CREATE DATABASE IF NOT EXISTS game_2048;
USE game_2048;

CREATE TABLE IF NOT EXISTS users (
  id INT AUTO_INCREMENT PRIMARY KEY,
  username VARCHAR(50) NOT NULL UNIQUE,
  password VARCHAR(255) NOT NULL,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS leaderboard (
  id INT AUTO_INCREMENT PRIMARY KEY,
  user_id INT,
  username VARCHAR(50),
  score INT NOT NULL,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE SET NULL
);

CREATE INDEX idx_score ON leaderboard(score DESC);