code: def configure_engine(self):
          
          try:
              self.connection.execution_options(isolation_level="SERIALIZABLE")
          except sa.exc.ArgumentError:
              LOG.debug("Unable to set isolation level to SERIALIZABLE")
          return True
docs: Configure the databse connection.
  
          Sets appropriate transaction isolation levels and handle errors.
  
          Returns:
              True, if we did not encounter any unrecoverable errors, else False.