const mysql = require('mysql2/promise');
(async () => {
  // 🔴 口令不再内置明文（2026-09-23 入库口令处置 P2）。运行前请注入 DB_PASSWORD：
  //   DB_PASSWORD='<本机 DB 口令>' node show_tables.js
  const c = await mysql.createConnection({
    host: process.env.DB_HOST || 'localhost',
    user: process.env.DB_USER || 'root',
    password: process.env.DB_PASSWORD,
    database: process.env.DB_NAME || 'competition_db',
  });
  const [t] = await c.query('SHOW TABLES');
  t.forEach(r => console.log(Object.values(r)[0]));
  await c.end();
})();