fixup! perf(knock): add database cache

iterate over all users in migration

src/database/mod.rs

@@ -949,18 +949,7 @@ impl KeyValueDatabase {
             }
 
             if services().globals.database_version()? < 14 {
-                for username in services().users.list_local_users()? {
+                for user in services().users.iter().filter_map(Result::ok) {
-                    let user = match UserId::parse_with_server_name(
-                        username.clone(),
-                        services().globals.server_name(),
-                    ) {
-                        Ok(u) => u,
-                        Err(e) => {
-                            warn!("Invalid username {username}: {e}");
-                            continue;
-                        }
-                    };
-
                     for room in
                         services()
                             .rooms