text: CREATE USER postgres_user WITH PASSWORD 'postgres_password';
  CREATE DATABASE book_storage WITH OWNER postgres_user;
  ALTER ROLE postgres_user SET client_encoding TO 'utf8';
  ALTER ROLE postgres_user SET default_transaction_isolation TO 'read committed';
  ALTER ROLE postgres_user SET timezone TO 'UTC';
  GRANT ALL PRIVILEGES ON DATABASE book_storage TO postgres_user;
  