REST-api ER Diagram API Design Screenshot 1: Checkout of book 981003724 by patron 425198003 Screenshot 2: Checkout of book 981456123 by patron 425198003 Screenshot 3: Patron information for 425198003 after checking out two books Screenshot 4: Listing of the books table from MySQL Workbench Screenshot 5: Check-in of book 981003724 Screenshot 6: Patron information for 425198003 after returning one book Screenshot 7: Attempt to check in a book using an invalid book number Screenshot 8: Attempt to display patron information using an invalid patron number