At #LCA2020 #LumoSQL was presented, which picks up the pieces of #SQLite4 and #SQLightning and combines #SQLite with #LMDB :

https://lumosql.org/

The talk goes into background, software archaeology and some technical details both.on.how the source code is managed and how the software works:

https://invidious.snopyta.org/watch?v=ukktq_79Z6Q
https://www.youtube.com/watch?v=ukktq_79Z6Q

@clacke