This is very cool! It's really awesome to see this code as data concept gaining a lot of traction recently. Hope to see this project developed further.

I'm working on a similar project here: https://sourcescape.io/, but intended for use outside the IDE on larger collections of code (like the codebase of a large company.)

Agreed on the Prolog/Datalog approach of expressing a query as a collection of facts. CodeQL does the same. From one datastore nerd to another, I actually think this is a relatively unexplored area of querying knowledge graphs (code being a very complex, dense knowledge graph.)

Very excited to see where you go next with this "percolate search" functionality in the IDE.