For those who may have missed it, Mozilla is working on Datalog knowledge store backed by SQLite called Project Mentat [1] (also written in Rust).
Announcement and rationale written by one of its devs can be found here [2].
Also previous HN discussion is located here [3].
[1] https://github.com/mozilla/mentat
[2] https://medium.com/project-tofino/introducing-datomish-a-fle...