# RowVersion Multi-Agregado — Design

**Fase:** 0 — Gate #9

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## Agregados

| Agregado | Coluna | Comportamento |
|----------|--------|---------------|
| WorkOrder | `RowVersion` rowversion | Bump em mutação WO (schedule, status, assignment) |
| Dispatch | `RowVersion` rowversion | Bump em mutação vendor/checklist/signoff |

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## HTTP 409

`ConcurrencyExceptionFilter` captura `DbUpdateConcurrencyException` e retorna:

```json
{
  "status": "Conflict",
  "message": "The record was modified by another user. Refresh and retry.",
  "code": 409
}
```

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## Regras (Fase 2 testes completos)

- SHOC edita ScheduledDate → bump WO.RowVersion
- SHOC edita vendor → bump Dispatch.RowVersion
- Vendor edita checklist → bump Dispatch.RowVersion only

Testes de concorrência paralela: Fase 2 (`Concurrency integration tests` backlog #27).