grabowski
731f10910e
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Third on-box run: p50s healthy everywhere but tails at 60s — when a TTL expired under load, every concurrent miss parked an executor thread on the single-flight lock, exhausting the ~12-thread pool and timing out unrelated endpoints. All cached endpoints (latest, HII, stats, health) now use _cached_swr: fresh -> inline; expired-but-present -> the stale value is returned immediately and ONE background task refreshes; only a cold key (first request since startup) waits. Plus: dedicated ThreadPoolExecutor (EXECUTOR_THREADS, default 48) replaces the cpu+4 default, and DatabaseHealthCheck no longer re-runs the CREATE TABLE DDL suite on every probe (connect only when no live engine).