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Build a multi-channel inventory management system in Node.js/PostgreSQL with Next.js frontend.

1. DATA MODEL:
- MasterSKU (id, sku, title, base_price, total_stock, safety_buffer)
- Channel (id, name, api_type, credentials_json, status)
- ChannelMapping (id, master_sku_id, channel_id, external_sku, channel_stock)
- Order (id, external_order_id, channel_id, status, items_json, total_amount, created_at)
- StockLog (id, master_sku_id, change_amount, reason, reference_id)

2. CORE LOGIC:
- Maintain a central inventory count for each MasterSKU.
- Implement a webhooks consumer endpoint to ingest incoming order payloads from Shopify and Amazon.
- Upon receiving a new order: automatically deduct quantity from MasterSKU.total_stock, log the transaction in StockLog, and queue asynchronous outgoing inventory update jobs for all other mapped channels.
- Implement atomic SQL transactions with SELECT FOR UPDATE on MasterSKU stock records to prevent race conditions during concurrent orders.
- Calculated Available Stock = Math.max(0, MasterSKU.total_stock - MasterSKU.safety_buffer).

3. FAILURE HANDLING & RETRIES:
- Implement BullMQ task queue for outgoing API synchronization calls.
- Retries: Use exponential backoff (up to 5 attempts) to account for marketplace API rate limits (HTTP 429).
- Alerting: Log channel sync failures in a `SyncErrors` table if retries exhaust, and visually flag affected SKUs on the UI dashboard.

4. OUT OF SCOPE:
- Do not build native warehouse scanning hardware support.
- Omit complex return management workflows; focus strictly on stock synchronization and order intake.

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