Since it recently came up in https://tracker.pureos.net/T1048 and also affects https://tracker.pureos.net/T1011 and https://tracker.pureos.net/T1012 I'd like to start a discussion on what the "right" way of doing updates should look like.
Currently there seem to be two different strategies (from what I can see)
a ) merging debian tags, which will result in intertwined changelog entries which might be undesirable
b) rebasing on new debian versions as described https://source.puri.sm/pureos/packages/firefox-esr/-/blob/pureos/esr60/master/debian/README.source
I personally don't have any real preference and wasn't even aware of way b) until @jonas.smedegaard pointed it out to me.
When some common ground has been found it would be good to document what is deemed the best practice and/or provide scripts to automate the involved tasks to make it frictionless.