Make account req data migration script rerunnable (#12932)

src/client/java/teammates/client/scripts/sql/DataMigrationForAccountRequestSql.java

@@ -1,9 +1,15 @@
 package teammates.client.scripts.sql;
 
+// CHECKSTYLE.OFF:ImportOrder
 import com.googlecode.objectify.cmd.Query;
 
+import jakarta.persistence.criteria.CriteriaDelete;
+
+import teammates.common.util.HibernateUtil;
 import teammates.storage.sqlentity.AccountRequest;
 
+// CHECKSTYLE.ON:ImportOrder
+
 /**
  * Data migration class for account request entity.
  */
@@ -33,7 +39,8 @@ protected boolean isPreview() {
  */
  @Override
  protected void setMigrationCriteria() {
- // No migration criteria currently needed.
+ // Prepare clean db before migration
+ cleanAccountRequestInSql();
  }
 
  /**
@@ -73,4 +80,15 @@ protected void migrateEntity(teammates.storage.entity.AccountRequest oldEntity)
 
  saveEntityDeferred(newEntity);
  }
+
+ private void cleanAccountRequestInSql() {
+ HibernateUtil.beginTransaction();
+
+ CriteriaDelete<AccountRequest> cdAccountReq = HibernateUtil.getCriteriaBuilder()
+ .createCriteriaDelete(AccountRequest.class);
+ cdAccountReq.from(AccountRequest.class);
+ HibernateUtil.executeDelete(cdAccountReq);
+
+ HibernateUtil.commitTransaction();
+ }
 }