Nice writeup..

Tip: instead of delaying every request with a potential 400ms coldfetch to KV and esp. incurring costs for KV reads, why not use the secrets API to set an environment variable (that it's a secret is secondary, for some reason there is no normal envir. variable set API) and then get the data instant/free from there? usually takes 2-30 seconds for the update to propagate, uses Quicksilver internally