Trend clean

[domotiqa]

Hi,
I hae majority of my project, where I need to setup LM before all counter are installed (modbus, powertag....).
And when electrician installe it, I have my total script for category for example that 'got a peak.
   

So I have this kind of curve. I often export in xml, then re-import in the backup with the trend ID, but it's such a pain.

I was thinking to option:
1- reset the trend file to a blank one by script
2- I would prefer to create a script that monitor all my curve and if value goes above a certain max I setup, it clear it from the rdd file.
I don't know where to start to modifiy a value, is there existing base script I could modify ?

I would definitiv prefer second option.

Regards