init efcore

BlueLaminate/BlueLaminate.EFCore/Entities/InventoryItem.cs

@@ -0,0 +1,16 @@
+namespace BlueLaminate.EFCore.Entities;
+
+public class InventoryItem
+{
+    public int Id { get; set; }
+    public int UserId { get; set; }
+    public SteamUser User { get; set; } = null!;
+    public int SkinInstanceId { get; set; }
+    public SkinInstance SkinInstance { get; set; } = null!;
+
+    // Steam asset ID — changes on trade, not a stable identifier.
+    public string AssetId { get; set; } = null!;
+    public DateTimeOffset AcquiredAt { get; set; }
+
+    public ICollection<TradeItem> TradeItems { get; set; } = new List<TradeItem>();
+}