As mentioned in the article, Datomic is a database that uses Datalog as its query language:

https://docs.datomic.com/on-prem/query/query.html#why-datalo...

(Some ten years ago worked at a startup that used Datomic. It seemed to work great, although the only queries I ever needed to add to the system were simple copy-paste hacks of existing ones, so I never got to dive into Datalog.)