fix: Kafka consumer poison pill causes infinite retry

VigilCareClinicalAPI/BackgroundServices/WarningAlertService.cs

@@ -33,6 +33,8 @@ public class WarningAlertService : BackgroundService
 
         _logger.LogInformation("WarningAlertService started — consumer group: warning-evaluator");
 
+        var guard = new PoisonPillGuard("warning-evaluator", _kafkaOptions.MaxPoisonRetries, _logger);
+
         try
         {
             while (!stoppingToken.IsCancellationRequested)
@@ -58,6 +60,7 @@ public class WarningAlertService : BackgroundService
                         stoppingToken);
 
                     consumer.Commit(result);
+                    guard.OnSuccess();
                 }
                 catch (OperationCanceledException)
                 {
@@ -65,8 +68,14 @@ public class WarningAlertService : BackgroundService
                 }
                 catch (Exception ex)
                 {
+                    if (result is not null && guard.ShouldSkip(result, ex))
+                    {
+                        consumer.Commit(result);
+                        continue;
+                    }
+
                     _logger.LogError(ex,
-                        "WarningAlertService failed on topic={Topic} offset={Offset} — not committing",
+                        "WarningAlertService failed on topic={Topic} offset={Offset} — will retry",
                         result?.Topic, result?.Offset.Value);
                     await Task.Delay(2000, stoppingToken);
                 }