import type { HexString } from '@polkadot/util/types';
export interface BlockEntry {
    hash: HexString;
    number: number;
    header: HexString;
    parentHash: HexString | null;
    extrinsics: HexString[];
    storageDiff: Record<HexString, HexString | null> | null;
}
export interface KeyValueEntry {
    blockHash: string;
    key: string;
    value: string | null;
}
export declare class Database {
    constructor(location: string);
    close: () => Promise<void>;
    saveBlock: (block: BlockEntry) => Promise<void>;
    queryBlock: (hash: HexString) => Promise<BlockEntry | null>;
    queryBlockByNumber: (number: number) => Promise<BlockEntry | null>;
    queryHighestBlock: () => Promise<BlockEntry | null>;
    deleteBlock: (hash: HexString) => Promise<void>;
    blocksCount: () => Promise<number>;
    saveStorage: (blockHash: HexString, key: HexString, value: HexString | null) => Promise<void>;
    saveStorageBatch?: (entries: KeyValueEntry[]) => Promise<void>;
    queryStorage: (blockHash: HexString, key: HexString) => Promise<KeyValueEntry | null>;
    queryPagedKeys?: (blockHash: HexString, prefix: HexString) => Promise<HexString[] | null>;
    savePagedKeys?: (blockHash: HexString, prefix: HexString, keys: HexString[]) => Promise<void>;
    queryRpcCall?: (scope: string, method: string, params: string) => Promise<string | null>;
    saveRpcCall?: (scope: string, method: string, params: string, result: string) => Promise<void>;
}