How about partial backlogs? Like say I could "subscribe" to certain keywords (upto a max limit if that's necessary, say 10) and the server will store all messag

How about partial backlogs? Like say I could "subscribe" to certain keywords (upto a max limit if that's necessary, say 10) and the server will store all messages containing those words or my username. If I need more context about those messages when I return, I can just ask those users (or a bot).