reap_page: TxDescriptor<
    {
        message_origin: Enum<
            {
                Aggregate: Enum<
                    { Here: undefined; Parent: undefined; Sibling: number },
                >;
                UnregisterMessageOrigin: undefined;
            },
        >;
        page_index: number;
    },
>

Remove a page which has no more messages remaining to be processed or is stale.