I’m wondering what sorts of use-cases people would use a personal key-value store for. Maybe it’s just a useful foundation for building other tools on top of, like a password manager.

For passwords specifically there's a similar tool, https://www.passwordstore.org/ - but it stores GPG-encrypted plain text files versioned with git, instead of managing a sqlite db

More importantly, it has Firefox and Chrome extensions for auto-filling passwords on the web https://github.com/passff/passff https://github.com/browserpass/browserpass-extension