Lots of data and model setup

SVSim.Database/Models/OwnedItemEntry.cs

@@ -0,0 +1,17 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace SVSim.Database.Models;
+
+[Owned]
+public class OwnedItemEntry
+{
+    public int Count { get; set; }
+
+    #region Navigation Properties
+
+    public ItemEntry Item { get; set; } = new ItemEntry();
+
+    public Viewer Viewer { get; set; } = new Viewer();
+
+    #endregion
+}