code: def manage_all(self, *args, **kwargs):
          
          for site, site_data in self.iter_unique_databases(site='all'):
              if self.verbose:
                  print('-'*80, file=sys.stderr)
                  print('site:', site, file=sys.stderr)
              if self.env.available_sites_by_host:
                  hostname = self.current_hostname
                  sites_on_host = self.env.available_sites_by_host.get(hostname, [])
                  if sites_on_host and site not in sites_on_host:
                      self.vprint('skipping site:', site, sites_on_host, file=sys.stderr)
                      continue
              self.manage(*args, **kwargs)
docs: Runs manage() across all unique site default databases.