Thought to refresh the topic on cleaning up possibilities on:
Maybe a option that incl. deletion from the server as well, for deleting chats would be of interest (not for hidding up intention thought through, but simply for lighten store, resources and sorting things wished to carry/burden on further).
Also again reminder that many system-messages possible cause endless dirt, energy-use and burdens.
Something like periodical trashing them would be maybe useful, or producing periodical a "collected system