They open the app at breakfast, glance at yesterday’s sales, feel briefly good or briefly anxious, and close it again. The fix is boring and it works: one fixed report, same metrics, same day, every week. Not because weekly data is magic, but because it’s the shortest interval at which Amazon’s numbers are stable enough to act on and the longest you can go without a problem compounding out of control. Here’s the structure worth copying, what each number actually tells you, and how to stop assembling it by hand. A single ASIN doing 20 units a day will swing 40% between a Tuesday and a Saturday for no reason at all.