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The rota grid starts each row with its ISO week number, and for an owner the number is a button: one tap opens a sheet for that week, showing who holds each of its seven days, and puts one person on all of them. A rota is usually handed out by the week, and seven taps on seven days was the only way to do it short of the range form. ISO 8601 numbering, because the grid already runs Monday to Sunday: week 1 is the one holding the year's first Thursday, which is taken from the Thursday of the row so the year boundaries come out right (2025-12-29 is week 1 of 2026, 2020-12-31 is week 53). Days already past are left alone. Who was on call last Tuesday is a fact, and "the whole week" should not rewrite it, so a half-elapsed week covers the days still to come and the sheet says so; a week that is entirely over has nothing to assign. By default the assignment replaces whoever holds those days, as the day sheet does and the sheet states, and a checkbox limits it to the days nobody has yet. The overhang into the neighbouring month is part of the same week and is included. Web UI only: the existing schedule endpoint already takes a list of dates and a replace flag, so nothing changed on the server and there is nothing to mirror in terdut-tui.