/**
 * PlanHistory (v3.1)
 *
 * SQLite-backed store for EXPLAIN plan snapshots. Independent file
 * (plan_history.db) so it doesn't bloat v2.17 query_history.
 */
export interface PlanHistoryEntry {
    id?: number;
    queryHash: string;
    sqlTemplate: string;
    sqlOriginal: string;
    planJson: string;
    dbType: string;
    profileName: string | null;
    capturedAt: string;
    durationMs: number;
}
export interface PlanHistoryOptions {
    dbPath: string;
}
export declare class PlanHistory {
    readonly options: PlanHistoryOptions;
    private conn;
    private initPromise;
    constructor(options: PlanHistoryOptions);
    private init;
    /** Persist one EXPLAIN snapshot. */
    capture(entry: PlanHistoryEntry): Promise<void>;
    /** All snapshots for one normalized query hash (oldest → newest). */
    getByHash(queryHash: string): Promise<PlanHistoryEntry[]>;
    /** Last N entries (by capture time). */
    list(limit?: number): Promise<PlanHistoryEntry[]>;
    /** Close file handle (call before process exit). */
    close(): Promise<void>;
    private rowToEntry;
}
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