Finished implementing xp shop. It allows users to buy frames and backgrounds if the user enables the feature in data/xp.yml. It can also be available only to patrons

src/NadekoBot/Db/Models/XpShopOwnedItem.cs

@@ -0,0 +1,17 @@
+using NadekoBot.Services.Database.Models;
+
+namespace NadekoBot.Db.Models;
+
+public class XpShopOwnedItem : DbEntity
+{
+    public ulong UserId { get; set; }
+    public XpShopItemType ItemType { get; set; }
+    public bool IsUsing { get; set; }
+    public string ItemKey { get; set; }
+}
+
+public enum XpShopItemType
+{
+    Background,
+    Frame,
+}