btlqql opened a new issue, #1044:
URL: https://github.com/apache/rocketmq-dashboard/issues/1044

   ## Problem
   
   `RocketMQAdminClientImpl` persists topic/group metadata keyed by 
`(cluster_id, name)`, but four operations scope their DB queries by `name` 
alone:
   
   - `createTopic` / `updateTopic` read the existing perm with 
`selectOne(...eq(RmqTopic::getName, topicName))`. When the same topic name 
exists in more than one cluster (a common multi-cluster mirror setup), 
MyBatis-Plus throws `TooManyResultsException`, which the outer catch turns into 
a generic 500 "Failed to create/update topic".
   - `deleteTopic` removes the DB row with `delete(...eq(RmqTopic::getName, 
name))` — it deletes **every cluster's** row for that name, not just the 
current cluster's. Deleting a topic in cluster A silently removes cluster B's 
metadata.
   - `deleteConsumerGroup` does the same for `RmqGroup`.
   
   The create path already demonstrates the correct scope: it queries by 
`(clusterId, name)` before inserting (see the `selectOne` guarding the unique 
key).
   
   ## Expected
   
   All four operations scope their DB access by the current cluster, matching 
the `(cluster_id, name)` primary key.
   
   ## Acceptance criteria
   
   - `createTopic` / `updateTopic` no longer throw when the same topic name 
exists in another cluster.
   - `deleteTopic` deletes only the current cluster's topic row.
   - `deleteConsumerGroup` deletes only the current cluster's group row.
   - Unit tests cover the same-name-different-cluster path for 
create/update/delete.


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