ALTER TABLE FeedItem ADD COLUMN Guid nvarchar(1000)
GO

UPDATE	FeedItem
SET		Guid = ''
WHERE	Guid IS NULL
GO

ALTER TABLE FeedItem ALTER COLUMN Guid nvarchar(1000) NOT NULL
GO

ALTER TABLE FeedItem ALTER COLUMN Guid SET DEFAULT ''
GO

UPDATE	Setting
SET		Value = '2'
WHERE	Name = 'DatabaseVersion'
GO