/**
 * SQLite access for the docs index and the request queue.
 *
 * This uses Node's built-in `node:sqlite`, not a native addon. An addon is built
 * for one Node ABI, and `npx` shares its cache between Node versions: a copy
 * installed under Node 22 failed to load under Node 24. The built-in module
 * always matches the Node running it.
 */
import { DatabaseSync } from "node:sqlite";
export type Database = DatabaseSync;
/** Open a database file, or ":memory:". A read-only open fails when the file does not exist. */
export declare function openDatabase(path: string, options?: {
    readonly?: boolean;
}): Database;
/** Run `work` inside one transaction, rolling back if it throws. */
export declare function transaction<T>(db: Database, work: () => T): T;
/** The first column of a pragma's first row, such as "ok" from quick_check. */
export declare function pragmaValue(db: Database, pragma: string): unknown;