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Build a lightweight, event-driven customer journey and marketing automation backend using Node.js, TypeScript, PostgreSQL (Prisma), BullMQ, and Redis.

1. DATA MODEL:
- Customer: id, email, phone, attributes (JSONB), opt_in_email (boolean), opt_in_sms (boolean), created_at.
- Event: id, customer_id, event_name (e.g., 'order_placed', 'cart_abandoned'), payload (JSONB), timestamp.
- Workflow: id, name, status ('active', 'draft'), steps (JSONB array defining nodes and connections).
- WorkflowExecution: id, workflow_id, customer_id, current_step_id, status ('pending', 'completed', 'failed'), next_run_at.
- SuppressionList: email, phone, reason, created_at.

2. WORKFLOW ENGINE:
- Implement an execution worker using BullMQ that processes steps sequentially per workflow execution.
- Step types to handle:
  a) TRIGGER: Listens to incoming events matching criteria.
  b) DELAY: Pause execution for a fixed duration (e.g., 2 hours).
  c) CONDITION: Evaluate JSON path conditions on customer attributes or event payload (e.g., total_spent > 100).
  d) ACTION_EMAIL: Call Postmark/Resend API with dynamic HTML variables.
  e) ACTION_SMS: Call Twilio API for text sending (check SMS quiet hours 9 PM-8 AM customer local time).

3. INGRESS & INTEGRATION:
- Build a REST endpoint /api/v1/events to ingest customer activities.
- Automatically update Customer attributes on ingestion.
- Check if ingested events trigger any active Workflows and create a WorkflowExecution instance.

4. COMPLIANCE & DELIVERABILITY:
- Include single-click unsubscribe link headers in all outgoing emails.
- Provide an endpoint /api/v1/unsubscribe to handle instant opt-outs and update the SuppressionList.
- Provide webhook handlers for Postmark bounce and spam complaint notifications to immediately block future sends to impacted emails.

5. OUT OF SCOPE:
- No drag-and-drop UI builder (use raw JSON configs for workflows).
- No custom ad network sync capabilities.
- No predictive AI analytics.

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