docs: def _push_forever_keys(self, namespace, key):
          """
          Store a copy of the full key for each namespace segment.
  
          :type namespace: str
          :type key: str
          """
          full_key = '%s%s:%s' % (self.get_prefix(),
                                  hashlib.sha1(encode(self._tags.get_namespace())).hexdigest(),
                                  key)
  
          for segment in namespace.split('|'):
              self._store.connection().lpush(self._forever_key(segment), full_key)