tweaks

        h.set("CREATED", self.pipeline_id, comment="pipeline build time")

        return reformat_header(h, strip=False, comment="Pipeline summary")

    def summary(self):

    def summarize(self):

        """Summarize this run."""

        t_stop: Time = Time.now()

        t_cost: float = (t_stop - self.t_start).value * 86400.0

        self.pipeline_logger.info(f"Total cost: {t_cost} sec")

        self.pipeline_logger.info(f"Total cost: {t_cost:.1f} sec")

    def clean_output(self):

        """Clean output directory."""

            for d in dlist:

                f.write(self.dict2msg(d) + "\n")

    def preview(self, dlist: list[dict]) -> str:

        """Preview messages."""

    def preview(self, dlist: list[dict], n: int = 10) -> None:

        """Preview top `n` messages."""

        s = ""

        for d in dlist:

        for d in dlist[:n]:

            s += self.dict2msg(d) + "\n"

        print(s)