docs: def ReadCronJobRuns(self, job_id, cursor=None):
      """Reads all cron job runs for a given job id."""
      query = """
      SELECT run, UNIX_TIMESTAMP(write_time)
        FROM cron_job_runs
       WHERE job_id = %s
      """
      cursor.execute(query, [job_id])
      runs = [self._CronJobRunFromRow(row) for row in cursor.fetchall()]
      return sorted(runs, key=lambda run: run.started_at, reverse=True)