@Gargron this makes me wonder two things:

1. If some activity past that date is referenced again (say, boosted), or is specifically requested by a user (say, by URL), would it be fetched and stored again? Or does that mean an instance with that enabled will not work with anything beyond that date
2. As long as we're talking about sizes, is there any way to deal with cached account headers? That seems to be the biggest folder here by far, nothing I know in tootctl touches it.