How to delete devices graphs and datasource from cacti

[Nadou21]

Hello everyone,

I'm trying to delete like 500 devices from cacti and also their corresponding graphs and datasource. I know if I delete the device from the database the graphs will still exist and I think it has something to do with the RRA directory. I don't want to use the GUI interface because I have many devices so I'm doing it from CLI.
Does anyone have an idea how to achieve that.
Thank's