code: def unquoted(self):
          
          key = str(self)
          if key.startswith('"') and key.endswith('"'):
              return key[1:-1]
          return key
docs: Return *key* with one level of double quotes removed.
  
          Redshift stores some identifiers without quotes in internal tables,
          even though the name must be quoted elsewhere.
          In particular, this happens for tables named as a keyword.