In 9.3 super user can cancel all queries or user can cancel own sessions.
Is possible enhance this possibility to database owners? So owner can cancel or can terminate sessions related to owned databases?
But this means that a db owner could cancel superuser's super important database query. Maybe let's make a default that the owner can cancel all queries except for superuser's ones. And additionaly a special right that superuser can grant it to the db owner, so the owner can cancel even superuser's queries?
