A gap we found in our own checking
A margin problem the first version of this product missed entirely
The original margin check only scored the exact combination a supplier proposed. A reviewer who kept the supplier's new cost but typed in their own sell price was never checked at all — and that gap let a real 6.2% margin through silently during testing, found by someone testing an actual reviewer's workflow, not designed as a test case after the fact. The fix reruns the same margin check on every edit now, live, no matter which field someone changes. This is the kind of thing we'd rather find ourselves than have a customer find first.