Fintech Cohort Metrics: Hosted Query API Evidence for React via Node.js

Implementing Node.js feature flags for SaaS requires append-only release-evidence records to ensure rollback safety, as Infrai lacks built-in audit logs. Developers should use deterministic account assignment and poll for configuration changes. Similarly, fintech cohort metrics require a Node.js boundary between React and hosted query APIs. Services must provide bounded, tenant-safe time series with stable labels. A service is accepted only if the backend can issue range queries per card and retain experiment definitions beside telemetry.