yyqdbngt opened a new pull request, #3842:
URL: https://github.com/apache/rocketmq-dashboard/pull/3842

   ### Motivation
   
   The existing `MybatisPlusAlertCollectionLeaseTest` covers `renew` outcomes 
only. The three `tryAcquire` paths — direct acquire success, insert fallback 
and duplicate-key lease loss — were untested.
   
   ### Changes
   
   - `tryAcquireSucceedsThroughTheMapperAcquirePath`: a successful conditional 
acquire returns true without any insert.
   - `tryAcquireFallsBackToInsertWhenAcquireMisses`: when the conditional 
acquire misses, an insert of the lease record grants the lease.
   - `tryAcquireTreatsDuplicateInsertAsLeaseLoss`: a duplicate-key insert 
failure is reported as lease loss rather than an error.
   
   ### Verification
   
   ```
   mvn -B test -Dtest=MybatisPlusAlertCollectionLeaseTest
   [INFO] Tests run: 5, Failures: 0, Errors: 0, Skipped: 0
   [INFO] BUILD SUCCESS
   ```


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