def make_readings_hist(cls, recs):
# extend readings by additional info
# return list of HistReadingsRecords
readings_hist_lst = []
for r in recs:
# status_temp, status_atmo, status_group = cls.get_reading_statuses(r.meter_id, r.temperature, atmo_temp)
readings_hist_lst.append(
Db.HistReadingsRecord(
r.dtime, r.dtime_sec, r.meter_id, r.image_id,
r.temperature, None,
None)) # equip_dtime, equip_dtime_sec to be updated
equip_dtime = min([r.dtime for r in readings_hist_lst])
equip_dtime_sec = min([r.dtime_sec for r in readings_hist_lst])
logger.debug(f'len(readings_hist_lst={len(readings_hist_lst)})')
return readings_hist_lst, equip_dtime, equip_dtime_sec
