import { Pool } from 'pg';
export declare function createPool(databaseUrl: string): Pool;
export declare function initSchema(pool: Pool): Promise<void>;
/**
 * Starts a background job to clean up expired tokens and stale authorization codes.
 * Runs every 60 seconds by default. With 30-day access tokens and 90-day refresh tokens,
 * this prevents the database from accumulating stale credentials.
 */
export declare function startTokenCleanup(pool: Pool, intervalMs?: number): NodeJS.Timeout;