Can I vibe code Nacelle?

Build a lightweight headless commerce data synchronization engine and GraphQL gateway in TypeScript using Node.js, Fastify, Redis, and Prisma with PostgreSQL.

1. DATA MODEL & SCHEMA:
- Create models for Products, Variants, Collections, Media, and Content (CMS entries).
- Product: id, externalId (Shopify ID), handle, title, description, vendor, status, updatedAt.
- Variant: id, productId, externalId, sku, title, price, compareAtPrice, availableForSale, inventoryQuantity.
- Content: id, handle, type, payload (JSONB), updatedAt.
- Store data in PostgreSQL and mirror indexed catalog JSON objects into Redis for low-latency lookups.

2. INGESTION & WEBHOOK PIPELINE:
- Implement HTTP webhook endpoints for Shopify (`products/create`, `products/update`, `inventory_levels/connect`, `inventory_levels/set`).
- Verify HMAC signatures on incoming requests.
- Enqueue webhook payloads into a Redis-backed queue (BullMQ).
- Implement a worker process that processes queued webhooks, fetches full product details if payload is partial, updates PostgreSQL, and refreshes the Redis cache key.
- Implement leaky-bucket rate limiting for outgoing Shopify GraphQL API calls to prevent quota exhaustion.

3. GRAPHQL GATEWAY:
- Expose a GraphQL API endpoint using Mercurius or Apollo Server.
- Implement queries: `productByHandle(handle: String!)`, `products(first: Int, after: String)`, `contentByHandle(handle: String, type: String)`.
- Serve product and variant queries directly from Redis key-value store to maintain under 50ms response times.
- Implement cross-linking logic so a Content entry payload can reference a Product by handle.

4. RECONCILIATION & FAILURE MODES:
- Create a scheduled cron job (Reconciliation) that fetches Shopify updated timestamps since the last check to catch any dropped webhooks.
- Handle failure cases: duplicate webhook execution (idempotency using externalId + timestamp), rate-limit retry logic with exponential backoff, and missing database relations.

5. OUT OF SCOPE:
- Do not build a user-facing dashboard UI.
- Do not build a custom checkout engine (redirect checkout requests directly to Shopify Checkout URL).

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