: "7586e476d70caecaf1686d21eee7247ea43ef5c345eab9e0cc3583ff13378d78"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
   fake_async:
     dependency: transitive
     description:
@@ -89,6 +137,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "7.0.1"
+  fixnum:
+    dependency: transitive
+    description:
+      name: fixnum
+      sha256: b6dc7065e46c974bc7c5f143080a6764ec7a4be6da1285ececdc37be96de53be
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -134,6 +190,55 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.2"
+  flutter_secure_storage:
+    dependency: "direct main"
+    description:
+      name: flutter_secure_storage
+      sha256: f7eceb0bc6f4fd0441e29d43cab9ac2a1c5ffd7ea7b64075136b718c46954874
+      url: "https://pub.dev"
+    source: hosted
+    version: "10.0.0-beta.4"
+  flutter_secure_storage_darwin:
+    dependency: transitive
+    description:
+      name: flutter_secure_storage_darwin
+      sha256: f226f2a572bed96bc6542198ebaec227150786e34311d455a7e2d3d06d951845
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.0"
+  flutter_secure_storage_linux:
+    dependency: "direct overridden"
+    description:
+      path: flutter_secure_storage_linux
+      ref: patch-2
+      resolved-ref: f076cbb65b075afd6e3b648122987a67306dc298
+      url: "https://github.com/m-berto/flutter_secure_storage.git"
+    source: git
+    version: "2.0.1"
+  flutter_secure_storage_platform_interface:
+    dependency: "direct overridden"
+    description:
+      name: flutter_secure_storage_platform_interface
+      sha256: b8337d3d52e429e6c0a7710e38cf9742a3bb05844bd927450eb94f80c11ef85d
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0"
+  flutter_secure_storage_web:
+    dependency: transitive
+    description:
+      name: flutter_secure_storage_web
+      sha256: "4c3f233e739545c6cb09286eeec1cc4744138372b985113acc904f7263bef517"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0"
+  flutter_secure_storage_windows:
+    dependency: transitive
+    description:
+      name: flutter_secure_storage_windows
+      sha256: ff32af20f70a8d0e59b2938fc92de35b54a74671041c814275afd80e27df9f21
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.0"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -224,6 +329,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.16.0"
+  mime:
+    dependency: transitive
+    description:
+      name: mime
+      sha256: "41a20518f0cb1256669420fdba0cd90d21561e560ac240f26ef8322e45bb7ed6"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0"
   nested:
     dependency: transitive
     description:
@@ -232,6 +345,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
+  nm:
+    dependency: transitive
+    description:
+      name: nm
+      sha256: "2c9aae4127bdc8993206464fcc063611e0e36e72018696cd9631023a31b24254"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.5.0"
   path:
     dependency: "direct main"
     description:
@@ -240,6 +361,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.1"
+  path_provider:
+    dependency: transitive
+    description:
+      name: path_provider
+      sha256: "50c5dd5b6e1aaf6fb3a78b33f6aa3afca52bf903a8a5298f53101fdaee55bbcd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.5"
+  path_provider_android:
+    dependency: transitive
+    description:
+      name: path_provider_android
+      sha256: "993381400e94d18469750e5b9dcb8206f15bc09f9da86b9e44a9b0092a0066db"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.18"
+  path_provider_foundation:
+    dependency: transitive
+    description:
+      name: path_provider_foundation
+      sha256: "16eef174aacb07e09c351502740fa6254c165757638eba1e9116b0a781201bbd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.2"
   path_provider_linux:
     dependency: transitive
     description:
@@ -308,10 +453,10 @@ packages:
     dependency: transitive
     description:
       name: shared_preferences_android
-      sha256: "5bcf0772a761b04f8c6bf814721713de6f3e5d9d89caf8d3fe031b02a342379e"
+      sha256: a2608114b1ffdcbc9c120eb71a0e207c71da56202852d4aab8a5e30a82269e74
       url: "https://pub.dev"
     source: hosted
-    version: "2.4.11"
+    version: "2.4.12"
   shared_preferences_foundation:
     dependency: transitive
     description:
@@ -365,6 +510,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.10.1"
+  sprintf:
+    dependency: transitive
+    description:
+      name: sprintf
+      sha256: "1fc9ffe69d4df602376b52949af107d8f5703b77cda567c4d7d86a0693120f23"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.0"
   sqflite:
     dependency: "direct main"
     description:
@@ -485,6 +638,78 @@ 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:
+      name: uuid
+      sha256: a5be9ef6618a7ac1e964353ef476418026db906c4facdedaa299b7a2e71690ff
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.5.1"
   vector_math:
     dependency: transitive
     description:
@@ -509,6 +734,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.1.1"
+  webdav_client:
+    dependency: "direct main"
+    description:
+      name: webdav_client
+      sha256: "682fffc50b61dc0e8f46717171db03bf9caaa17347be41c0c91e297553bf86b2"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.2"
+  win32:
+    dependency: transitive
+    description:
+      name: win32
+      sha256: "66814138c3562338d05613a6e368ed8cfb237ad6d64a9e9334be3f309acfca03"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.14.0"
   xdg_directories:
     dependency: transitive
     description:
@@ -527,4 +768,4 @@ packages:
     version: "6.6.1"
 sdks:
   dart: ">=3.9.0 <4.0.0"
-  flutter: ">=3.27.0"
+  flutter: ">=3.29.0"

pubspec.yaml

@@ -1,107 +1,58 @@
 name: supplements
-description: "A new Flutter project."
-# The following line prevents the package from being accidentally published to
-# pub.dev using `flutter pub publish`. This is preferred for private packages.
-publish_to: 'none' # Remove this line if you wish to publish to pub.dev
-
-# The following defines the version and build number for your application.
-# A version number is three numbers separated by dots, like 1.2.43
-# followed by an optional build number separated by a +.
-# Both the version and the builder number may be overridden in flutter
-# build by specifying --build-name and --build-number, respectively.
-# In Android, build-name is used as versionName while build-number used as versionCode.
-# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
-# In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion.
-# Read more about iOS versioning at
-# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
-# In Windows, build-name is used as the major, minor, and patch parts
-# of the product and file versions while build-number is used as the build suffix.
-version: 1.0.0+1
+description: "A supplement tracking app for managing your daily supplements"
+publish_to: "none"
+version: 1.0.6+28082025
 
 environment:
   sdk: ^3.9.0
 
-# Dependencies specify other packages that your package needs in order to work.
-# To automatically upgrade your package dependencies to the latest versions
-# consider running `flutter pub upgrade --major-versions`. Alternatively,
-# dependencies can be manually updated by changing the version numbers below to
-# the latest version available on pub.dev. To see which dependencies have newer
-# versions available, run `flutter pub outdated`.
 dependencies:
   flutter:
     sdk: flutter
-
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.8
-  
+
   # Local database for storing supplements data
   sqflite: ^2.3.0
   sqflite_common_ffi: ^2.3.0
   path: ^1.8.3
-  
+
   # State management
   provider: ^6.1.1
-  
+
   # Settings persistence
   shared_preferences: ^2.2.2
-  
+
   # Local notifications
   flutter_local_notifications: ^19.4.1
   timezone: ^0.10.1
-  
+
   # Date time handling
   intl: ^0.20.2
 
+  # WebDAV sync functionality
+  webdav_client: ^1.2.2
+  connectivity_plus: ^6.1.5
+  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:
     sdk: flutter
 
-  # The "flutter_lints" package below contains a set of recommended lints to
-  # encourage good coding practices. The lint set provided by the package is
-  # activated in the `analysis_options.yaml` file located at the root of your
-  # package. See that file for information about deactivating specific lint
-  # rules and activating additional ones.
   flutter_lints: ^6.0.0
 
-# For information on the generic Dart part of this file, see the
-# following page: https://dart.dev/tools/pub/pubspec
+dependency_overrides:
+  flutter_secure_storage_linux:
+    git:
+      url: https://github.com/m-berto/flutter_secure_storage.git
+      ref: patch-2
+      path: flutter_secure_storage_linux
+  flutter_secure_storage_platform_interface: 2.0.0
 
-# The following section is specific to Flutter packages.
 flutter:
-
-  # The following line ensures that the Material Icons font is
-  # included with your application, so that you can use the icons in
-  # the material Icons class.
   uses-material-design: true
 
-  # To add assets to your application, add an assets section, like this:
-  # assets:
-  #   - images/a_dot_burr.jpeg
-  #   - images/a_dot_ham.jpeg
-
-  # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.dev/to/resolution-aware-images
-
-  # For details regarding adding assets from package dependencies, see
-  # https://flutter.dev/to/asset-from-package
-
-  # To add custom fonts to your application, add a fonts section here,
-  # in this "flutter" section. Each entry in this list should have a
-  # "family" key with the font family name, and a "fonts" key with a
-  # list giving the asset and other descriptors for the font. For
-  # example:
-  # fonts:
-  #   - family: Schyler
-  #     fonts:
-  #       - asset: fonts/Schyler-Regular.ttf
-  #       - asset: fonts/Schyler-Italic.ttf
-  #         style: italic
-  #   - family: Trajan Pro
-  #     fonts:
-  #       - asset: fonts/TrajanPro.ttf
-  #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
-  #
-  # For details regarding fonts from package dependencies,
-  # see https://flutter.dev/to/font-from-package
+  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

@@ -6,6 +6,15 @@
 
 #include "generated_plugin_registrant.h"
 
+#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

@@ -3,6 +3,9 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  connectivity_plus
+  flutter_secure_storage_windows
+  url_launcher_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST