const { Client } = require('pg');
const client = new Client('postgres://postgres:csh%402018@localhost:5432/ai_pharmacy');
client.connect().then(async () => {
  try {
    await client.query("ALTER TABLE products ADD COLUMN pack_size INTEGER DEFAULT 1;");
    console.log('Added pack_size column to products table.');
  } catch (err) {
    if (err.code === '42701') {
      console.log('pack_size column already exists.');
    } else {
      console.error(err);
    }
  }
  process.exit(0);
}).catch(console.error);