Can I vibe code Vero?

Build an event-driven email trigger service in Node.js, Express, PostgreSQL, and BullMQ using Resend as the delivery provider.

1. DATA MODEL:
- users: id, email, properties (jsonb), unsubscribed (boolean), created_at.
- events: id, user_id, event_name, payload (jsonb), created_at.
- email_templates: id, slug, subject, body_html, body_text.
- pending_messages: id, user_id, template_id, run_at, status ('pending', 'sent', 'failed'), retry_count.

2. API ENDPOINTS:
- POST /api/v1/track: Accepts userId, eventName, and payload. Upserts user, inserts event record, and evaluates trigger rules.
- POST /api/v1/unsubscribe: Sets user unsubscribed status to true.

3. WORKFLOW ENGINE:
- Implement a trigger evaluator mapping event names to email templates.
- Support configurable delay offset (e.g., send 2 hours after 'cart_abandoned' event).
- Push message jobs into BullMQ with calculated execution delay.

4. WORKER PROCESSING:
- Consume BullMQ jobs. Check if user is unsubscribed before sending. Render HTML template using Handlebars with event payload and user properties.
- Send email via Resend SDK. On failure, execute exponential backoff retries up to 3 times.
- Handle webhook callbacks from Resend for hard bounces and update user records to prevent future sends.

5. OUT OF SCOPE:
- Visual drag-and-drop journey builder UI.
- Data warehouse live-syncing.
- Multi-channel push/SMS capabilities.

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