Questions (ERD Design) Spa-Fabulous is a medium sized company that offers treatments to its customers. They need you to design their database system for them. Below are the business rules you will need to design the database. Therapists can treat many customers, and a therapist must treat at least one customer and as many customers as possible. A customer can be treated by many therapists. A customer must be treated by a minimum of 1 therapist and maximum of 5. Treatments use many products. A treatment does not always use products, however a product can be used by only 1 treatment