Consider SQLite

I use SQLite to power up lots of stuff I'm working on. It's lightweight, fast, simple and well-documented for small projects — like a Postgres but very local. Saves me from having to deal with containers "just to store data", let alone for moving stuff to other machine where I would also need the permissions to configure and run containers in the first place; whereas all you need to pass SQLite databases along is scp / rsync.