/**
 * PostgresApprovalStore — durable ApprovalStore adapter backed by PostgreSQL.
 *
 * Companion schema: src/manifest/approval/stores/postgres.sql.
 *
 * Persistence model: one row per approval request, keyed by the runtime's
 * opaque `${entity}:${instanceId}:${approvalName}` key (PRIMARY KEY). The
 * full request state is stored across typed columns; `required_stages` and
 * `grants` are JSONB so they round-trip without a join table.
 *
 * Upsert: `save` uses `INSERT … ON CONFLICT (key) DO UPDATE` so creating a
 * pending request and later recording grants/denials are both a single
 * statement. The latest write wins — the runtime always saves the complete
 * state, never a partial patch.
 *
 * Expiry: `expire` is a single set-based `UPDATE … WHERE status='pending'
 * AND expires_at <= $1 RETURNING *`, so a cron/worker can sweep timeouts
 * without loading the table. See
 * https://www.postgresql.org/docs/current/sql-update.html § "Outputs".
 *
 * DO NOT import this file in browser code — it requires `pg`.
 */
import type { Pool } from 'pg';
import type { ApprovalRequestState } from '../../runtime-engine';
import type { ApprovalStore } from '../approval-store';
export interface PostgresApprovalStoreOptions {
    /** A pg Pool. The store does NOT own the pool's lifecycle. */
    pool: Pool;
    /** Table name override. Default: `manifest_approval_requests`. */
    tableName?: string;
}
export declare class PostgresApprovalStore implements ApprovalStore {
    private pool;
    private tableName;
    constructor(opts: PostgresApprovalStoreOptions);
    load(key: string): Promise<ApprovalRequestState | undefined>;
    save(key: string, state: ApprovalRequestState, tx?: unknown): Promise<void>;
    list(): Promise<ApprovalRequestState[]>;
    expire(now: number): Promise<ApprovalRequestState[]>;
}
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