docs: def remove_old_tmp_files(profiles=None, max_lifetime=(7 * 24)):
      """
      Removes old temp files that is older than expiration_hours.
      If profiles is None then will be use all profiles.
      """
      assert isinstance(profiles, (list, tuple)) or profiles is None
      if profiles is None:
          profiles = dju_settings.DJU_IMG_UPLOAD_PROFILES.keys()
      profiles = set(('default',) + tuple(profiles))
      total = removed = 0
      old_dt = datetime.datetime.utcnow() - datetime.timedelta(hours=max_lifetime)
      for profile in profiles:
          conf = get_profile_configs(profile=profile)
          root_path = os.path.join(settings.MEDIA_ROOT, dju_settings.DJU_IMG_UPLOAD_SUBDIR, conf['PATH'])
          for file_path in get_files_recursive(root_path):
              m = re_tmp.match(os.path.basename(file_path))
              if m is None:
                  continue
              total += 1
              fdt = dtstr_to_datetime(m.group('dtstr'))
              if fdt and old_dt > fdt:
                  os.remove(file_path)
                  removed += 1
      return removed, total