insert into `user`(username, password) values('user1', '123'), ('user2', '234')...

server:
  port: 8080
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/time_test?rewriteBatchedStatements=true
    username: root
    password:
  jpa:
    show-sql: false
    hibernate:
      ddl-auto: validate
    database-platform: org.hibernate.dialect.MySQL5Dialect
    properties:
      hibernate.jdbc.batch_size: 50
      hibernate.order_inserts: true
      hibernate.order_updates: true

insert into `user`(username, password) values('user1', '123');
insert into `user`(username, password) values('user2', '123');

@Entity
@Data
@Builder
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String username;
    private String password;
}