njnu-seafish commented on code in PR #18549:
URL: 
https://github.com/apache/dolphinscheduler/pull/18549#discussion_r4045514982


##########
dolphinscheduler-dao/src/main/resources/sql/upgrade/3.5.0_schema/postgresql/dolphinscheduler_ddl.sql:
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@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+*/
+
+-- Enforce idempotent task-result alerts at the database level.
+-- Allows INSERT IGNORE (MySQL) / ON CONFLICT DO NOTHING (PostgreSQL) to 
atomically
+-- prevent duplicates without check-then-insert race conditions.
+-- Clean up any existing duplicate rows before adding the unique constraint.

Review Comment:
   > You should check for yourself to avoid invalid comments generated by AI.
   
   sorry, it have been simplified to a single line.



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