Thanks! Are you referring to preventing the zero insertion during import, or to adding an option to the datapoint's "purge now" box to purge points meeting specified value and date criteria?
The latter would be nice, especially since the "Discard extreme values" option is often not enabled until after invalid data has been stored in the point history. Additionally, enabling the discard function will prevent data problems from being detected and solved.
Either way, I need to find out what SQL queries to use to purge or to modify points that fall meet value and date/age criteria.
Thanks,
PM