# Inventory Module — Manual Review Checklist

High-risk module: stock/inventory changes require human confirmation.

- [ ] Stock decrement is atomic (conditional UPDATE, not read-then-write)
- [ ] Oversell prevented: `UPDATE ... SET qty = qty - ? WHERE qty >= ?`
- [ ] Reservation vs. deduction semantics are consistent
- [ ] Concurrent orders cannot both reserve the last unit
- [ ] Restock/return increments handled correctly
- [ ] Inventory events are idempotent (retry-safe)
- [ ] Async stock updates propagate to downstream (warehouse, carts) safely