All chains
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    Sessions: StorageDescriptor<
        [Key: number],
        {
            active_validator_indices: number[];
            assignment_keys: FixedSizeBinary<32>[];
            discovery_keys: FixedSizeBinary<32>[];
            dispute_period: number;
            n_cores: number;
            n_delay_tranches: number;
            needed_approvals: number;
            no_show_slots: number;
            random_seed: FixedSizeBinary<32>;
            relay_vrf_modulo_samples: number;
            validator_groups: number[][];
            validators: FixedSizeBinary<32>[];
            zeroth_delay_tranche_width: number;
        },
        true,
        never,
    >

    Session information in a rolling window. Should have an entry in range EarliestStoredSession..=CurrentSessionIndex. Does not have any entries before the session index in the first session change notification.