Tvheadend

Hi,
I have done a mistake. after scanning Astra 19,2 I have pushed the button 'Map All' on Services tab. Now I have 1541 channels. I have entered a channel number to a few of these channels. Is there an easy way to disable all other channels? I am missing a button 'activate/deactivate all' on Channel config tab. It would be easier to deactivate all and then activate just some.
how are they stored?

thanks a lot