pub fn room_by_dm_pair_key(
conn: &Connection,
pair_key: &str,
) -> Result<Option<Room>>Expand description
The room currently holding pair_key as its dm_pair_key, if any — the
binary crate’s routes::matrix::rooms::create_room’s DM-reuse lookup
(plan P5 correction: “a second DM between the same pair returns the
existing room id only if it is still a live DM for both”).