Node.js Backend API Feature Flags Govern Nightly Parser Percentage Rollout

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Put the new structured-log parser behind server-owned Node.js feature flags, let the backend API assign players to a stable percentage rollout, and promote the parser only when search signal improves without exhausting the pipeline's error budget. The percentage is merely an exposure control; the release decision belongs to the quality evidence from a complete nightly run. TL;DR: keep flag administration on the backend, return only an evaluated value to the application, and let the frontend poll that narrow application endpoint. A basic flags API is enough for this job when polling latency is

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