Datalog is also used as query language for Datomic
No it's not. The query language of Datomic, and that taught on learndatalogtoday.com, is a Datomic-proprietary language similar to Prolog-in-LISP implementations or frame-based expert systems of old.
There is datascript, which has a foss implementation of datascript (with nice performance)
https://github.com/tonsky/datascript And this (deprecated) project, that translate datalog to SQL(lite) https://github.com/mozilla/mentat