Preparing a customer database for bookings
Decide what you genuinely need on a customer beyond a name and a way to reach them — the list is shorter than it feels. Agree how notes are written, because a shared record is only useful if everybody writes the same kind of thing in it; “prefers Elena, allow extra time” is useful, an opinion about the customer is not. Decide who on the team can see contact details and who can only see their own day. Bring in the regulars you already have, with the two or three facts about each that keep going wrong. Then use the record for a month and delete the fields nobody filled.
Not a sales CRM or a marketing list
It remembers customers so the work goes well; it does not sell to them.