Agenda: StorageDescriptor<
    [Key: number],
    (
        | {
            call: PreimagesBounded;
            maybe_id?: FixedSizeBinary<32>;
            maybe_periodic?: FixedSizeArray<2, number>;
            origin: PolkadotRuntimeOriginCaller;
            priority: number;
        }
        | undefined
    )[],
    false,
    never,
>

Items to be executed, indexed by the block number that they should be executed on.