docs: def get_schema_model():
      """
      Returns the schema model that is active in this project.
      """
      try:
          return django_apps.get_model(settings.POSTGRES_SCHEMA_MODEL, require_ready=False)
      except ValueError:
          raise ImproperlyConfigured("POSTGRES_SCHEMA_MODEL must be of the form 'app_label.model_name'")
      except LookupError:
          raise ImproperlyConfigured(
              "POSTGRES_SCHEMA_MODEL refers to model '%s' that has not been installed" % settings.POSTGRES_SCHEMA_MODEL
          )