# KBX v19 Standard Traceability

- Business UX/AX Standard: Outbox UX, Integration Failure UX, Hangfire Job UX, Audit by Default.
- Design System: Error Recovery, Job/SignalR source-of-truth separation, Idempotency, Notification semantics.
- Implementation Contract: PostgreSQL transaction + Outbox, UI Integration Status, Idempotency, Serilog/OTel correlation, synchronous Command vs background Job.

v19 implements these as canonical Integration Definitions, attempts/receipts, bounded transient resilience, durable retry, KbxIntegrationState, and deterministic failure-injection scenarios.
