add ParentId to Groups, bump version

db/zm_create.sql.in

@@ -264,6 +264,7 @@ DROP TABLE IF EXISTS `Groups`;
 CREATE TABLE `Groups` (
   `Id` int(10) unsigned NOT NULL auto_increment,
   `Name` varchar(64) NOT NULL default '',
+  `ParentId` int(10) unsigned,
   `MonitorIds` tinytext NOT NULL,
   PRIMARY KEY (`Id`)
 ) ENGINE=@ZM_MYSQL_ENGINE@;

db/zm_update-1.31.5.sql

@@ -0,0 +1,17 @@
+--
+-- Add StorageId column to Monitors
+--
+
+SET @s = (SELECT IF(
+    (SELECT COUNT(*)
+    FROM INFORMATION_SCHEMA.COLUMNS
+    WHERE table_name = 'Groups'
+    AND table_schema = DATABASE()
+    AND column_name = 'ParentId'
+    ) > 0,
+"SELECT 'Column GroupId exists in Groups'",
+"ALTER TABLE Groups ADD `ParentId` int(10) unsigned AFTER `Name`"
+));
+
+PREPARE stmt FROM @s;
+EXECUTE stmt;