DTOs for index mostly done, doing DB models

DCGEngine.Database/Models/DeckCard.cs

@@ -0,0 +1,25 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace DCGEngine.Database.Models;
+
+/// <summary>
+/// A <see cref="CardEntry"/> that is in a <see cref="DeckEntry"/> X times.
+/// </summary>
+[Owned]
+public class DeckCard
+{
+    /// <summary>
+    /// The card in the deck.
+    /// </summary>
+    public virtual CardEntry Card { get; set; }
+    
+    /// <summary>
+    /// The number of the card that is in the deck.
+    /// </summary>
+    public virtual int Count { get; set; }
+    
+    /// <summary>
+    /// The deck this belongs to.
+    /// </summary>
+    public virtual DeckEntry Deck { get; set; }
+}