reset!

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 370
      def reset!
        @lock.synchronize do
          return connect! unless @raw_connection

          unless @raw_connection.transaction_status == ::PG::PQTRANS_IDLE
            @raw_connection.query "ROLLBACK"
          end
          @raw_connection.query "DISCARD ALL"

          super
        end
      end