- VAPID-based push via web-push package
- push_subscriptions table: endpoint + keys per user (upsert on conflict)
- GET /api/push/vapid-key — public key for subscribe flow
- POST/DELETE /api/push/subscribe — store/remove subscription
- POST /api/push/test — manual test notification
- Hourly scheduler: notifies users day before homework due + countdown expires
- SW: push event handler shows notification; notificationclick opens /app
- Settings: Push section with enable/disable/test buttons, auto-detects
browser support and VAPID availability
Simon