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Explains a practical debugging path across browser, Next.js layer, API, logs, database, and deployment changes.
Explains compatible full-stack deployment, backend enforcement, staged rollout, telemetry, safe disablement, rollback decisions, and flag cleanup.
Explains tracing one user action across browser, frontend server, API, dependencies, logs, metrics, and safe diagnostics.
Explains how to choose an E2E flow, control test data, avoid brittleness, and cover frontend/API integration risk.