A production rollout exposes a contract mismatch between the UI boundary and the owning service. The affected area is outbox worker.
Repair the outbox worker request stream implementation so it enforces a per-key sliding window and reports allowed and rejected requests.
Evidence
- Affected surface: Full-stack backend focus / outbox worker.
- Observed failure family: apply a sliding rate window.
- Scope policy: region must equal eu-west.