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fix(streaming): keep background checks from starving playback - #1065
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javi11
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November 12, 2026 07:57
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Health STAT sweeps and priority-lane import hedges could compete with active playback, producing transient failures even when articles were available. Inconclusive import checks also required manual retries.
This change runs health STATs on the background lane and waits for playback to stop before submitting each new chunk, including immediate post-import checks. Import hedges stay on the normal lane with bounded concurrency. Inconclusive fast-fail checks retry with exponential backoff up to the item's configured retry limit.
Explicit cancellation stops automatic retries and persists the cancelled status without fallback or ARR failure handling. Service shutdown leaves interrupted imports available for recovery on restart.
Regression tests reproduce the previous lane selection and verify health pause/resume, bounded retries, cancellation during backoff, and shutdown recovery. The full Go test suite and focused race-detector tests pass.
Fixes #1062.