require('dotenv').config();
const mysql = require('mysql2/promise');
(async () => {
  const u = new URL(process.env.DATABASE_URL);
  const c = await mysql.createConnection({
    host: u.hostname, port: Number(u.port),
    user: decodeURIComponent(u.username),
    password: decodeURIComponent(u.password),
    database: u.pathname.replace(/^\//, ''),
  });
  // 保留 id 最小的, 删掉其余重名行
  for (const t of ['Strategy', 'Indicator']) {
    const [r] = await c.query('DELETE FROM ' + t + ' WHERE id NOT IN (SELECT min_id FROM (SELECT MIN(id) AS min_id FROM ' + t + ' GROUP BY name) AS keep)');
    console.log('[' + t + '] 删除 ' + r.affectedRows + ' 条重复行');
  }
  await c.end();
})().catch(e=>{console.error(e);process.exit(1)});