Royalty uploads that store only a monthly total force every later analyst to reverse-engineer the story. Insist on unit ID, open date, period start and end, net sales, labour hours, and a channel split when delivery exists.
Keep a change log when a POS vendor alters column names. Half of our delayed franchise performance reporting packs start with silent schema drift between January and February extracts.
If you cannot spare a data steward, schedule a quarterly hygiene hour with your reporting partner. Cleaning files after the board date is always more expensive.