A production rollout exposes a contract mismatch between the UI boundary and the owning service. The affected area is API transaction.
Repair the API transaction dependency protection implementation so it opens only after the failure threshold and calculates a deterministic retry time.
Evidence
- Affected surface: Full-stack backend focus / API transaction.
- Observed failure family: calculate circuit-breaker state.
- Scope policy: tenantId must equal tenant-primary.