Resolve "Mailbox-Test broken"

Closes #345 (closed)

aleksis/core/util/core_helpers.py

@@ -209,7 +209,8 @@ def celery_optional(orig: Callable) -> Callable:
 
     def wrapped(*args, **kwargs):
         if is_celery_enabled():
-            return task.delay(*args, **kwargs), False
+            with transaction.on_commit():
+                return task.delay(*args, **kwargs), False
         else:
             return orig(*args, **kwargs), True