/**
 * HistoryStore (v2.17 + v2.19 + v2.20 cipher + FTS5)
 *
 * SQLite-backed query history with TTL + LRU eviction.
 * v2.19: adds profile_name column + filter + groupBy='profile' aggregate.
 * v2.20: SQLCipher encryption support + FTS5 virtual table for full-text search.
 */
import type { QueryHistoryEntry, QueryHistoryInput, HistoryFilter, ProfileHistoryAggregate } from './query-analyzer-types.js';
export interface HistoryStoreOptions {
    ttlDays?: number;
    maxRows?: number;
    /** v2.20: SQLCipher key for transparent encryption of history.db. */
    cipherKey?: string;
}
export declare class HistoryStore {
    readonly dbPath: string;
    readonly options: HistoryStoreOptions;
    private conn;
    private initPromise;
    private cipherKey?;
    private _encrypted;
    /** v2.20: true after init() once the backend is known to be SQLCipher. */
    get encrypted(): boolean;
    constructor(dbPath: string, options: HistoryStoreOptions);
    private init;
    record(input: QueryHistoryInput): Promise<void>;
    query(filter: HistoryFilter): Promise<QueryHistoryEntry[] | ProfileHistoryAggregate[]>;
    cleanup(): Promise<{
        deleted: number;
    }>;
    close(): Promise<void>;
    /** v2.20: rotate cipher key. */
    rotateKey(newKey: string): Promise<void>;
    private rowToEntry;
}
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