Rather than just permanently delete messages, it would be fantastic if you could archive messages. This was one of the features in Google Hangouts that I used the most and found incredibly helpful.

Sometimes you want to clean up your inbox so you don't have hundreds of conversations floating around in it that you have to scroll through, but you don't necessarily want to lose some conversations forever by deleting them. The ability to Archive conversations in order to move them out of the main inbox view and into a separate archive view for later reference or search would be perfect here, and I believe would appeal to many users.

See the Google Hangouts app for more details on how this could and should work. Would love to see it in Textra! It would make it truly stand apart from the competition!