Tvheadend

Approximate a month my provider changes it's bouquet (fastscan list), usually channels are changed from frequency or symbol rate is changed etc.
Normally channel numbers and names stay the same.

Updates are processed fine, I don't have to do anything when for example the mux for channel "VTM HD" changes.
The channel stays at number 3 and the frequency gets updated automatically.

Now the problem, when channels are updated, old channels are placed on the end of the channel list..
i.e. 'VTM HD' is now available on channel 3 as it should and on the and of the list at number 960.
The one on the end is not working as it contains the old service.
After some time I end up with hundreds of non working channels on number 960..

Is it possible to just update the channel and not create a new one?
In this way the channel id would stay the same and we don't have these duplicates.
We can do this if the channel name and channel number in the bouquet stay the same?