Pack opening

SVSim.Database/Models/ViewerPackOpenCount.cs

@@ -0,0 +1,17 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace SVSim.Database.Models;
+
+/// <summary>
+/// Per-viewer, per-pack open counter. Owned collection on <see cref="Viewer"/>.
+/// <c>PackId</c> = parent_gacha_id. <c>LastDailyFreeAt</c> is null until the viewer first opens
+/// a DAILY (type_detail=3) child gacha; thereafter the controller compares it against the daily
+/// reset boundary to decide whether the free open is available again.
+/// </summary>
+[Owned]
+public class ViewerPackOpenCount
+{
+    public int PackId { get; set; }
+    public int OpenCount { get; set; }
+    public DateTime? LastDailyFreeAt { get; set; }
+}