Solved it by running a script that edits the value. This script uses sqlite3 to edit the wrong value at 00:00. Tested and works fine. Case Closed.

I have a script that calculates the costs of power and gas consumption. The problem is it set the highest value at 00:00 hour. See screendump. That will result in a Dashticz Graph that shows this value at the next day. See screendump graph1. The top bars are consumption and the bottom two are the ...