@callback available?() :: boolean()

@callback recall(
  String.t(),
  keyword()
) :: {:ok, [map()]} | {:error, term()}

@callback reflect(
  String.t(),
  keyword()
) :: {:ok, String.t()} | {:error, term()}

@callback retain(String.t(), map(), keyword()) :: :ok

@callback retain_sync(String.t(), map(), keyword()) :: {:ok, map()} | {:error, term()}