Merge Conflicts (#41)

Co-authored-by: Sayan Datta <sayan@Sayans-MacBook-Air.local>
Reviewed-on: sagnik/Project_Velocity#41

backend/migrations/versions/202604260002_calendar_event_done_status.sql

@@ -0,0 +1,6 @@
+ALTER TABLE user_calendar_events
+    DROP CONSTRAINT IF EXISTS user_calendar_events_status_check;
+
+ALTER TABLE user_calendar_events
+    ADD CONSTRAINT user_calendar_events_status_check
+    CHECK (status IN ('tentative', 'confirmed', 'done', 'cancelled'));