Fix crash

tournaments/models/group_stage.py

@@ -4,7 +4,7 @@ from django.db import models
 from . import SideStoreModel, Tournament, FederalMatchCategory
 import uuid
 from ..utils.extensions import format_seconds
-# from datetime import datetime, timedelta
+from datetime import timedelta
 from django.utils import timezone
 from django.db.models import Count, Q