:VERSION 1         # -------------------------- 

BEGIN;

CREATE TABLE `Presence` (
    `UserID` VARCHAR(255) NOT NULL,
    `RegionID` CHAR(36) NOT NULL DEFAULT '00000000-0000-0000-0000-000000000000',
    `SessionID` CHAR(36) NOT NULL DEFAULT '00000000-0000-0000-0000-000000000000',
    `SecureSessionID` CHAR(36) NOT NULL DEFAULT '00000000-0000-0000-0000-000000000000'
) ENGINE=MyISAM;

CREATE UNIQUE INDEX SessionID ON Presence(SessionID);
CREATE INDEX UserID ON Presence(UserID);

COMMIT;

:VERSION 2         # -------------------------- 

BEGIN;

ALTER TABLE `Presence` ADD COLUMN LastSeen timestamp;

COMMIT;

:VERSION 3         # -------------------------- 

BEGIN;

CREATE INDEX RegionID ON Presence(RegionID);

COMMIT;