DTOs for index mostly done, doing DB models

SVSim.EmulatedEntrypoint/Models/Dtos/UserCard.cs

@@ -0,0 +1,22 @@
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos;
+
+/// <summary>
+/// A card in a user's collection and the number possessed.
+/// </summary>
+[MessagePackObject]
+public class UserCard : CardIdentifier
+{
+    /// <summary>
+    /// The number of the specified card the user has.
+    /// </summary>
+    [Key("number")]
+    public int Count { get; set; }
+    
+    /// <summary>
+    /// Whether the card is protected from dusting.
+    /// </summary>
+    [Key("is_protected")]
+    public int IsProtected { get; set; }
+}