docs: def grant_usage_install_privileges(cls, cur, schema_name, roles):
          """
          Sets search path
          """
          cur.execute('GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA {0} TO {1};'
                      'GRANT EXECUTE ON ALL FUNCTIONS IN SCHEMA {0} TO {1};'
                      'GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA {0} TO {1};'
                      .format(schema_name, roles))