Challenge: Quarkus Data

Problem statement

Let’s consider a library management application that will keep track of two different entities:

• Book entity: We’ll keep this in a MongoDB database.
• Customer entity: We’ll save this in an SQL database (we use H2 for simplicity in the code).

The goal is to create an API to add new customers and books that can mark a book as rented by a customer. For the sake of simplicity, a book can only be rented by one customer.