code: func (*Config) Delete(c context.Context, req *config.DeleteRequest) (*empty.Empty, error) {
  	if req.GetId() == "" {
  		return nil, status.Errorf(codes.InvalidArgument, "ID is required")
  	}
  	if err := datastore.Delete(c, &model.Config{ID: req.Id}); err != nil {
  		return nil, errors.Annotate(err, "failed to delete config").Err()
  	}
  	return &empty.Empty{}, nil
  }
docs: // Delete handles a request to delete a config.
  // For app-internal use only.