diff --git a/aleksis/apps/lesrooster/models.py b/aleksis/apps/lesrooster/models.py
index 461d5138cda92da00499e4e2e7ceb00dbe09e838..13708570540847e94e4ed9d51148a91c9ef66a8e 100644
--- a/aleksis/apps/lesrooster/models.py
+++ b/aleksis/apps/lesrooster/models.py
@@ -375,9 +375,7 @@ class BreakSlot(Slot):
     """A break is a time period that can supervised and in which no lessons take place."""
 
     def __str__(self) -> str:
-        return (
-            f"{time_format(self.time_start)} - {time_format(self.time_end)}"
-        )
+        return f"{time_format(self.time_start)} - {time_format(self.time_end)}"
 
     class Meta:
         verbose_name = _("Break")
diff --git a/aleksis/apps/lesrooster/schema/slot.py b/aleksis/apps/lesrooster/schema/slot.py
index 7a1f9778274287b295538a61acf637659c25b0f3..5820ae009b2591b78d53701a7b554573ddfa69bc 100644
--- a/aleksis/apps/lesrooster/schema/slot.py
+++ b/aleksis/apps/lesrooster/schema/slot.py
@@ -1,5 +1,4 @@
 from django.core.exceptions import PermissionDenied
-from django.db.models import Q
 
 import graphene
 from graphene_django.types import DjangoObjectType