Is migration from other chat apps supported?

We have some archived channels but having all the history is mandatory because active channels have A LOT for search plus validate our previous actions and shows transparency and our growing from the scratch.

What’s the point on erasing data when is valuable (we don’t have trash chats, but productive)?

Sorry but I don’t get that. I understand you start from ‘all chat is trash’ as premise, that’s false in our community.

Could be the majority, but not all of the cases. Importer would take care about specific cases, not all of them (that probably don’t use Discourse).