Modern database and filesystems make pervasive use of

B-trees, which are tree
structures optimized for storing sorted lists of keys and values on block devices.

Dolt is an Apache 2.0-licensed project that makes clever use of a
variant of a B-tree to support efficient version control for an entire database.
The data structure it uses could well be of interest to other projects.

https://lwn.net/Articles/1068864/
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