In 2020, I got really interested in Datalog implemenations after reading Pete Vilter's Codebase as Database: Turning the IDE Inside Out with Datalog. I did a bunch of reading about different ways to make a Datalog.

Eventually Jamie Brandon advised me to make a miniature relational database and lower (raise?) the datalog layer to it. That approach got me way further than I had gotten before! It ended up being released to the public (though not on the Elm package site) as bad-datalog, which you can play with at

I'm really glad I did this project; I learned a lot about the things that databases have to do to plan and execute a query, and got some experience with a fun relational language in the bargain.