Merged in 3.1 (pull request #4703)

Updating branch HOR-1500 with last 3.1 changes

workflow/engine/data/mysql/schema.sql

@@ -2998,6 +2998,8 @@ CREATE TABLE `NOTIFICATION_QUEUE`
 	`NOT_DATA` MEDIUMTEXT  NOT NULL,
 	`NOT_STATUS` VARCHAR(150)  NOT NULL,
 	`NOT_SEND_DATE` DATETIME  NOT NULL,
+	`APP_UID` VARCHAR(32) default '' NOT NULL,
+	`DEL_INDEX` INTEGER default 0 NOT NULL,
 	PRIMARY KEY (`NOT_UID`),
 	KEY `indexNotStatus`(`NOT_STATUS`)
 )ENGINE=InnoDB ;