Saturday Outage #01 (SQL): a wrong till total

Saturday morning. Last night's report announces 412,000 FCFA in sales. Mama Ngo counted 287,000 in the drawer and on her phone, three times. For a week, her new cash register has had an evening report, written by Ludovic before he left for the weekend. And for a week, it has been lying. Four errors are hiding in this report, and each day of the week shows a different one. It is up to you to trace the view back to the calculation, find what skews each day, then fix the report without breaking the export the accountant imports every Monday. Saturday Outage is a short challenge with no step-by-step guide: a mission, a broken database, one hour. The solution is at the end of the guide, folded: play first, read afterwards.