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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Reviewing versioned backups
Date: Wed, 24 Mar 2021 18:53:40 +0200
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In-Reply-To: <YFr8rd5wSieknf3Y@protected.localdomain> (message from Jean Louis
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> Date: Wed, 24 Mar 2021 11:47:41 +0300
> From: Jean Louis <bugs@gnu.support>
> Cc: help-gnu-emacs@gnu.org
> 
> I am using database backed versioning, what would be the method or
> approach to hook it into the standard Emacs versioning system?

You will have to write a VC back-end, by implementing the relevant
operations that make sense for such a "version control".  See
vc-hooks.el and vc.el.

This discussion is better taken to emacs-devel, btw.