Yetkazish & callback

Xabar queue’ga qo’yiladi, dispatcher provider’ga yuboradi, provider callback (webhook) orqali yetkazish holatini qaytaradi. Har urinish notification_delivery_attempts da, har callback notification_callbacks da qayd etiladi.

Status lifecycle

pending → queued → sending → sent → delivered → opened
   │                          │
   ├→ scheduled (kelajak)     └→ failed / bounced
   └→ cancelled

Status	Ma’no
pending	Queue’da, dispatcher oladi
scheduled	scheduled_at kelguncha kutadi
queued / sending	Provider’ga yuborilmoqda
sent	Provider qabul qildi (ack)
delivered	Recipient qabul qildi (callback)
opened	Email/push ochildi
failed	Barcha retry tugadi (DLQ)
bounced	Email/SMS bounce (invalid manzil)
cancelled	Bekor qilindi

Retry va idempotency

• Retry — muvaffaqiyatsizlikda kvadratik backoff (30s, 120s, 270s…). max_retries tugagach failed.
• Idempotency — idempotency_key bir xil xabarni takror yubormaydi.
• Webhook — POST /webhooks/{provider}; provider_message_id orqali xabar topiladi va status yangilanadi.