create cleanupEvents function

app/cleanup_events.py

@@ -0,0 +1,16 @@
+from datetime import datetime, timedelta
+
+def cleanupEvents(db, Event):
+    # calculate the date one month ago
+    one_month_ago = datetime.now() - timedelta(days=30)
+
+    # get events older than one month
+    old_events = db.session.query(Event).filter(
+        db.func.STR_TO_DATE(Event.scheduled_date, '%m-%d-%Y') < one_month_ago.date()
+    ).all()
+
+    # delete old events
+    for event in old_events:
+        db.session.delete(event)
+
+    db.session.commit()