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Field notes

What we found while building

Measurement defects, architecture decisions, and the occasions when the model made something up. Written during delivery rather than after it.

5 results

MeasurementAugust 8, 2026· 4 min read

Count from the catalog, not from the page

A screen reported seven products selling below cost. The catalog held twenty-six. The bug was not in the calculation, it was in what the count was computed over.

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MeasurementAugust 5, 2026· 6 min read

Revenue computed at the wrong grain

Calculate revenue from invoice headers instead of the underlying postings and you fold in things that are not revenue, then find a third of it will not attribute to anything.

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