Seonglae Chohctree
HC-tree Links: ...Hctree Test Results ...Hctree Design Documentation ...Hctree File Format... SQLite is sometimes used as the core of a client/server database system. While it works reliably well in such cases, the database backend module that it uses to store b-tree structures in its database file was not designed with this case in mind and can be improved upon in several ways.
https://sqlite.org/hctree/doc/hctree/doc/hctree/index.html
HC-tree is an experimental high-concurrency database back end for SQLite | Hacker News
Personally I want the opposite direction, a sort of Postgres-lite that uses a single flat file and lives inside a lib, for things where the power of the full thing isn't needed yet but I want to design my backend code against a Postgres interface.
https://news.ycombinator.com/item?id=34434025