docs: def revoke_all(cls, cur, schema_name, roles):
          """
          Revoke all privileges from schema, tables, sequences and functions for a specific role
          """
          cur.execute('REVOKE ALL ON SCHEMA {0} FROM {1};'
                      'REVOKE ALL ON ALL TABLES IN SCHEMA {0} FROM {1};'
                      'REVOKE ALL ON ALL SEQUENCES IN SCHEMA {0} FROM {1};'
                      'REVOKE ALL ON ALL FUNCTIONS IN SCHEMA {0} FROM {1};'.format(schema_name, roles))