@mint @p @NonPlayableClown @fba
I can definitely cook up a beating a dead horse winrar list if there's some interest. First impression tells me that we would need an api to fedilist that asks if an instance is dead, and if so, since when. Then every time you record a block you make sure you know whether the blocked instance is alive or dead at the time of the block according to fedilist, and update your database accordingly if you have no data. Probably need some contingencies for resurrection (fba-side), and a minimum time after which someone is dead (fedilist side), and some caching for live instances to make sure fedilist isn't hammered with queries about if poast is dead yet (fba-side). After that the query is simple. It's intelligently ascertaining the information and keeping it in sync that's a bit weird but not impossible.