Most useful databases persist their data somewhere, what does "persistent" mean in this context? Given the reference to Datomic I assume it means "persistent over time" aka you can time-travel through the DB history. Or is it just the classic meaning of persistent aka "not ephemeral"?

I think it's the classical meaning to distinguish it from Datascript, which is in-memory. This is sqlite as a storage back end I think.

I wonder if it also supports the recursive parts of datalog.

Datalog IS the recursive parts. Everything else is just conjunctive queries.

From a quick look at the code I believe they are using sqlite.

Absolutely great idea. Datomic is amazing but having something light weight and open source would be fantastic.

This is really cool, just wish it were more obvious on how to make an FFI layer for other languages

Cool! Can it hook up with .Net core eventually?

Any example code? (in Rust?)