yyqdbngt opened a new pull request, #2057:
URL: https://github.com/apache/rocketmq-dashboard/pull/2057

   ## What is the purpose of the change
   
   Fix #2006.
   
   AclService.updateUser loaded an existing ACL user, merged editable fields 
while preserving credentials, and called AclRepository.saveUser. The MyBatis 
implementation of saveUser performs a second existence check and inserts when 
the row is absent. If a delete request removed the user after updateUser read 
it, saveUser re-created the deleted user with the stale credentials.
   
   ## Brief changelog
   
   - AclRepository: add replaceUser that updates an existing user without ever 
inserting a missing one (mirrors replaceRule)
   - MybatisPlusAclRepository: implement replaceUser using the existing row's 
createdAt
   - AclService.updateUser: use replaceUser and return 404 when the user no 
longer exists
   
   ## How was this patch verified
   
   - Code review: matches the existing replaceRule pattern used for concurrent 
rule updates
   - `git diff --check` clean
   


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