As a general rule any table I design that has data entry, I'll add four 'auditing' columns to it that populate via INSERT and UPDATE triggers:
created_dt - datetime - of the entry
created_by_id - varchar(30) - SUSER_NAME() of the person creating it
last_updated_dt - datetime - of any insert-update
last_updated_by_id - varchar(30) - SUSER_NAME() of the person updating it.
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