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At the root of any database interface is either DbReadBase and/or DbWriteBase. These define the methods to read and write to a database, respectively.
The SQLite database engine became an optional add-on addon plugin for Gramps 5.0 and then replaced BSDDB as the default database backend in the 5.1 version. The BSDDB engine is expected to be retired from the standard install for 5.2 release of Gramps.
The full database hierarchy is: