ALTER TABLE {$NAMESPACE}_timeline.timeline_event
ADD dataID int unsigned;
ALTER TABLE {$NAMESPACE}_timeline.timeline_event
ADD UNIQUE KEY (dataID);
UPDATE {$NAMESPACE}_timeline.timeline_event e,
{$NAMESPACE}_timeline.timeline_eventdata d
SET e.dataID = d.id
WHERE d.eventID = e.id;
ALTER TABLE {$NAMESPACE}_timeline.timeline_eventdata
DROP eventID;