import type { PostgresAdapter, PostgresConfig } from "../postgres/index.js";
import type { PathwayCoordinator } from "./types.js";
/**
 * PostgreSQL-backed implementation of PathwayCoordinator.
 * Uses two tables:
 * - `pathway_leases`: distributed locks for leader election
 * - `pathway_instances`: instance registration and heartbeating
 */
export declare class PostgresPathwayCoordinator implements PathwayCoordinator {
    private adapter;
    private initialized;
    private readonly leasesTable;
    private readonly instancesTable;
    constructor(adapter: PostgresAdapter, options?: {
        leasesTable?: string;
        instancesTable?: string;
    });
    private ensureInitialized;
    acquireLease(instanceId: string, key: string, ttlMs: number): Promise<boolean>;
    renewLease(instanceId: string, key: string, ttlMs: number): Promise<boolean>;
    releaseLease(instanceId: string, key: string): Promise<void>;
    register(instanceId: string, address: string): Promise<void>;
    heartbeat(instanceId: string): Promise<void>;
    unregister(instanceId: string): Promise<void>;
    getInstances(staleThresholdMs: number): Promise<Array<{
        instanceId: string;
        address: string;
    }>>;
}
/**
 * Factory function to create a PostgresPathwayCoordinator
 */
export declare function createPostgresPathwayCoordinator(config: PostgresConfig, options?: {
    leasesTable?: string;
    instancesTable?: string;
}): Promise<PostgresPathwayCoordinator>;
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