/**
 * TemplateStore (v2.17 + v2.19 + v2.20 cipher)
 *
 * SQLite-backed CRUD for parameterized SQL templates.
 * Uses v2.16 multi-backend SQLite, transparently switching to SQLCipher
 * when a non-empty cipherKey is provided (v2.20).
 */
import type { Template, TemplateInput } from './query-analyzer-types.js';
export interface TemplateStoreOptions {
    /**
     * v2.20: SQLCipher key for transparent encryption of templates.db.
     * Undefined/empty → plaintext (v2.17-v2.19 behavior).
     */
    cipherKey?: string;
}
export declare class TemplateStore {
    readonly dbPath: string;
    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?: TemplateStoreOptions);
    private init;
    save(input: TemplateInput, createdBy?: string): Promise<Template>;
    list(filter?: {
        tag?: string;
        profileName?: string | null;
    }): Promise<Template[]>;
    get(id: string): Promise<Template | null>;
    delete(id: string): Promise<boolean>;
    incrementUseCount(id: string): Promise<void>;
    close(): Promise<void>;
    /** v2.20: rotate cipher key. */
    rotateKey(newKey: string): Promise<void>;
    private queryAll;
    private rowToTemplate;
}
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