> > How can i drop a user as SUPERUSER (!) with all privileges?
>
> I believe you will need to REVOKE ALL ON SCHEMA public FROM ak02.
doesn't help:
-bash-4.1$ psql -U postgres db115150
psql (9.1.8)
Type "help" for help.
db115150=3D# begin;
BEGIN
db115150=3D# revoke all on schema public from ak02;
REVOKE
db115150=3D# drop user ak02;
FEHLER: kann Rolle =C2=BBak02=C2=AB nicht l=C3=B6schen, weil andere Objekt=
e davon abh=C3=A4ngen
DETAIL: Privilegien f=C3=BCr Schema public
db115150=3D#