import type { StorageBackend, RunResult } from './backend.js';
/**
 * Opt-in native backend using better-sqlite3.
 * Activated via DEP_TRACER_BACKEND=native.
 * Falls back gracefully if the native module isn't available.
 */
export declare class NativeBackend implements StorageBackend {
    private db;
    private constructor();
    static create(dbPath: string): Promise<NativeBackend>;
    run(sql: string, params?: unknown[]): RunResult;
    all<T = Record<string, unknown>>(sql: string, params?: unknown[]): T[];
    get<T = Record<string, unknown>>(sql: string, params?: unknown[]): T | undefined;
    transaction<R>(fn: () => R): R;
    exec(sql: string): void;
    serialize(): Buffer | null;
    close(): void;
}
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