[GATEWAY] → 2025-10-26 12:10:05 → Request /api/payments  
[AUTH] → 2025-10-26 12:10:05 → Token verified  
[BILLING] → 2025-10-26 12:10:06 → ERROR: Connection refused  
[EMAIL] → 2025-10-26 12:10:07 → Skipped notification (billing failed)

[GATEWAY] 12:00:00 trace=1a2b → POST /api/payments  
[AUTH] 12:00:00 trace=1a2b → Token OK (12ms)  
[BILLING] 12:00:01 trace=1a2b → Sent charge request → OK (310ms)  
[WEBHOOK] 12:00:03 trace=1a2b → ERROR: signature mismatch  
[PAYMENTS] 12:00:03 trace=1a2b → Payment marked failed  
[EMAIL] 12:00:04 trace=1a2b → Notification: “Payment declined”

[GATEWAY] 10:05:00 trace=cc99 → GET /api/user/summary  
[AUTH]    10:05:00 trace=cc99 → OK  
[PROFILE] 10:05:00 trace=cc99 → SELECT user  
[BALANCE] 10:05:00 trace=xx01 → SELECT wallet (другой trace)  
[SUMMARY] 10:05:01          → Собран ответ  
Иногда в summary старый баланс, свежий профиль.

[GATEWAY] 19:15:10 trace=bb88 → POST /api/notify  
[QUEUE]   19:15:10 trace=bb88 → Enqueued notify_user  
[WORKER]  19:15:11 trace=bb88 → ERROR: SMTP 421 temp fail  
[WORKER]  19:15:41 trace=bb88 → Retry 1  
[WORKER]  19:16:11 trace=bb88 → Retry 2  
[WORKER]  19:16:41 trace=bb88 → Dropped after 2 retries  
Жалобы: письмо иногда не приходит.

[GATEWAY] 08:00:00 trace=aa77 → POST /api/bulk-upload  
[UPLOAD]  08:00:00 trace=aa77 → Start batch size=5000  
[DB]      08:00:02 trace=aa77 → ERROR: deadlock on table files  
[UPLOAD]  08:00:02 trace=aa77 → Retrying chunk  
[DB]      08:00:05 trace=aa77 → OK after retry  
Иногда часть файлов не видна в UI.

Bind for 0.0.0.0:8080 failed: port is already allocated