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Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/c4120379706850af#

I think, that we should review how we use NULL columns in system.
For  For example we INT field can't have empty value unless it is NULL. VARCHAR
fields VARCHAR fields can have empty value and in most cases are NOT NULL. 

What I propose is at least to convert all columns, that contain DATE and
USER_ID in them to NULL. We also have ModifiedById field for topics set to 0
in database, but to -1 (root) in unit config, which will make topic always
modified always modified by "root", once it is created on front-end. 

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