The problem
In most ateliers the memory of the house lives in three places: a messaging thread, a paper notebook, and the head of the atelier. It works, right up until the person who remembers is unavailable — or until a client returns after two years and expects to be known.
What gets lost is never the invoice. It is the measurement taken last spring, the stone that was shown and quietly refused, the deadline that was really an anniversary, the preference nobody wrote down because everybody knew it.