notify

name	notify
description	Push notifications, SMS, in-app notifications, notification preferences, multi-channel delivery.

Activate When

• /godmode:notify, "push notifications", "SMS alerts"
• "Twilio", "FCM", "APNs", "OneSignal", "in-app"
• "notification center", "notification preferences"
• "notification digest", "quiet hours"

Workflow

1. Architecture Discovery

grep -r "sendgrid\|twilio\|firebase.*messaging" \
  --include="*.ts" --include="*.js" -l 2>/dev/null
grep -r "NotificationService\|notification_service" \
  --include="*.ts" --include="*.py" -l 2>/dev/null

Channels: Push | SMS | Email | In-App | Webhook
Categories & Priority:
  Security (critical): 2FA, login alerts, password
  Transactional (high): orders, payments, shipping
  Social (normal): mentions, comments -- batchable
  Marketing (low): promotions, digest -- batchable

2. Provider Selection

• Push: FCM (Android) + APNs (iOS). Cross-platform: OneSignal. Web: FCM or Web Push API.
• SMS: Twilio (best DX). AWS SNS (cost-sensitive). OTP: Twilio Verify.
• Email: SendGrid/Resend. Fallback: SES/Postmark.
• In-App: WebSocket/SSE. Fallback: polling.

3. Notification Service

Event -> Service -> Preference Check + Quiet Hours
  -> Channel Router -> Per-channel queues
  -> Provider delivery -> Delivery tracking

• NotificationType: defaultChannels, requiredChannels, allowedChannels, templates, priority, batchable
• Flow: idempotency check -> resolve channels via prefs -> quiet hours -> rate limit (>15/hour -> batch) -> dispatch per-channel queues

IF security notification: bypass quiet hours + prefs. IF >15 notifications/hour to same user: batch them.

4. Preference Management

Per-type, per-channel toggles. Security alerts have required channels (cannot disable). Global settings: quiet hours (timezone-aware), digest frequency, unsub.

One-click unsubscribe handler for email compliance.

5. Database Schema

Core tables: notifications, notification_deliveries, device_tokens, notification_preferences, digest_queue. Key indexes: (user_id, created_at DESC), (user_id, read_at) WHERE read_at IS NULL.

6. Real-Time In-App (WebSocket)

• /ws/notifications with token auth
• Track connections per userId (multi-device)
• On connect: send unread count
• Heartbeat 30s, terminate stale after 60s

7. REST API

GET /notifications (cursor-paginated, filter), GET /notifications/unread-count, PATCH /notifications/:id/read, POST /notifications/mark-all-read, GET/PUT /notifications/preferences.

8. Batching & Digest

• Critical/high: always immediate

• 15/hour same user: batch

• Same collapseKey within 5m: merge
• Hourly: "John and 4 others commented"
• Daily: summary at user's preferred time
• Weekly: low-engagement users

9. Delivery Tracking

Track: sent -> delivered -> read / failed / bounced. Alert on: push delivery <90%, SMS <95%, opt-out spike >2%, stale tokens >10%.

Hard Rules

1. NEVER send without checking preferences first.
2. NEVER send SMS without explicit opt-in (TCPA).
3. NEVER hardcode provider credentials.
4. ALWAYS use idempotency keys for every dispatch.
5. ALWAYS enforce rate limits per user per channel.
6. NEVER send push without handling stale tokens.
7. ALWAYS queue async with retry and DLQ.
8. NEVER serve unsanitized user-generated content.

TSV Logging

Append .godmode/notify.tsv:

timestamp	component	channel	provider	status	details

Keep/Discard

KEEP if: notification delivered AND preferences
  checked AND delivery status tracked.
DISCARD if: not received OR preferences bypassed
  OR duplicate sends.

Stop Conditions

STOP when FIRST of:
  - All channels deliver with preference checks
  - Quiet hours enforced
  - Idempotency works

Autonomous Operation

On failure: git reset --hard HEAD~1. Never pause.

Error Recovery

Failure	Action
Push token invalid	Remove on InvalidRegistration
SMS failed	Check error code, suppress invalid
WebSocket dropped	Auto-reconnect, fetch missed
Queue stalled	Check Redis/SQS, verify worker
Timezone missing	Fall back to UTC with warning