refactor: work on search

src/database/key_value/room/metadata.rs

@@ -1,16 +0,0 @@
-impl service::room::metadata::Data for KeyValueDatabase {
-    fn exists(&self, room_id: &RoomId) -> Result<bool> {
-        let prefix = match self.get_shortroomid(room_id)? {
-            Some(b) => b.to_be_bytes().to_vec(),
-            None => return Ok(false),
-        };
-
-        // Look for PDUs in that room.
-        Ok(self
-            .pduid_pdu
-            .iter_from(&prefix, false)
-            .next()
-            .filter(|(k, _)| k.starts_with(&prefix))
-            .is_some())
-    }
-}