Timeslot includes the id of a repetition or false

program/views.py

@@ -100,7 +100,8 @@ def timeslot_entry(*, timeslot: TimeSlot) -> dict:
         "end": timeslot.end.strftime("%Y-%m-%dT%H:%M:%S"),
         "title": title,
         "schedule_id": schedule.id,
-        "is_repetition": timeslot.is_repetition,
+        # `Timeslot.repetition_of` is a foreign key that can be null
+        "is_repetition": timeslot.repetition_of.id if timeslot.repetition_of else False,
         "playlist_id": playlist_id,
         "schedule_default_playlist_id": schedule.default_playlist_id,
         "show_default_playlist_id": show.default_playlist_id,