Can I vibe code Shopping Feed?

Build a NodeJS product feed syndication worker using TypeScript, Express, and Prisma with PostgreSQL.

1. DATA MODEL:
- Store: ID, name, api_key.
- Product: ID, store_id, title, description, sku, price, compare_at_price, inventory_quantity, barcode, status, updated_at.
- FeedConfig: ID, store_id, channel_type (ENUM: GOOGLE_SHOPPING, META_ADS), output_url, field_mappings (JSON), generated_at.
- MappingRule: ID, feed_config_id, source_attribute, target_attribute, transformation_rule (ENUM: DIRECT, CONCAT, APPEND_TEXT, TAXONOMY_MAP).

2. CORE FUNCTIONALITY:
- Implement a web server exposed route `/feeds/:store_id/:channel_type.xml` that outputs valid RSS 2.0 / XML compliant with Google Merchant Center specification.
- Implement scheduled worker jobs using BullMQ to fetch updated products via store REST/GraphQL endpoints every 6 hours.
- Support dynamic field transformation rules: allow mapping store custom metadata to required channel attributes (`g:brand`, `g:gtin`, `g:condition`, `g:availability`).
- Calculate `g:availability` dynamically based on `inventory_quantity > 0` ('in_stock' vs 'out_of_stock').
- Output clean CDATA wrappers around product descriptions and escape non-ASCII characters.

3. ERROR HANDLING & FAILURE MODES:
- Cache output XML files on local storage or S3 to avoid regenerating feeds on every HTTP GET request.
- Log missing required Google Merchant attributes (e.g., missing GTIN or Brand) to an errors log table rather than crashing feed generation.
- Return standard HTTP 404 if the specified feed slug is invalid or inactive.

4. OUT OF SCOPE:
- Bi-directional order ingestion from channels.
- API direct sync to Amazon SP-API or Walmart marketplace APIs.
- UI drag-and-drop rule builder (focus purely on functional API and engine).

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