Problems to fix

Groups of teachers who share one registration fault — two ID#s, one ID# between two people, an address that cannot receive mail, a typo, a rehearsal row. Each group says what it is, why it matters and the fix. Nothing happens until you have seen the steps and confirmed them: press Fix this and you get a dry run first, listing every change and the full text of any email, and only then a button that does it. Some steps delete a record or write to a teacher — those say so, and the database is copied before anything is deleted.