[Fix] User deletion & migration

src/rho/rho_manager.rs

@@ -66,7 +66,11 @@ impl RhoManager {
             )
             .await;
 
+        let replacement = user_ids.iter().copied().collect::<std::collections::HashSet<_>>();
         for user_id in previous_users {
+            if !replacement.contains(&user_id) {
+                rho.detach_user_clients(user_id).await;
+            }
             if self
                 .users
                 .get(&user_id)