CREATE TABLE history_log_tmp (
	id		bigint unsigned		DEFAULT '0'	NOT NULL,
	itemid		bigint unsigned		DEFAULT '0'	NOT NULL,
	clock		integer		DEFAULT '0'	NOT NULL,
	timestamp		integer		DEFAULT '0'	NOT NULL,
	source		varchar(64)		DEFAULT ''	NOT NULL,
	severity		integer		DEFAULT '0'	NOT NULL,
	value		text		DEFAULT ''	NOT NULL,
	PRIMARY KEY (id)
) ENGINE=InnoDB;
CREATE INDEX history_log_1 on history_log_tmp (itemid,clock);

insert into history_log_tmp select * from history_log;
drop table history_log;
alter table history_log_tmp rename history_log;
