Can I vibe code CartStack?

Build a lightweight custom cart recovery engine in Node.js/TypeScript using Fastify, Redis (BullMQ), Postgres, and Resend/Twilio integrations.

1. DATA MODEL:
- Create tables for `sessions` (id, cart_id, customer_email, customer_phone, items_json, total_value, status: 'active' | 'abandoned' | 'recovered', created_at, updated_at).
- Create tables for `campaign_logs` (id, session_id, channel: 'email' | 'sms', sequence_step, status, sent_at).
- Create tables for `suppressions` (email, phone, unsubscribed_at).

2. TRACKING SNIPPET & ENDPOINTS:
- Build a lightweight client-side JavaScript snippet that monitors checkout form fields (email, phone, cart changes) and sends debounced POST payloads to `/api/track` on `blur` or `change` events.
- Implement endpoint `/api/track` to upsert session records and push a delayed BullMQ job (delay: 30 minutes) keying off `session_id`.
- Implement endpoint `/api/order-complete` (webhook target) that matches the completed order cart/email, marks session status as 'recovered', and removes pending BullMQ recovery jobs.

3. WORKFLOW EXECUTOR:
- Set up BullMQ worker process that triggers when the 30-minute delay expires. If session state is still 'active', mark as 'abandoned' and process sequence step 1.
- Check suppression table for opt-outs before dispatching.
- Send Step 1 email via Resend API with dynamic HTML template including items and direct cart rebuild URL.
- Queue Step 2 SMS via Twilio API after 24 hours if cart remains unrecovered.

4. FAILURE MODES & EDGE CASES:
- Race conditions: Ensure order webhook processing explicitly cancels active queue jobs using atomic Redis commands.
- Handle TCPA opt-outs by listening for Twilio STOP webhooks and updating suppressions table immediately.
- Rate limit `/api/track` endpoint to prevent bot spam.

5. OUT OF SCOPE:
- Complex drag-and-drop template builders (use React Email / HTML templates).
- Multi-tenant billing or complex user roles.

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