feat: added achievements

services/backend/apps/review/signals.py

@@ -2,13 +2,12 @@
 from django.db.models.signals import m2m_changed
 from django.dispatch import receiver
 
-from apps.review.models import Review
 from apps.task.models import CompetitionTask, CompetitionTaskSubmission
 
 
 @receiver(m2m_changed, sender=CompetitionTask.reviewers.through)
 def print_reviewers(sender, instance, action, **kwargs):
-    if action in ['post_add', 'post_remove', 'post_clear']:
+    if action in ["post_add", "post_remove", "post_clear"]:
         submissions = CompetitionTaskSubmission.objects.filter(task=instance)
         for submission in submissions:
-            submission.send_on_review()
+            submission.send_on_review()