docs: def db_for_write(self, model, **hints):
          """
          Prevent write actions on read-only tables.
  
          Raises:
              WriteNotSupportedError: If models.sf_access is ``read_only``.
  
          """
          try:
              if model.sf_access == READ_ONLY:
                  raise WriteNotSupportedError("%r is a read-only model." % model)
          except AttributeError:
              pass
          return None