Function migrate_conduit_knocks 

pub(super) async fn migrate_conduit_knocks(services: &Services) -> Result

Imports Conduit’s pending knocks. Conduit names the columns roomuserid_knockcount / userroomid_knockstate; tuwunel renamed them to *knocked* but kept the byte layout (room_id 0xff user_id -> u64 count; user_id 0xff room_id -> JSON stripped state), so each row copies verbatim. Imported once: tuwunel clears a knock on the user’s join or leave, so a re-import would resurrect a knock the user has already resolved.