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diff --git a/backend/modules/calendar/service.py b/backend/modules/calendar/service.py
index 9e0afcb..9884fa5 100644
--- a/backend/modules/calendar/service.py
+++ b/backend/modules/calendar/service.py
@@ -55,11 +55,11 @@ def get_calendar_events(
         query = query.filter(
             or_(
                 # Case 1: Event has duration and overlaps
-                (CalendarEvent.end is not None)
+                (CalendarEvent.end != None)  # Use SQLAlchemy comparison # noqa: E711
                 & (CalendarEvent.start < end)
                 & (CalendarEvent.end > start),
                 # Case 2: Event is a point event within the range
-                (CalendarEvent.end is None)
+                (CalendarEvent.end == None)  # Use SQLAlchemy comparison # noqa: E711
                 & (CalendarEvent.start >= start)
                 & (CalendarEvent.start < end),
             )
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