The whole handling of the database and configuration file is entire on dbconfig's side, all XWiki does is triggering it with a few parameters (like the location of the configuration file).
That being said, if you don't want to use dbconfig, there is honestly not much point in using xwiki-pgsql-common (its only point is to have a dependency on xwiki-commons and postgresql and run dbconfig with a template of the hibernate configuration). It would probably be much simpler (and apparently safer) to use xwiki-common instead.
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