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The aim of Hibernate Envers is to provide historical versioning of your application's entity data. Much like source control management tools such as Subversion or Git, Hibernate Envers manages a notion of revisions if your application data through the use of audit tables. Each transaction relates to one global revision number which can be used to identify groups of changes (much like a change set in source control). As the revisions are global, having a revision number, you can query for various entities at that revision, retrieving a (partial) view of the database at that revision. You can find a revision number having a date, and the other way round, you can get the date at which a revision was committed.