It looks like you possibly have an issue with the tag quality (
dataintegrity column) changing which will trigger a historical write. Since you have 10 seconds minimum between samples it is impossible to say for sure. But my guess is somewhere in the 10 seconds after the previous write, the tag quality changes to something other than 192 (aka “Good”) but doesn’t write to the DB due to your minimum time between samples. Then at some point after it has surpassed the 10 second minimum, the quality changes again but triggers a write to the DB this time.
You could probably get a better picture of what is happening with that tag if you reduce the minimum time between samples to 0 and see what values you get.
Edit: It could also be the value changing and not writing to the DB if it’s within that 10 second minimum between samples.