feat(data): TaskRepository.DiscardPlanningAsync

src/ClaudeDo.Data/Repositories/TaskRepository.cs

@@ -346,6 +346,37 @@ public sealed class TaskRepository
         return count;
     }
 
+    public async Task<bool> DiscardPlanningAsync(
+        string parentId,
+        CancellationToken ct = default)
+    {
+        using var tx = await _context.Database.BeginTransactionAsync(ct);
+
+        var parent = await _context.Tasks
+            .AsNoTracking()
+            .FirstOrDefaultAsync(t => t.Id == parentId, ct);
+        if (parent is null || parent.Status != TaskStatus.Planning)
+        {
+            await tx.RollbackAsync(ct);
+            return false;
+        }
+
+        await _context.Tasks
+            .Where(t => t.ParentTaskId == parentId && t.Status == TaskStatus.Draft)
+            .ExecuteDeleteAsync(ct);
+
+        await _context.Tasks
+            .Where(t => t.Id == parentId)
+            .ExecuteUpdateAsync(s => s
+                .SetProperty(t => t.Status, TaskStatus.Manual)
+                .SetProperty(t => t.PlanningSessionId, (string?)null)
+                .SetProperty(t => t.PlanningSessionToken, (string?)null)
+                .SetProperty(t => t.PlanningFinalizedAt, (DateTime?)null), ct);
+
+        await tx.CommitAsync(ct);
+        return true;
+    }
+
     #endregion
 
     #region Queue selection