text: drop table if exists t_mp_user;
  create table t_mp_user
  (
      id        bigint auto_increment,
      username  varchar(255) not null,
      password  varchar(255) not null,
      avatar    varchar(255) null,
      createdAt varchar(255) null,
      updatedAt varchar(255) null,
      constraint t_mp_user_pk
          primary key (id)
  )
      comment '用户表';
  create unique index t_mp_user_username_uindex
      on t_mp_user (username);