Open-source fork of SQLite maintained by Turso. Ships an official Ruby adapter (ruby-libsql) and an 'embedded replicas' feature that replicates a SQLite database across multiple nodes, transparently forwarding writes to the primary and guaranteeing read-your-writes. Turso's managed cloud service built on libSQL recently announced syncing databases to AWS S3 Express. Wrona cites libSQL as the option when vertical scaling on one node isn't enough, though his team hasn't used it yet.