Can I vibe code Byrd?

Build an e-commerce fulfillment and warehouse management backend in Node.js (TypeScript) using Express and PostgreSQL (Prisma ORM).

DATA MODEL REQUIREMENTS:
1. Merchant: id, name, api_key, webhook_secret.
2. Warehouse: id, name, location_code, country_code.
3. StorageLocation: id, warehouse_id, barcode, type (SHELF, PALLET), daily_rate.
4. InventoryItem: id, merchant_id, sku, barcode, lot_number, best_before_date, total_qty, reserved_qty.
5. StorageAssignment: id, inventory_item_id, storage_location_id, quantity, space_occupied_units.
6. Order: id, merchant_id, external_order_id, recipient_address (json), status (PENDING, PROCESSING, SHIPPED, DELIVERED, CANCELLED), total_weight_g.
7. OrderLine: id, order_id, inventory_item_id, quantity_ordered, quantity_allocated.
8. Shipment: id, order_id, carrier (DHL, DPD, POST), tracking_number, label_url, shipping_cost, workforce_fee, pack_material_fee.
9. Return: id, order_id, status (REQUESTED, RECEIVED, INSPECTED, RESTOCKED), tracking_number.
10. Invoice: id, merchant_id, billing_period_start, billing_period_end, pick_fees, storage_fees, shipping_fees, inbounding_fees, total_amount, pdf_url.

CORE WORKFLOWS & LOGIC:
1. Webhook Engine: Listen for incoming Shopify/WooCommerce order events. Parse recipient address, item SKUs, and quantities. Validate address format.
2. Order Routing & Inventory Allocation: Automatically route orders to the warehouse holding stock. Deduct available inventory using FEFO (First-Expired, First-Out) logic based on best_before_date and lot_number.
3. Carrier Label Generation Mock: Integrate mock clients for DHL and DPD Europe APIs. Calculate billable weight, select cheapest rate, generate tracking number, and update order status to SHIPPED.
4. Returns Processing Endpoint: Accept return requests, generate return shipping labels, handle webhook triggers when package arrives at warehouse, and update inventory upon inspection (RESTOCKED or DISCARDED).
5. Granular Invoice Calculator: Monthly cron task that calculates:
   - Storage Costs: Sum of occupied storage_location daily_rate * days occupied.
   - Inbound/Acceptance Fees: One-off fee per shipment received + per-box counting fee.
   - Pick/Pack Fees: Base pick fee per order + item pick fee * count + packaging material size fee.
   - Shipping Costs: Actual carrier cost + service margin fee.
   Generate aggregated PDF invoice report and output line-item CSV/Excel breakdown.

EXPLICITLY OUT OF SCOPE:
- Frontend UI (REST API only).
- Mobile barcode scanner application.
- Physical hardware integrations (printers, scale interfaces).

TECHNICAL STACK & DEPLOYMENT:
- TypeScript, Node.js, PostgreSQL, Prisma, Express.
- Jest unit tests for the FEFO allocation algorithm and invoice fee calculator.
- Dockerfile included.

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