Update app.py

app.py

@@ -140,7 +140,7 @@ def check_and_send_reminders():
 
 if not hasattr(app, "reminder_scheduler_started"):
     scheduler = BackgroundScheduler()
-    scheduler.add_job(check_and_send_reminders, 'interval', minutes=1)
+    scheduler.add_job(check_and_send_reminders, 'interval', seconds=20)
     scheduler.start()
     app.reminder_scheduler_started = True