Invalidate data / graph only from specific date on


i have three querys A B and C. Two of them (B, C) are gathered since some days but I am only interested in the sum of all three.

In my case the sum makes no sense, if there is data of all three of them present (A;B;C >0). How can I handle that.

I colsulate the sum via transormation. It would be possible to invalidate all data from a given timstamp and backwards if possible.