text: CREATE EXTENSION IF NOT EXISTS pgcrypto;
  DROP TABLE IF EXISTS users;
  CREATE TABLE users (
      id uuid DEFAULT gen_random_uuid (),
      username VARCHAR NOT NULL UNIQUE,
      email VARCHAR NOT NULL UNIQUE,
      password VARCHAR NOT NULL,
      PRIMARY KEY (id)
  );
  
  -- ROLLBACK
  -- DROP EXTENSION pgcrypto;
  -- DROP TABLE IF EXISTS users;