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    SignedSubmissionIndices: StorageDescriptor<
        [],
        [
            { minimal_stake: bigint; sum_stake: bigint; sum_stake_squared: bigint },
            number,
            number,
        ][],
        false,
        never,
    >

    A sorted, bounded vector of (score, block_number, index), where each index points to a value in SignedSubmissions.

    We never need to process more than a single signed submission at a time. Signed submissions can be quite large, so we're willing to pay the cost of multiple database accesses to access them one at a time instead of reading and decoding all of them at once.