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    MigrationProcess: StorageDescriptor<
        [],
        {
            child_items: number;
            progress_child: Enum<
                { Complete: undefined; LastKey: Binary; ToStart: undefined },
            >;
            progress_top: Enum<
                { Complete: undefined; LastKey: Binary; ToStart: undefined },
            >;
            size: number;
            top_items: number;
        },
        false,
        never,
    >

    Migration progress.

    This stores the snapshot of the last migrated keys. It can be set into motion and move forward by any of the means provided by this pallet.