HOR-2870

Slow query detected when a case is deleted (APP_MESSAGE table)

workflow/engine/data/mysql/schema.sql

@@ -161,7 +161,8 @@ CREATE TABLE `APP_MESSAGE`
 	`APP_MSG_SEND_DATE` DATETIME  NOT NULL,
 	`APP_MSG_SHOW_MESSAGE` TINYINT default 1 NOT NULL,
 	`APP_MSG_ERROR` MEDIUMTEXT,
-	PRIMARY KEY (`APP_MSG_UID`)
+	PRIMARY KEY (`APP_MSG_UID`),
+	KEY `indexForAppUid`(`APP_UID`)
 )ENGINE=InnoDB  DEFAULT CHARSET='utf8' COMMENT='Messages in an Application';
 #-----------------------------------------------------------------------------
 #-- APP_OWNER