feat(user-service): add JPA User entity and configure Spring Data JPA

second-part/hw-02/user-service/src/main/java/com/example/User.java

@@ -0,0 +1,94 @@
+package com.example;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.PrePersist;
+import jakarta.persistence.Table;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "users")
+public class User {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private Long id;
+
+  @Column(nullable = false, length = 100)
+  private String name;
+
+  @Column(nullable = false, unique = true, length = 255)
+  private String email;
+
+  @Column(nullable = false)
+  private Integer age;
+
+  @Column(name = "created_at", nullable = false, updatable = false)
+  private LocalDateTime createdAt;
+
+  protected User() {}
+
+  public User(String name, String email, Integer age) {
+    this.name = name;
+    this.email = email;
+    this.age = age;
+  }
+
+  @PrePersist
+  protected void onCreate() {
+    createdAt = LocalDateTime.now();
+  }
+
+  public Long getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getEmail() {
+    return email;
+  }
+
+  public Integer getAge() {
+    return age;
+  }
+
+  public LocalDateTime getCreatedAt() {
+    return createdAt;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public void setEmail(String email) {
+    this.email = email;
+  }
+
+  public void setAge(Integer age) {
+    this.age = age;
+  }
+
+  @Override
+  public String toString() {
+    return "User{"
+        + "id="
+        + id
+        + ", name='"
+        + name
+        + '\''
+        + ", email='"
+        + email
+        + '\''
+        + ", age="
+        + age
+        + ", createdAt="
+        + createdAt
+        + '}';
+  }
+}