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