Additional card content

SVSim.Database/DataSeeders/BaseDataSeeder.cs

@@ -117,6 +117,18 @@ public class BaseDataSeeder : IDataSeeder
         }
     }
 
+    private class CardCosmeticRewardMap : ClassMap<CardCosmeticReward>
+    {
+        public CardCosmeticRewardMap()
+        {
+            Map(m => m.CardId).Name("card_id");
+            Map(m => m.Type).Name("type");
+            Map(m => m.CosmeticId).Name("cosmetic_id");
+            Map(m => m.Quantity).Name("quantity").Default(1);
+            Map(m => m.Card).Ignore();
+        }
+    }
+
     public void Seed(ModelBuilder builder)
     {
         // Migrations bake the HasData rows into InsertData calls — once the migration is
@@ -146,6 +158,7 @@ public class BaseDataSeeder : IDataSeeder
         List<MyPageBackgroundEntry> myPageBackgrounds = ReadCsv<MyPageBackgroundEntry, MyPageBackgroundEntryMap>("mypagebackgrounds.csv");
         List<RankInfoEntry> rankinfos = ReadCsv<RankInfoEntry, RankInfoEntryMap>("ranks.csv");
         List<ClassExpEntry> classexp = ReadCsv<ClassExpEntry, ClassExpEntryMap>("classexp.csv");
+        List<CardCosmeticReward> cardCosmeticRewards = ReadCsv<CardCosmeticReward, CardCosmeticRewardMap>("card_cosmetic_rewards.csv");
 
         builder.Entity<ClassEntry>().HasData(classes);
         builder.Entity<LeaderSkinEntry>().HasData(leaderSkins);
@@ -156,5 +169,6 @@ public class BaseDataSeeder : IDataSeeder
         builder.Entity<MyPageBackgroundEntry>().HasData(myPageBackgrounds);
         builder.Entity<RankInfoEntry>().HasData(rankinfos);
         builder.Entity<ClassExpEntry>().HasData(classexp);
+        builder.Entity<CardCosmeticReward>().HasData(cardCosmeticRewards);
     }
 }

SVSim.Database/Enums/CosmeticType.cs

@@ -0,0 +1,15 @@
+namespace SVSim.Database.Enums;
+
+/// <summary>
+/// Subset of UserGoods.Type values that can be granted as a card-acquisition cosmetic.
+/// Numeric values MUST match Wizard/UserGoods.cs:8-22 so wire serialization
+/// (reward_type in /pack/open response) is direct passthrough.
+/// </summary>
+public enum CosmeticType
+{
+    Sleeve   = 6,
+    Emblem   = 7,
+    Degree   = 8,
+    Skin     = 10,
+    MyPageBG = 15,
+}

SVSim.Database/Models/CardCosmeticReward.cs

@@ -0,0 +1,24 @@
+using SVSim.Database.Enums;
+
+namespace SVSim.Database.Models;
+
+/// <summary>
+/// Association: when a viewer acquires <see cref="CardId"/>, they should also receive
+/// the cosmetic identified by (<see cref="Type"/>, <see cref="CosmeticId"/>) if they don't
+/// already own it.
+///
+/// Always recorded on the NON-FOIL row of a card. Foil twins (card_id + 1) inherit at
+/// lookup time — see CardAcquisitionService for the foil-resolution rule.
+///
+/// Composite PK on (CardId, Type, CosmeticId): naturally enforces "no duplicates" AND
+/// satisfies EF's deterministic-PK requirement for HasData seeding.
+/// </summary>
+public class CardCosmeticReward
+{
+    public long CardId { get; set; }
+    public CosmeticType Type { get; set; }
+    public long CosmeticId { get; set; }
+    public int Quantity { get; set; } = 1;
+
+    public ShadowverseCardEntry Card { get; set; } = null!;
+}

SVSim.Database/SVSimDbContext.cs

@@ -25,6 +25,7 @@ public class SVSimDbContext : DbContext
     public DbSet<ShadowverseCardEntry> Cards => Set<ShadowverseCardEntry>();
     public DbSet<ShadowverseCardSetEntry> CardSets => Set<ShadowverseCardSetEntry>();
     public DbSet<ShadowverseDeckEntry> Decks => Set<ShadowverseDeckEntry>();
+    public DbSet<CardCosmeticReward> CardCosmeticRewards => Set<CardCosmeticReward>();
 
     public DbSet<ClassEntry> Classes => Set<ClassEntry>();
     public DbSet<ClassExpEntry> ClassExpCurve => Set<ClassExpEntry>();
@@ -115,6 +116,18 @@ public class SVSimDbContext : DbContext
         modelBuilder.Entity<PackConfigEntry>().OwnsMany(p => p.Banners);
         modelBuilder.Entity<Viewer>().OwnsMany(v => v.PackOpenCounts);
 
+        modelBuilder.Entity<CardCosmeticReward>(b =>
+        {
+            b.HasKey(r => new { r.CardId, r.Type, r.CosmeticId });
+            b.HasIndex(r => r.CardId);
+            // No inverse nav on the Card side — avoid forcing CosmeticRewards to load on every
+            // Card query. See project_ef_split_query memory for the cartesian-explode risk.
+            b.HasOne(r => r.Card)
+                .WithMany()
+                .HasForeignKey(r => r.CardId)
+                .OnDelete(DeleteBehavior.Cascade);
+        });
+
         // GameConfiguration.Config: on Postgres use EF Core 8's OwnsOne+ToJson(jsonb column).
         // On SQLite (tests) ToJson's WriteJson has a known NullReferenceException when owned
         // collections are present — use a plain TEXT value converter instead so the same