restart

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 460
      def restart
        return unless materialized?

        @instrumenter.finish(:restart)

        if connection.supports_restart_db_transaction?
          @instrumenter.start
          connection.restart_db_transaction
        else
          connection.rollback_db_transaction
          materialize!
        end
      end