Joedb is the Journal-Only Embedded Database. Its purpose is to allow crash-safe manipulation of data stored in permanent storage. Data is manipulated directly in the target programming language, without using SQL: a compiler produces native type-safe data-manipulation code from the database schema. The data is stored in permanent storage as a journal of all modifications. This way, the whole data history is remembered, and it is possible to re-create any past state of the database. It is also a way to make the system extremely simple, and fast.
For more information, please take at a look at the documentation https://www.remi-coulom.fr/joedb/intro.html.