Can I vibe code Modalyst?

Build a custom dropshipping middleware for Node.js and Postgres that syncs external supplier feeds with a Shopify store.

1. DATA MODEL:
- Supplier: id, name, feed_type (csv_url, ftp, rest_api), credentials, contact_email.
- ProductMapping: id, supplier_id, supplier_sku, shopify_product_id, shopify_variant_id, cost_price, markup_percentage, stock_quantity.
- SyncLog: id, supplier_id, status, items_updated, error_message, timestamp.

2. CORE FUNCTIONALITY:
- Scheduled Cron Job (Hourly): Ingest inventory feeds from registered suppliers. Parse CSV, XML, or JSON feeds, extract supplier_sku and stock_quantity.
- Pricing Logic: Calculate selling_price = cost_price * (1 + markup_percentage / 100). Apply a minimum price floor if configured.
- Sync Engine: Use Shopify GraphQL Admin API (productVariantsBulkUpdate) to batch-update stock levels and prices in Shopify. Log sync metrics.
- Order Routing Engine: Listen to Shopify orders/create webhooks. Filter line items by supplier. Generate a PDF purchase order or JSON API payload and email/POST it directly to the respective supplier. Update Shopify order fulfillment status with tracking numbers when suppliers POST updates back to our API endpoint.

3. FAILURE MODES TO HANDLE:
- Rate Limiting: Respect Shopify API GraphQL bucket limits using exponential backoff.
- Missing SKUs: If a supplier feed SKU does not exist in Shopify, log a warning and skip without crashing the batch process.
- Out of Stock Handling: If stock drop is 0, set quantity in Shopify to 0 immediately to prevent overselling.

4. OUT OF SCOPE:
- Public supplier directory UI.
- Supplier self-service portal.
- Payment processing or auto-charging merchant credit cards.

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