feat(db): add ViewerArenaTwoPickRun entity + CandidatePair

SVSim.Database/Models/CandidatePair.cs

@@ -0,0 +1,16 @@
+namespace SVSim.Database.Models;
+
+/// <summary>
+/// One of the 2 pick-sets offered to the player on the current draft turn. Persisted as
+/// part of <see cref="ViewerArenaTwoPickRun.PendingPickSetsJson"/>. <see cref="Id"/> is the
+/// monotonic counter the client sends back as <c>selected_id</c> on /card_choose.
+/// </summary>
+public class CandidatePair
+{
+    public long Id { get; set; }
+    public int Turn { get; set; }
+    public int SetNum { get; set; }
+    public long CardId1 { get; set; }
+    public long CardId2 { get; set; }
+    public bool IsSelected { get; set; }
+}

SVSim.Database/Models/ViewerArenaTwoPickRun.cs

@@ -0,0 +1,64 @@
+using System.ComponentModel.DataAnnotations.Schema;
+using Microsoft.EntityFrameworkCore;
+
+namespace SVSim.Database.Models;
+
+/// <summary>
+/// One active Take Two run per viewer. Standalone (not a Viewer owned collection) to avoid
+/// the EF nav-include pitfalls in project_ef_nav_include_pitfall and to keep /load/index cheap.
+/// Row is deleted on /retire and /finish completion. Unique index on ViewerId enforces
+/// "one active run per viewer".
+/// <para>
+/// Lists are stored as jsonb strings (<c>{Field}Json</c>) per the project's inline-JSON column
+/// pattern (see DefaultDeckEntry.CardIdArray). Repos own (de)serialization.
+/// </para>
+/// </summary>
+[Index(nameof(ViewerId), IsUnique = true)]
+public class ViewerArenaTwoPickRun
+{
+    public long Id { get; set; }
+
+    public long ViewerId { get; set; }
+
+    /// <summary>Wire <c>entry_info.id</c> / <c>two_pick_entry_id</c>. Set to <see cref="Id"/> on insert.</summary>
+    public long EntryId { get; set; }
+
+    public int RewardScheduleId { get; set; }
+    public int ChallengeId { get; set; }
+
+    /// <summary>MAX(reward.WinCount) at creation time. Stamped on the row so mid-run reward-table edits don't change the cap.</summary>
+    public int MaxBattleCount { get; set; }
+
+    /// <summary>0 until /class_choose.</summary>
+    public int ClassId { get; set; }
+
+    /// <summary>0 until first battle; set to class default on /class_choose.</summary>
+    public long LeaderSkinId { get; set; }
+
+    [Column(TypeName = "jsonb")]
+    public string CandidateClassIdsJson { get; set; } = "[]";
+
+    /// <summary>1..15.</summary>
+    public int SelectTurn { get; set; }
+
+    public bool IsSelectCompleted { get; set; }
+
+    [Column(TypeName = "jsonb")]
+    public string SelectedCardIdsJson { get; set; } = "[]";
+
+    [Column(TypeName = "jsonb")]
+    public string PendingPickSetsJson { get; set; } = "[]";
+
+    /// <summary>Monotonic counter for CandidatePair.Id; advances by 2 each draft turn.</summary>
+    public long NextCandidateId { get; set; } = 1;
+
+    [Column(TypeName = "jsonb")]
+    public string ResultListJson { get; set; } = "[]";
+
+    public int WinCount { get; set; }
+    public int LossCount { get; set; }
+    public bool IsRetire { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+}