text: create database if not exists tictactoe;
  use tictactoe;
  
  create table if not exists game (
      game_id int primary key auto_increment,
      player_x_alias varchar(15) not null,
      player_y_alias varchar(15) not null,
      winner enum('x', 'y', 'draw') null,
      game_over tinyint(1) default '0',
      created datetime default current_timestamp,
      modified datetime null on update current_timestamp
  );
  
  create table if not exists game_move(
      move_id bigint(20) primary key auto_increment,
      game_id int not null,
      player_x_move varchar(2) null default '--',
      player_y_move varchar(2) null default '--',
      created datetime default current_timestamp,
      modified datetime null on update current_timestamp,
  
      foreign key (game_id) references game(game_id)
  );