Can I vibe code SMSBump?

Build an internal SMS automation service in Node.js and Next.js to replace core SMSBump functionality using Twilio API and Shopify Webhooks.

1. DATA MODEL:
- Store Customers (id, shopify_customer_id, phone, location_timezone, sms_consent_status, consent_timestamp, opt_out_timestamp).
- Store Messages (id, customer_id, campaign_id, body, status, sent_at, twilio_sid).
- Store Campaigns (id, title, message_template, scheduled_at, status).

2. CORE FUNCTIONALITY:
- Webhook Listener: Express/Next.js API route receiving Shopify webhooks for 'checkouts/create', 'checkouts/update', and 'orders/create'.
- Cart Abandonment Logic: If a checkout remains unfulfilled after 30 minutes, enqueue an SMS event unless an order webhook was received for that checkout token.
- Quiet Hours Engine: Before calling Twilio API, check recipient's local timezone. If local time is between 9 PM and 8 AM, delay the message execution until 8:01 AM local time.
- Opt-Out Handler: Express endpoint receiving incoming SMS webhooks from Twilio. If message body contains 'STOP', 'UNSUBSCRIBE', or 'CANCEL', immediately set sms_consent_status = false, log opt_out_timestamp, and respond with Twilio TwiML standard unsubscribed confirmation.

3. INTEGRATION DETAILS:
- Integrate Twilio Node SDK using environment variables for TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN, and TWILIO_PHONE_NUMBER.
- Enforce strict subscriber consent verification before dispatching any automated text.

4. FAILURE MODES & OUT OF SCOPE:
- Handle Twilio rate limits (429) using an exponential backoff queue (e.g., BullMQ with Redis).
- Skip sending if phone number formatting fails E.164 validation.
- Out of scope: 10DLC TCR registration UI, drag-and-drop flow builder UI.

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