Comment 4 for bug 1751279

per-relation configuration may be a solution, which has been discussed in the past. If the operator could 'juju relation-set postgresql db:0 dbuser=foo', we would have a standard mechanism for charms to use to allow operators to assign an identity to a remote charm. TBH I'm not sure if this is a major UX improvement over adding an action to do the same thing (juju run-action --wait --leader postgresql set-dbuser relation=db:0 user=foo)