Delete entries (over 47.000)

Hi, I’ve been using Flamingo for a while but now I have several channels and a total of over 47.000 entries.

Hoe can I delete those? It would be easiest to delete them by channel.

Deleting them from the dashboard is too much work, my site crashes when I want to delete more than 500 entries. And you can image deleting 200 entries at a time takes a lot of time.

I need to delete them because of the GDPR law and also because my database is becoming huge. When I delete a form in contact7, the channel in Flamingo is still there without any possibility to delete it.

There must be a simple way to do this?