refactor(migration): simplify setting name migrations with direct UPDATE statements

Author: poikilotherm

src/main/resources/db/migration/V6.8.0.1.sql

@@ -79,22 +79,10 @@ DO $$
     END $$;
 
 -- 2. Migrate BuiltinUsers.KEY to the new setting name
-DO $$
-    BEGIN
-        IF EXISTS (SELECT 1 FROM setting WHERE name = 'BuiltinUsers.KEY') THEN
-            INSERT INTO setting (name, lang, content) VALUES (':BuiltinUsersKey', NULL, (SELECT content FROM setting WHERE name = 'BuiltinUsers.KEY'));
-            DELETE FROM setting WHERE name = 'BuiltinUsers.KEY';
-        END IF;
-    END $$;
+UPDATE setting SET name = ':BuiltinUsersKey' WHERE name = 'BuiltinUsers.KEY';
 
 -- 3. Migrate WorkflowsAdmin#IP_WHITELIST_KEY to the new setting name
-DO $$
-    BEGIN
-        IF EXISTS (SELECT 1 FROM setting WHERE name = 'WorkflowsAdmin#IP_WHITELIST_KEY') THEN
-            INSERT INTO setting (name, lang, content) VALUES (':WorkflowsAdminIpWhitelist', NULL, (SELECT content FROM setting WHERE name = 'WorkflowsAdmin#IP_WHITELIST_KEY'));
-            DELETE FROM setting WHERE name = 'WorkflowsAdmin#IP_WHITELIST_KEY';
-        END IF;
-    END $$;
+UPDATE setting SET name = ':WorkflowsAdminIpWhitelist' WHERE name = 'WorkflowsAdmin#IP_WHITELIST_KEY';
 
 -- 4. Migrate WorkflowServiceBean.WorkflowId specials to new PrePublishDatasetWorkflowId and PostPublishDatasetWorkflowId
 UPDATE setting SET name = ':PrePublishDatasetWorkflowId' WHERE name = 'WorkflowServiceBean.WorkflowId:PrePublishDataset';