when removing duplicates leave one copy

persist/src/main/resources/db/migration/14.0.0~alpha.0/V14.0.0.20190618__new_permission_model.sql

@@ -90,7 +90,7 @@ delete from privilege_table where type = 'VIEW_PROJECT'
                                or type = 'MANAGE_PLUGINS';
 
 delete from user_privilege_map_table t1 using user_privilege_map_table t2
-where t1.CTID != t2.CTID
+where t1.CTID < t2.CTID
   and t1.user_id = t2.user_id
   and t1.privilege_id = t2.privilege_id;