Fix B6: Market concurrency lock, watchlist exclusion from cleanup, optimized trade ID deduplication query, and TradeHistoryWorker sync logic

src/Predictalytics.Worker/Services/MarketSyncWorker.cs

@@ -15,6 +15,7 @@ namespace Predictalytics.Worker.Services;
 public class MarketSyncWorker : BackgroundService
 {
     private static DateTime _lastDbError = DateTime.MinValue;
+    private static DateTime _lastClosedMarketSync = DateTime.MinValue;
     private readonly IServiceProvider _services;
     private readonly IPlatformStatisticsService _statsService;
     private readonly ILogger<MarketSyncWorker> _logger;
@@ -42,7 +43,13 @@ public class MarketSyncWorker : BackgroundService
 
                         using var platformCtx = PlatformLogContext.Push(p.PlatformName);
                         int cycleTotalSynced = 0;
-                        foreach (var includeClosed in new[] { false, true })
+                        var includeClosedOptions = new List<bool> { false };
+                        if (DateTime.UtcNow - _lastClosedMarketSync >= TimeSpan.FromDays(1))
+                        {
+                            includeClosedOptions.Add(true);
+                        }
+
+                        foreach (var includeClosed in includeClosedOptions)
                         {
                             _logger.LogWarning("[{Platform}] Syncing markets (includeClosed={Closed})...", p.PlatformName, includeClosed);
 
@@ -73,6 +80,11 @@ public class MarketSyncWorker : BackgroundService
                                 if (passSynced % 500 == 0)
                                     _logger.LogWarning("[{Platform}] Synced {Total} markets so far (includeClosed={Closed})...", p.PlatformName, passSynced, includeClosed);
                             }
+
+                            if (includeClosed)
+                            {
+                                _lastClosedMarketSync = DateTime.UtcNow;
+                            }
                         }
 
                         // Need a temporary scope for stats