code: def flush(self, meta=None):
          '''Flush all model keys from the database'''
          pattern = self.basekey(meta) if meta else self.namespace
          return self.client.delpattern('%s*' % patternf flush(self, meta=None):
          '''Flush all model keys from the database'''
          pattern = self.basekey(meta) if meta else self.namespace
          return self.client.delpattern('%s*' % pattern)
docs: Flush all model keys from the database