Golang's package manager has a rather elegant shared checksum database (a merkle tree), making it easy to trust mirrors:
miniblog.
Related Posts
Effects and code as a database in Unison: https://jaredforsyth.com/posts/whats-cool-about-unison/
Unison is looking at changing their program representation to plain sqlite!
When someone says "you should use the cloud", I'm never sure if they mean:
1: use a virtual server rather than running your own hardware, or
2: use hosted services rather than running your own e.g. database
2 is often surprisingly expensive IME.
On the remarkable inertia of database and programming language choices early in the life of a company: