code: def shell(self, name='default', site=None, **kwargs):
          
          r = self.database_renderer(name=name, site=site)
          self.write_pgpass(name=name, site=site, root=True)
  
          db_name = kwargs.get('db_name')
          if db_name:
              r.env.db_name = db_name
              r.run('/bin/bash -i -c "psql --username={db_root_username} --host={db_host} --dbname={db_name}"')
          else:
              r.run('/bin/bash -i -c "psql --username={db_root_username} --host={db_host}"')
docs: Opens a SQL shell to the given database, assuming the configured database
          and user supports this feature.