code: def run_migrations_online(config):
      
      connectable = engine_from_config(
          config.get_section(config.config_ini_section),
          prefix='sqlalchemy.',
          poolclass=pool.NullPool)
  
      with connectable.connect() as connection:
          alembic.context.configure(connection=connection)
  
          with alembic.context.begin_transaction():
              alembic.context.run_migrations()
docs: Run migrations in 'online' mode.
  
      In this scenario we need to create an Engine and associate a
      connection with the context.