Initial commit

Groceries.Data/Items/Item.cs

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+namespace Groceries.Data;
+
+public class Item
+{
+    public Item(Guid id, string brand, string name)
+    {
+        Id = id;
+        Brand = brand;
+        Name = name;
+    }
+
+    public Item(Guid id) : this(id, default!, default!)
+    {
+    }
+
+    public Item(string brand, string name) : this(default, brand, name)
+    {
+    }
+
+    public Guid Id { get; init; }
+    public DateTime UpdatedAt { get; set; }
+    public string Brand { get; set; }
+    public string Name { get; set; }
+
+    public ICollection<ItemBarcode> Barcodes { get; init; } = new List<ItemBarcode>();
+    public IEnumerable<TransactionPromotion>? TransactionPromotions { get; init; }
+}

Groceries.Data/Items/ItemBarcode.cs

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+namespace Groceries.Data;
+
+public class ItemBarcode
+{
+    public ItemBarcode(Guid itemId, long barcodeData, string format)
+    {
+        ItemId = itemId;
+        BarcodeData = barcodeData;
+        Format = format;
+    }
+
+    public Guid ItemId { get; init; }
+    public long BarcodeData { get; init; }
+    public string Format { get; init; }
+}

Groceries.Data/Items/ItemPurchase.cs

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+namespace Groceries.Data;
+
+public class ItemPurchase
+{
+    public Guid ItemId { get; init; }
+    public Guid TransactionId { get; init; }
+    public DateTime CreatedAt { get; init; }
+    public Guid StoreId { get; init; }
+    public decimal Price { get; init; }
+    public int Quantity { get; init; }
+
+    public Item? Item { get; init; }
+    public Transaction? Transaction { get; init; }
+    public Store? Store { get; init; }
+}

Groceries.Data/Items/ItemTagQuantity.cs

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+namespace Groceries.Data;
+
+public class ItemTagQuantity
+{
+    public required string Tag { get; init; }
+    public required decimal Quantity { get; init; }
+    public string? Unit { get; init; }
+    public bool IsMetric { get; init; }
+    public bool IsDivisible { get; init; }
+}