Have the security worker remove failed notifications from Clair

workers/security_notification_worker.py

@@ -39,8 +39,11 @@ class SecurityNotificationWorker(QueueWorker):
         if should_retry:
           raise JobException()
         else:
-          # Return to mark the job as "complete", as we'll never be able to finish it.
+          # Remove the job from the API.
           logger.error('Failed to handle security notification %s', notification_name)
+          secscan_api.mark_notification_read(notification_name)
+
+          # Return to mark the job as "complete", as we'll never be able to finish it.
           return False
 
       self.extend_processing(_PROCESSING_SECONDS, json.dumps(data))