Synopsis

ALTER USER role_specification [ WITH ] option [ ... ]

donde option puede ser:

      SUPERUSER | NOSUPERUSER
    | CREATEROLE | NOCREATEROLE
    | CREATEDB | NOCREATEDB
    | INHERIT | NOINHERIT
    | LOGIN | NOLOGIN
    | REPLICATION | NOREPLICATION
    | BYPASSRLS | NOBYPASSRLS
    | CONNECTION LIMIT connlimit
    | [ ENCRYPTED ] PASSWORD 'password' | PASSWORD NULL
    | VALID UNTIL 'timestamp'

ALTER USER name RENAME TO new_name

ALTER USER { role_specification | ALL } [ IN DATABASE database_name ] SET configuration_parameter { TO | = } { value | DEFAULT }
ALTER USER { role_specification | ALL } [ IN DATABASE database_name ] SET configuration_parameter FROM CURRENT
ALTER USER { role_specification | ALL } [ IN DATABASE database_name ] RESET configuration_parameter
ALTER USER { role_specification | ALL } [ IN DATABASE database_name ] RESET ALL

donde role_specification puede ser:

    role_name
  | CURRENT_ROLE
  | CURRENT_USER
  | SESSION_USER