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 cache lifecycle implementation so it separates purge, refresh, and escalation actions by staleness and risk.
Evidence
- Affected surface: Full-stack backend focus / outbox worker.
- Observed failure family: plan cache invalidation.
- Scope policy: region must equal eu-west.