basically just need to do inbox/outbox? then there's still some issues with relays relations and auth extra selects but may actually work again
"hot" joins will use internal ids (relations, like/share, addressing) while "slow" relations will use full ap ids (attributed to, context, user configs)
sorry! your db is now useless (: you weren't using upub in production, were you?? brb gonna migrate 50k posts from test db...