Arxitektura

Bitta ilova uch transportni taqdim etadi — hammasi bir xil application yadrosini (use-case’lar) ulashadi. Domen qatlami infratuzilmadan mustaqil (DDD / hexagonal): domain → application → infrastructure / interfaces.

Uch transport

Transport	Vazifa
HTTP / REST	API + webhook (/webhooks/{provider}), health, metrics, admin panel
gRPC	Servis-servis: Notification / Template / Preference / Provider Service — REST bilan bir xil interfeys
Kafka	Consumer loyiha event’larini iste’mol qiladi (faqat consume) va yuborishga ulaydi

Ma’lumot va state

• PostgreSQL + typed so’rovlar. Yozuvlar (notifications, delivery_attempts, callbacks) oylik partition qilinadi.
• Queue = jadval. Worker status='pending' yozuvlarni FOR UPDATE SKIP LOCKED bilan oladi — alohida broker shart emas.
• Background job’lar — dispatcher, scheduler, retry (kvadratik backoff), cleanup, partition maintenance.
• Realtime backplane — in-app socket fan-out uchun pluggable: Redis Pub/Sub yoki Firebase.
• DB-per-service — cross-service FK yo’q. recipient_user_id logical ref. Secret DB’da emas — faqat env:/vault:// reference.