Oddbean new post about login | logout I don't know if I follow? Can't you just send each as a separate event?
You could but if a big stack of DMs goes to a large relay they can rate limit or block, as it can look like spam. cc: npub1ymt2j3n8tesrlr0yhaheem6yyqmmwrr7actslurw6annls6vnrcslapxnz