[2026-10-10 21:56:34] production.WARNING: FCM notification failed {"fcm_token":"cD5arz8JTu-zxc16VxHZ...","error":"NotRegistered"} 
[2026-10-10 21:56:34] production.WARNING: FCM notification failed {"fcm_token":"e6hhsCKUR1CTQKN6O5cr...","error":"NotRegistered"} 
[2026-10-10 22:06:00] production.INFO: Backend received startDate: 2026-10-01 00:00:00  
[2026-10-10 22:06:00] production.INFO: Backend received endDate: 2026-10-31 23:59:59