Use cases:

1. Query users for specific criteria, such as near expiration date (or graduation date) and owe the library more than $100, in order to send these users an ad-hoc notice.

2. Query users once a quarter for outstanding fee/fines and send reminder notices with a comprehensive list of all fee/fines on a single notice per patron.

3. From Duke: It may be the case that we want to do a second notice for a hold pickup ad-hoc, rather than systematically. I can see branches that might want both - our bigger branches wanting second notices to go automatically to save overhead, whereas smaller branches want to do it for particular patrons but not bother others.