Echo JS 0.11.0

This caching is per instance... the main issue with caching in memory, especially in something like a cloud function is functions aren't really long-lived.  It's different if you're running few instances of a persistent service, quite another if you're in a FaaS.

Depending on the round-trip-time to the query service, it may be better to not cache.  If it's expensive, then it's likely best to cache in an indexed key/value store such as redis or other local/near DB.