ALTER TABLE `Contract` 
ADD COLUMN `UpdTs` datetime NULL DEFAULT NULL;

ALTER TABLE `ContractHistory` 
ADD COLUMN `ContractOid` bigint NULL DEFAULT NULL;

ALTER TABLE `AbsenceTime` 
ADD COLUMN `UpdTs` datetime NULL DEFAULT NULL;

CREATE TABLE IF NOT EXISTS `AbsenceTimeHistory` (
  `Oid` bigint NOT NULL AUTO_INCREMENT,
  `Tid` int NOT NULL,
  `Notice` varchar(1024) DEFAULT NULL,
  `InsTs` datetime DEFAULT NULL,
  `InsUser` varchar(256) DEFAULT NULL,
  `Version` bigint DEFAULT NULL,
  `UdpUser` varchar(256) DEFAULT NULL,
  `UpdTs` datetime DEFAULT NULL,
  `IsActive` tinyint DEFAULT NULL,
  `SystemEntryID` int DEFAULT NULL,
  `ChangeType` tinyint NULL DEFAULT NULL,
  `AbsenceTimeOid` bigint NULL DEFAULT NULL,
  `AbsenceReasonOid` bigint DEFAULT NULL,
  `AbsenceTimeStart` datetime DEFAULT NULL,
  `AbsenceTimeEnd` datetime DEFAULT NULL,
  `AbsenceTimeKrankheitsMeldung` datetime DEFAULT NULL,
  `AbsenceTimeNotice` varchar(1024) DEFAULT NULL,
  `AbsenceTimeEmployeeOid` bigint DEFAULT NULL,
  `AbsenceTimeCustomerOid` bigint DEFAULT NULL,
  PRIMARY KEY (`Oid`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;