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Task: Inbound write-back consumer + inbox + parked messages (trading)

Description

Give trading-service its first inbound integration: consume accounting.invoice.processed (versioned routing key, payload from libs/platform/event-contracts), apply the resulting state transition to the referenced source entity, re-derive the parent aggregate's derived status, record an activity entry — all in ONE transaction with the processed_event inbox insert (ADR-0068). Invalid-state/unresolvable events are parked (queryable parked_message row + metric), never dropped, never crash-looped. Covers FR-1, FR-2, FR-3.

Acceptance Criteria

  • [x] A source entity in a transitionable state receives invoice.processed → transition + parent re-derivation + activity entry, single transaction (AC: 1)
  • [x] Duplicate delivery of the same eventId is a no-op (inbox PK hit → ack, no second activity entry) (AC: 2)
  • [ ] Event for an entity whose current state does not permit the transition → parked_message row with reason INVALID_STATE, metric incremented, entity unchanged (AC: 3) — park/reason/unchanged DONE + proven; the metric clause (acme_trading_parked_messages_total) is task 009 per test-manifest
  • [x] Every sourceEntityType the event contract can carry is handled; an entity that cannot be resolved → parked UNRESOLVABLE_ENTITY (AC: 4)
  • [x] Tenant derived from event payload and validated against the entity row (fail-closed) (AC: 5)
  • [x] RabbitMQ binding documented as operator-applied topology change; consumer disable-by-unbinding rollback documented (AC: 6)

Technical Details

  • New src/integration/ module: invoice-processed.consumer.ts (bootstrap mirroring inventory's trading-event-consumer.ts), invoice-processed.handler.ts (application), ports + MikroORM repos for processed_event / parked_message.
  • Entity transitions via the existing status-transition methods (add the method where an aggregate lacks one) — the target state is set NOWHERE else (§3.4 anti-pattern 4).
  • Migration Migration_005_inbox_parked (trading schema, snake_case).
  • Parent re-derivation reuses the existing status deriver + cache-update path.

Dependencies

  • [ ] Task 001 (RED suites)
  • [ ] RabbitMQ topology (queue + binding on accounting exchange) — operator-applied for deploy; testcontainers covers CI

Effort Estimate

  • Size: L
  • Hours: 24
  • Parallel: true

Definition of Done

  • [ ] Acceptance tests written (Gherkin scenarios)
  • [ ] Unit tests written and failing (red phase) — then passing after implementation
  • [ ] Integration tests written and passing
  • [ ] E2E tests pass (if UI changes involved)
  • [ ] Code implemented and makes all tests pass (green phase)
  • [ ] Code refactored for quality (refactor phase — DRY, naming, simplification)
  • [ ] Self-reviewed for bugs, edge cases, and conventions
  • [ ] Automated code review passed (/pm:epic-review)
  • [ ] PR created and CI checks pass
  • [ ] Production verification steps documented
  • [ ] Deployed and verified in production (see /pm:prod-verify)
  • [ ] Architecture decisions referenced in Dev Notes (if architecture.md exists)
  • [ ] Dev Agent Record completed (model, files, completion notes)

Dev Notes

Architecture Patterns

  • ADR-0068 — inbox/parked table shapes; insert in SAME txn as state change (architecture.md §2, §3.4 anti-patterns 1/4/5)
  • architecture.md §3.1 — table/reason/metric names; §3.2 — src/integration/ structure; §6.4 — park-vs-apply lives in the application handler, transition guard in entity methods
  • master-architecture.md §Messaging — outbox/DLX inherited; ADR-0036 versioned routing keys

Project Structure

  • apps/platform/trading-service/src/integration/… (see architecture.md §4.1)
  • apps/platform/trading-service/src/migrations/Migration_005_inbox_parked.ts

References

  • PRD FR-1/2/3; Gherkin "Invoice write-back"
  • libs/platform/event-contracts accounting events (payload source of truth)
  • apps/platform/inventory-service/src/stock/event-handlers/trading-event-consumer.ts (consumer pattern to mirror)

Dev Agent Record

  • Agent Model Used: claude-opus-4-8[1m]

Completion Notes

Implementation COMPLETE and behaviour PROVEN. src/integration/* consumer + handler + inbox/parked stores + Migration_005 landed; the transition method was added to the three aggregates that lacked one (two already had an equivalent); the new action was added to the activity-action enum; IntegrationModule wired into AppModule. Everything runs in ONE em.transactional (inbox insert + transition

  • status re-derivation + activity row), duplicate delivery deduped by the processed_event PK, invalid-state/unresolvable/cross-tenant events parked (never dropped/crash-looped). Handler is dependency-free and resolves its EM from a process ORM registry populated by the consumer onModuleInit (and by the Testcontainers startInfrastructure).

Verified GREEN (final, at HEAD cf49ef83):

  • All four #1625 RED files pass:
  • test/testcontainers/invoice-writeback.tc.spec.ts → 3/3.
  • test/pact/accounting-invoice-processed.consumer.pact.spec.ts → 1/1 (test:pact 9/9).
  • .../__tests__/mikro-orm-processed-event.repository.spec.ts → PASS (test:unit 517 pass).
  • test/features/invoice-write-back.feature → scenarios 1 & 2 fully green; scenario 3 green through parked with reason "INVALID_STATE", then stops at pending('009') (the acme_trading_parked_messages_total metric is task 009).
  • nx test:integration → invoice-writeback GREEN; the 10 failing files are all pre-existing other-task RED scaffolds (004/005/006/007/008) + the pre-existing #1358 tenant-isolation specs — nothing I touched regressed.
  • nx build PASS; nx test:bdd now LOADS (dry-run: 86 scenarios, no CucumberExpressionError).
  • typecheck/lint: only the 3 pre-existing missing-module errors (005/006/007) + 4 pre-existing import/no-unresolved lint errors; my changes add zero.
  • bootstrap.spec PASS — DI graph resolves, consumer connects to the harness RabbitMQ + binds acme.accounting, Migration_005 materialises both tables (20→23).

RESOLVED — the two RED-baseline harness bugs (flagged, then team-lead-verified and authorised) are fixed in a SEPARATE commit cf49ef83 (test(platform-trading #1624): …), NOT the #1625 impl commits:

  • $1/$2/$3 → ? in the tc-specs + trading.steps.ts (MikroORM conn.execute binds ?, not pg $n — empirically confirmed by the team-lead).
  • / escaped as \/ in the /api/... Cucumber Expressions in hardening.steps.ts + deal-http-gap-fills.steps.ts (a bare / = empty alternation aborts BDD load).
  • BUG 2: the line-item seed helper now creates its row in the state its scenario's Given actually describes (it was seeding the initial state one step too early).
  • The BDD seed helper find-or-creates the shared reference rows (unit, currency) rather than inserting them, so it composes with the Background's ensureReferenceData.

Commits (local, not pushed): 6c82628a (feat #1625), 0d1038e8 (test #1625), cf49ef83 (test #1624 harness remediation).

File List

Created (src):

  • apps/platform/trading-service/src/integration/integration.module.ts
  • apps/platform/trading-service/src/integration/invoice-processed.consumer.ts
  • apps/platform/trading-service/src/integration/invoice-processed.handler.ts
  • apps/platform/trading-service/src/integration/integration-orm.registry.ts
  • apps/platform/trading-service/src/integration/domain/ports/processed-event.repository.port.ts
  • apps/platform/trading-service/src/integration/domain/ports/parked-message.repository.port.ts
  • apps/platform/trading-service/src/integration/infrastructure/processed-event.entity.ts
  • apps/platform/trading-service/src/integration/infrastructure/parked-message.entity.ts
  • apps/platform/trading-service/src/integration/infrastructure/mikro-orm-processed-event.repository.ts
  • apps/platform/trading-service/src/integration/infrastructure/mikro-orm-parked-message.repository.ts
  • apps/platform/trading-service/src/migrations/Migration_005_inbox_parked.ts

Modified (src):

  • apps/platform/trading-service/src/app.module.ts (register entities + IntegrationModule)
  • apps/platform/trading-service/src/modules/deal/domain/entities/deal-activity.entity.ts (+ new activity action)
  • three aggregate entity files under apps/platform/trading-service/src/modules/*/domain/entities/ (+ the transition method)

Modified (test infra — additive, no assertion changes):

  • apps/platform/trading-service/test/testcontainers/setup.ts (register the 2 entities in the schema generator, populate the ORM registry, truncate the 2 tables)
  • apps/platform/trading-service/test/bootstrap.spec.ts (table-count 20→23 for the 2 new tables)
  • apps/platform/trading-service/test/features/step-definitions/hardening.steps.ts (implemented the task-002 invoice-write-back steps ONLY; 004–009 left as-is)

File Modification Rules

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