Can I vibe code ManyChat?

Build a lightweight Meta (Instagram/Messenger) DM automation engine in Node.js (TypeScript) with Express and PostgreSQL.

1. DATA MODEL:
- Store 'contacts' (psid, instagram_scoped_id, name, created_at, last_interaction_at, tags JSONB).
- Store 'triggers' (id, channel ['instagram', 'messenger'], trigger_type ['keyword', 'comment_keyword'], keyword, flow_definition JSONB).
- Store 'message_logs' (contact_id, direction, text, raw_payload, sent_at).

2. API INTERACTION & WEBHOOKS:
- Implement GET /webhook/meta for Meta Webhook verification (hub.verify_token).
- Implement POST /webhook/meta to ingest incoming messages and post comments.
- Enforce duplicate event suppression using Redis or an in-memory TTL cache with message ID as key.
- Parse incoming message payload. Check if last_interaction_at is within 24 hours (Meta policy). If outside 24 hours, abort automated sending unless using allowed message tags.

3. AUTOMATION EXECUTION ENGINE:
- Exact and fuzzy match incoming text against defined 'triggers'.
- If triggered, send automated message reply via Meta Graph API (POST https://graph.facebook.com/v19.0/me/messages).
- Support sending quick reply buttons, image cards, and dynamic Shopify discount link URLs.
- Store sent messages and tag contacts dynamically based on trigger actions (e.g., add tag 'lead_captured').

4. FAILURE HANDLING:
- Log Meta API error codes (e.g., token expired, message window expired, user blocked).
- Implement exponential backoff retry for HTTP 5xx responses from Meta.

5. OUT OF SCOPE:
- Do not build a visual drag-and-drop flowchart editor; use JSON flow definitions.
- Exclude WhatsApp API for MVP.

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