Problem $2$: The library

Mr$.$ Hook is an academic library manager. He is responsible for purchasing and maintaining books and periodicals, which can be read and$/$or borrowed by registered users. The library serves $3$ types of users: guest users, students, and teacher.

For all the types of users, the library assigns a unique user number. Additionally, Mr$.$ Hook needs to know their name $($first and last names$),$ age, and education level. Students must also inform which course they are taking, their student ID number, and the year of entry. Teachers must indicate their departments, a list of courses they teach and their degree. Guest users do not need to provide any additional information.

Books and periodicals are both considered publications. A publication has a unique ISBN, title, issue number, year, and number of available copies. Periodicals have the name of the organizers, subtitle $($which registers the theme of that edition$),$ volume and number. Books has a list of authors, publisher, and city.

All the users can borrow or read books, but only read periodicals. Book loans are different for each type of user:

Students: maximum of $4$ books, for up to $14$ days;

Teachers: maximum of $10$ books, for up to $180$ days;

Guests: maximum of up to $4$ books for up to $7$ days.

When a user borrows a book, the checkout date, expected return date, and actual return date must be recorded. In case of delays to return the book, a fine must be calculated, in the amount of $$1\mathrm{.}00$ per day of delay. Copies must be available for borrowing.

Users can read any available publication. About a reading, Mr$.$ Hook wants to know who is reading the publication, what publication they are reading and the date and time the user checked out and returned the publication to the returning tray.

Teachers can request books for class research, which can no longer be borrowed, but only read at the library. When the teacher requests a book, Mr$.$ Hook wants to know the date when the request was made and the expiration date.