I don't think it really makes a difference...but what pugdog was alluding to you is that rather than using columns/fields in LINKS to authenticate users, you should use the built-in USERNAME/PASSWORD authentication from the USERS table.
Simply using ID or URL as accessing records is not very secure to say the least.
Regards,
Eliot Lee
Simply using ID or URL as accessing records is not very secure to say the least.
Regards,
Eliot Lee