/**
 * Database client singleton for iranti.
 *
 * Wraps Prisma + pg with a module-level singleton so the entire process shares
 * one connection pool. The singleton is intentionally strict: calling `initDb`
 * a second time with different credentials throws rather than silently replacing
 * the pool, preventing the class of bugs where two callers race to initialise
 * with different parameters.
 *
 * Connection configuration (via `InitDbOptions`):
 *  - `applicationName` — sets `application_name` on the pg pool (visible in
 *    `pg_stat_activity`; useful for distinguishing iranti vs. control-plane)
 *  - `max` — pool size (default 10)
 *
 * Lifecycle:
 *  - `initDb(url, opts)` — create pool + Prisma client; idempotent for same URL
 *  - `getDb()`           — get the live client; throws if not yet initialised
 *  - `disconnectDb()`    — shut down LISTEN/NOTIFY listener, disconnect Prisma,
 *                          drain the pool
 *  - `getDbConnectionString()` — returns the URL used at init (for logging)
 *  - `prisma` alias      — legacy re-export of `getDb`, kept for compat
 */
import { PrismaClient } from '../generated/prisma/client';
type InitDbOptions = {
    applicationName?: string;
    max?: number;
};
export declare function initDb(connectionString: string, options?: InitDbOptions): PrismaClient;
export declare function getDb(): PrismaClient;
export declare function getDbConnectionString(): string | null;
export declare function disconnectDb(): Promise<void>;
export { getDb as prisma };
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