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Model a dimension bitemporally so you can answer 'what did we believe the customer's plan was, as of last Tuesday?'

SCD2 tracks when an attribute was true; bitemporal also tracks when you knew it. The question separates engineers who can audit a number from those who quietly overwrite history when a correction arrives.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

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Preserve valid history and the history of what you knew →
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Foundations of Forward Deployed Engineering · syllabus

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Model a dimension bitemporally so you can answer 'what did we believe the customer's plan was, as of last Tuesday?'

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