Reusable, non-blocking notification layer on top of the Queue Bus:
notify.send(event, to, data) records a Notification + per-channel
NotificationDelivery, queues them, and a daemon consumer delivers via
pluggable channel adapters (in-app, email, chat) inheriting retry,
backoff and dead-letter.
- Jinja2 email system: branded, dark-mode, Outlook-safe base layout +
per-event templates (security/backup/monitoring/welcome/invitation).
The legacy inline f-string email was removed and now renders here.
- In-app center API (inbox/unread-count/mark-read) + per-user Socket.IO push.
- Admin delivery log (stats/filter/retry).
- Email providers (SMTP/SendGrid/Postmark/SES/Mailgun) with encrypted
credentials + test; the email adapter prefers the default provider and
falls back to the legacy SMTP config; surfaced in ConnectionRegistry.
- NotificationService.send_all() is now a non-blocking shim that routes
system alerts through the bus. Migrations 023 + 024.
Tests: backend/tests/test_notification_bus.py (20). Full suite: 391 passed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
