> @sa_userconf_maps = ({ '.*' => 'sql:' });
The left-hand-side is not a regex in a hash lookup.
> @sa_username_maps = new_RE ( [ '.*' => '$GLOBAL' ] );
If you want static lookup results, use these:
> @sa_userconf_maps = 'sql:';
> @sa_username_maps = '$GLOBAL';