/**
 * Unified database connector for PostgreSQL and SQLite.
 *
 * Provides a common async-iterable interface over query results.
 * Encrypted SQLite support is stubbed for future implementation.
 */
import type { DbConnection, DbSource } from './types';
/**
 * Connect to a database and return a unified DbConnection.
 */
export declare function connectDb(source: DbSource): Promise<DbConnection>;
/**
 * Detect database type from a connection string.
 * - Starts with "postgres://" or "postgresql://" → postgres
 * - Otherwise → sqlite (treat as file path)
 */
export declare function detectDbType(connectionString: string): DbSource['type'];