Blackout dates
A new blackout that overlaps an existing booking doesn't cancel it.
The conflict is listed when you save, with a link to each booking, and staff decide whether to move it, cancel it with the member, or let it stand. Nothing automatic touches a confirmed stay.
What a member sees
A member sees “Not open for booking.” and never the reason. The note column exists on this screen and in the audit log, and nothing carries it to a member screen.
Blackout nights draw as the hatched state on the Casa Plata calendar, whether the scope is one unit or all of them.