grabowski
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These endpoints ran an uncached latest-per-station aggregation on every request (p50 0.6-0.9s under load, ~30% of the traffic mix) for data the collector refreshes hourly. Responses are now cached per (feed, hours) for HII_CACHE_TTL_SECONDS (default 120) with a per-feed compute lock so a cache miss runs one query regardless of concurrency; empty results are never cached so recovery is immediate. Cached hits measure ~8ms. Cache is process-local behind a single helper — the seam where a shared backend (Redis) would slot in if the deployment ever moves to multiple workers; not warranted at one.