mercadodevida/work/artifacts/F-021/implementer.md

Implementer — F-021 Orders module

Summary

Implemented orders module with item snapshots, explicit state machine, ownership-scoped reads, and domain event publishing for OrderCreated, OrderPaid and OrderCancelled.

Files changed

• project/migrations/016_orders.js
• project/src/modules/orders/**
• project/src/app/build-app.ts
• project/src/app/tests/orders.itest.ts

Acceptance evidence

• AC1 snapshot survives: orders.itest.ts GET /orders/:id returns name/sku/price/tax/discount exactly as provided at create time.
• AC2 illegal transition rejected: SHIPPED -> PENDING returns 409 ORDER_STATE_TRANSITION_INVALID.
• AC3 state machine: order-state-machine.test.ts covers happy path and terminal states; order-service.test.ts covers creation event emission and rejected transitions.
• AC4 OrderCreated emitted: order-service.test.ts captures the event.

Commands run

• cd project && npm run lint/typecheck/build/test passed
• cd project && TEST_DATABASE_URL='postgres://mdv:mdv_dev_only@localhost:5432/mdv_test' npm run test:integration -- orders.itest passed; 13 files, 50 tests
• ./scripts/verify.sh passed

Notes

• No new runtime dependency.
• Refunds and admin UI intentionally deferred to F-023+.
• Event publisher is no-op for v1; F-024 will provide an implementation.