Developer handoff

Java model and ER diagram.

A simple backend-ready structure for brands, phones, customers, carts, and orders.

Java entity starter

Spring Boot / JPA-compatible model.

// Java Spring Boot entity handoff
@Entity
class MobilePhone {
  @Id @GeneratedValue private Long id;
  private String brand;
  private String model;
  private BigDecimal price;
  private Integer stock;
}

ER diagram

Core store relationships.

BRAND

brand_id · name

│ 1 : many │

MOBILE_PHONE

phone_id · brand_id · model · price · stock

│ many : 1 │

CART_ITEM

cart_id · phone_id · quantity

│ many : 1 │

CUSTOMER

customer_id · name · email

│ many : 1 │

ORDER_ITEM

order_id · phone_id · quantity

│ many : 1 │

ORDER

order_id · customer_id · total