text: alter table users
    drop qq;
  
  alter table users
    add qq_openid varchar(255)
    after gitlab_username;
  
  alter table users
    add wechat_openid varchar(255)
    after qq_openid;
  
  alter table cookie drop foreign key fk_cookie_client_id_oauth_client_details_client_id;
  alter table cookie drop client_id;