Add missing imports

aleksis/apps/chronos/models.py

@@ -7,6 +7,7 @@ from datetime import date
 from typing import Any
 
 from django.contrib.contenttypes.models import ContentType
+from django.core.exceptions import PermissionDenied
 from django.core.validators import MinValueValidator
 from django.db import models
 from django.db.models import Q, QuerySet

aleksis/apps/chronos/util/chronos_helpers.py

@@ -2,7 +2,7 @@ from datetime import date, datetime, timedelta
 from typing import TYPE_CHECKING, Optional
 
 from django.db.models import Count, Q
-from django.http import HttpRequest
+from django.http import HttpRequest, HttpResponseNotFound
 from django.shortcuts import get_object_or_404
 
 from guardian.shortcuts import get_objects_for_user