Initial commit

backend/src/main/java/com/maternalmall/domain/CartItem.java

@@ -0,0 +1,22 @@
+package com.maternalmall.domain;
+
+import jakarta.persistence.*;
+import lombok.Data;
+
+@Data
+@Entity
+@Table(name = "cart_item", uniqueConstraints = @UniqueConstraint(columnNames = {"customerId", "productId"}))
+public class CartItem {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false)
+    private Long customerId;
+
+    @Column(nullable = false)
+    private Long productId;
+
+    @Column(nullable = false)
+    private Integer quantity;
+}