Add type annotations

program/services.py

@@ -416,8 +416,7 @@ def make_conflicts(sdl, schedule_pk, show_pk):
     return conflicts
 
 
-# TODO: add type annotations
-def generate_timeslots(schedule):
+def generate_timeslots(schedule: Schedule) -> list[TimeSlot]:
     """
     Returns a list of timeslot objects based on a schedule and its rrule
     Returns past timeslots as well, starting from first_date (not today)