I have a script that writes to another external database every ten minutes.
I found that out of around 2000 tags, there are 15 or so that always return a value, even when there has been no new value logged during the last ten minutes asked for.
If I look at the current sqlt_data
table I can see that there is no new value for that last ten minutes. The tag is part of a UDT and looking at a similar tag in the same tag folder, no value is found.
I forced all tags to log a value, tag 1 and tag 3 both had a value logged at 17:32.30. The external database for tag 1 will get only that last value from 17:32.30 and no other values but tag 3 had the same value at 17:32.30 and a value every 10 minutes.
Read back from external database.