Well thats mainly up to yourself. Some people like it seperate (especially in large organisations) and some don't.

Peronally I don't like get it too seperate. That just means extra work while (in not so big organisations) it's not that important. As for the login table, yes I would suggest keeping the login and his profile appart. Login credentials are different than profile information.

But everyone has a different view of this subject though.

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Nunchaku! Who doesn't like martial arts? =)