Can I vibe code Mesa?

Build a lightweight, self-hosted ecommerce automation worker system in TypeScript using Hono for Cloudflare Workers (or Node.js Fastify) and Upstash Redis for message queuing.

1. DATA ARCHITECTURE & STORAGE:
- Create schema for ExecutionLogs: id, webhook_topic, shopify_event_id, status (pending, completed, failed), payload (JSON), execution_time_ms, attempts, error_message.
- Store API key configurations securely in environment variables (SHOPIFY_ADMIN_API_TOKEN, KLAVIYO_API_KEY, SLACK_WEBHOOK_URL, GORGIAS_API_KEY).

2. WEBHOOK INGESTION ROUTER:
- Expose POST /api/webhooks/shopify endpoint.
- Read raw request body and verify HMAC signature against SHOPIFY_WEBHOOK_SECRET using crypto HMAC SHA256.
- Reject invalid signatures with HTTP 401.
- Extract 'X-Shopify-Topic' and 'X-Shopify-Webhook-Id'.
- Implement idempotency check: check Redis key `evt:${X-Shopify-Webhook-Id}`. If present, return HTTP 200 immediately to prevent duplicate runs.
- Set key in Redis with 24-hour TTL and enqueue payload to processing queue. Return HTTP 200 within 200ms.

3. WORKFLOW EXECUTION ENGINE:
- Implement modular step handlers for typical store automations:
  a) Order Tagging Flow: If topic is 'orders/create' and total_price > 200, call Shopify Admin GraphQL API to add tag 'VIP_ORDER'.
  b) High Risk Fraud Alert: If topic is 'orders/create' and order.risk_level == 'high', trigger immediate Slack incoming webhook with order details.
  c) Customer Segment Sync: If topic is 'customers/create', format payload and send POST to Klaviyo API to subscribe email to list.
  d) Out of Stock Alert: If topic is 'inventory_levels/update' and available <= 0, post alert to Slack.

4. RETRY & ERROR HANDLING:
- Wrap external API calls in exponential backoff retry logic (up to 4 retries: 1s, 5s, 25s, 125s).
- Handle HTTP 429 rate limit responses by parsing 'Retry-After' headers.
- Record full execution log in database upon completion or failure.
- Send Discord/Slack developer notification on final retry failure.

5. OUT OF SCOPE:
- No drag-and-drop visual node builder UI.
- No multi-tenant user authentication or dynamic OAuth app connections.
- Keep logic entirely as version-controlled TypeScript handler functions.

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