Deck fixes

SVSim.EmulatedEntrypoint/Controllers/AdminController.cs

@@ -1,3 +1,4 @@
+using System.Text.Json;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
@@ -5,6 +6,7 @@ using SVSim.Database;
 using SVSim.Database.Enums;
 using SVSim.Database.Models;
 using SVSim.Database.Repositories.Viewer;
+using SVSim.EmulatedEntrypoint.Infrastructure;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Admin;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Admin;
 
@@ -65,8 +67,10 @@ public class AdminController : SVSimController
         }
 
         // Reload with all the nav properties we need to mutate. RegisterViewer SaveChanges'd
-        // already, so we re-fetch with full graph and apply the updates.
+        // already, so we re-fetch with full graph and apply the updates. AsSplitQuery to avoid
+        // the cartesian-explosion across all the many-to-many cosmetic collections.
         var viewer = await _dbContext.Viewers
+            .AsSplitQuery()
             .Include(v => v.Info).ThenInclude(i => i.SelectedEmblem)
             .Include(v => v.Info).ThenInclude(i => i.SelectedDegree)
             .Include(v => v.Currency)
@@ -120,6 +124,18 @@ public class AdminController : SVSimController
             }
         }
 
+        // Clone the 8 starter decks into the viewer when freshly created — workaround for a
+        // client-side NRE in the deck-edit menu (DeckListUI.IsVisibleCreateNewButton at
+        // decompile Wizard/DeckListUI.cs:316 unconditionally reads `_deckGroup.DeckFormat`, but
+        // _deckGroup is null when GetCustomDeckGroup() finds no matching CustomDeck group in
+        // DeckGroupDataBase — which is exactly what happens for a fresh viewer). Prod players
+        // acquire decks via tutorial; we shortcut by seeding the 8 defaults at import time.
+        // See docs/audits/deck-edit-empty-decklist-nre-2026-05-23.md for the full background.
+        if (wasCreated)
+        {
+            await CloneDefaultDecksToViewerAsync(viewer);
+        }
+
         await _dbContext.SaveChangesAsync();
 
         return new ImportViewerResponse
@@ -144,4 +160,72 @@ public class AdminController : SVSimController
         var rows = await table.Where(e => ids.Contains(EF.Property<int>(e, "Id"))).ToListAsync();
         owned.AddRange(rows);
     }
+
+    /// <summary>
+    /// Default sleeve id used for cloned starter decks. Matches prod's wire shape — every
+    /// default_deck_list entry on /deck/info has <c>sleeve_id: 3000011</c>.
+    /// </summary>
+    private const long DefaultSleeveId = 3000011L;
+
+    /// <summary>
+    /// Formats we clone the starter decks into. Each format the player can open the deck-edit
+    /// menu for needs at least one CustomDeck group in <c>Data.DeckGroupDataBase</c>, otherwise
+    /// the client NREs on <c>_deckGroup.DeckFormat</c> in DeckListUI.IsVisibleCreateNewButton.
+    /// Rotation / Unlimited / MyRotation are the always-active base formats; PreRotation /
+    /// Crossover / Avatar are seasonal and gated by UI state — leave them empty for now (see
+    /// docs/audits/deck-edit-empty-decklist-nre-2026-05-23.md follow-ups).
+    /// </summary>
+    private static readonly Format[] SeededDeckFormats = { Format.Rotation, Format.Unlimited, Format.MyRotation };
+
+    /// <summary>
+    /// Materialize the 8 default decks into the viewer's deck collection, once per seeded format.
+    /// The tracked <paramref name="viewer"/> instance gets new ShadowverseDeckEntry rows added to
+    /// its Decks navigation; EF picks them up on the caller's SaveChangesAsync.
+    /// </summary>
+    private async Task CloneDefaultDecksToViewerAsync(Viewer viewer)
+    {
+        var defaultDecks = await _dbContext.DefaultDecks.AsNoTracking().OrderBy(d => d.Id).ToListAsync();
+        if (defaultDecks.Count == 0) return;
+
+        // Resolve nav-property entities once. Classes need LeaderSkins included for the
+        // DefaultLeaderSkin nav lookup. Cards are fetched in one bulk query keyed by id.
+        var classes = await _dbContext.Classes.Include(c => c.LeaderSkins).ToDictionaryAsync(c => c.Id);
+        var defaultSleeve = await _dbContext.Sleeves.FindAsync((int)DefaultSleeveId);
+
+        var allCardIds = defaultDecks
+            .SelectMany(d => JsonSerializer.Deserialize<List<long>>(d.CardIdArray, JsonbReadOptions.Instance) ?? new List<long>())
+            .Distinct()
+            .ToList();
+        var cards = await _dbContext.Cards.Where(c => allCardIds.Contains(c.Id)).ToDictionaryAsync(c => c.Id);
+
+        foreach (var format in SeededDeckFormats)
+        {
+            int slot = 1;
+            foreach (var d in defaultDecks)
+            {
+                if (!classes.TryGetValue(d.ClassId, out var classEntry)) continue;
+                var leaderSkin = classEntry.DefaultLeaderSkin ?? classEntry.LeaderSkins.FirstOrDefault();
+                if (leaderSkin is null || defaultSleeve is null) continue;
+
+                var cardIdArray = JsonSerializer.Deserialize<List<long>>(d.CardIdArray, JsonbReadOptions.Instance) ?? new List<long>();
+                var deckCards = cardIdArray
+                    .GroupBy(id => id)
+                    .Where(g => cards.ContainsKey(g.Key))
+                    .Select(g => new DeckCard { Card = cards[g.Key], Count = g.Count() })
+                    .ToList();
+
+                viewer.Decks.Add(new ShadowverseDeckEntry
+                {
+                    Name = d.DeckName,
+                    Number = slot++,
+                    Format = format,
+                    Class = classEntry,
+                    Sleeve = defaultSleeve,
+                    LeaderSkin = leaderSkin,
+                    RandomLeaderSkin = false,
+                    Cards = deckCards,
+                });
+            }
+        }
+    }
 }

SVSim.EmulatedEntrypoint/Controllers/DeckController.cs

@@ -96,9 +96,6 @@ public class DeckController : SVSimController
                     IsRandomLeaderSkin = s.IsRandomLeaderSkin,
                     LeaderSkinId = s.LeaderSkinId,
                 }),
-            // trial_deck_list: empty in 2026-05-23 prod; populated during tutorial campaigns —
-            // entry shape TBD until a capture lands with active content.
-            TrialDeckList = new(),
             MaintenanceCardList = new(), // sourced from same place as /load/index when wired
         };
 
@@ -112,6 +109,9 @@ public class DeckController : SVSimController
             response.UserDeckRotation = byFormat[Format.Rotation].Select(d => new UserDeck(d)).ToList();
             response.UserDeckUnlimited = byFormat[Format.Unlimited].Select(d => new UserDeck(d)).ToList();
             response.UserDeckMyRotation = byFormat[Format.MyRotation].Select(d => new UserDeck(d)).ToList();
+            // trial_deck_list is prod-emitted on /deck/info (All format) but omitted on /deck/my_list
+            // (specific format). Empty array in the 2026-05-23 prod capture.
+            response.TrialDeckList = new();
         }
         else
         {

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/DeckListResponse.cs

@@ -52,8 +52,11 @@ public class DeckListResponse
     [Key("user_leader_skin_setting_list")] public Dictionary<string, DefaultLeaderSkinSetting> UserLeaderSkinSettingList { get; set; } = new();
 
     /// <summary>
-    /// Trial / tutorial-specific decks. Empty in the 2026-05-23 prod capture; entry shape TBD.
+    /// Trial / tutorial-specific decks. Prod emits this on <c>/deck/info</c> (All format) but
+    /// OMITS the key entirely on <c>/deck/my_list</c> (specific-format) — controller mirrors that
+    /// asymmetry by leaving this null on specific-format responses. Empty array in the
+    /// 2026-05-23 prod capture; entry shape TBD.
     /// </summary>
     [JsonPropertyName("trial_deck_list")]
-    [Key("trial_deck_list")] public List<UserDeck> TrialDeckList { get; set; } = new();
+    [Key("trial_deck_list")] public List<UserDeck>? TrialDeckList { get; set; }
 }