update by site rather than timeseries and use the oldest last_refresh timestamp of the values themselves for lastModified rather than abusing timeseries.last_refreshed and site.last_refreshed
update by site rather than timeseries and use the oldest last_refresh
timestamp of the values themselves for lastModified rather than
abusing timeseries.last_refreshed and site.last_refreshed

ulmo-dev/ulmo-common