Enhance UI, add AI integration, improve logging and database stats

src/Predictalytics.Worker/Services/PollingWorker.cs

@@ -36,7 +36,7 @@ public class PollingWorker : BackgroundService
                 using (var scope = _services.CreateScope())
                 {
                     var repo = scope.ServiceProvider.GetRequiredService<ITraderRepository>();
-                    tradersToProcess = await repo.GetAllAsync(take: 100, ct: stoppingToken);
+                    tradersToProcess = await repo.GetTradersForPollingAsync(take: 100, ct: stoppingToken);
                 }
                 
                 _logger.LogWarning("📊 Polling {Count} traders...", tradersToProcess.Count);
@@ -121,7 +121,7 @@ public class PollingWorker : BackgroundService
                         {
                             // Final deduplication of the batch itself
                             var uniqueNewTrades = newTrades
-                                .GroupBy(tr => tr.PlatformTradeId)
+                                .GroupBy(tr => tr.PlatformTradeId, StringComparer.OrdinalIgnoreCase)
                                 .Select(g => g.First())
                                 .ToList();
 
@@ -135,7 +135,7 @@ public class PollingWorker : BackgroundService
                             }
                             catch (Exception ex) when (ex.ToString().Contains("Duplicate entry") || (ex.InnerException?.Message.Contains("Duplicate entry") ?? false))
                             {
-                                _logger.LogWarning("{Trader}: Skipping batch due to duplicate entries (likely already imported)", trader.DisplayName);
+                                _statsService.TrackDuplicateError(trader.Platform, 1);
                             }
                         }
                         else