Warm caches, cool heads

Cache meetings spiral when every engineer defends their favorite TTL. We use a printed ladder: seasonal peaks on the vertical axis, TTL choices on the horizontal. The ladder forces explicit tradeoffs instead of vibes. Second, we pair each TTL with an owner and a rollback story. If the value is wrong, who flips it and how do we verify? That removes the mythical we will monitor it line without shaming anyone. Third, we timebox debates. After twenty minutes unresolved, we pick a temporary value with a scheduled review tied to real traffic data. The Cache Coherency Field Manual course builds these habits across multiple evenings so teams can sleep.