/**
 * Migration 088: Create agent_questions table (spec 093).
 *
 * Unified question/escalation surface that bridges the SDK V2
 * AskUserQuestion path and background-agent approval gates.
 *
 * Indexes:
 *  - (app_id, feature_id, status) for scoped inbox queries.
 *  - (agent_run_id) for run-scoped lookups.
 *  - (status, expires_at) drives the auto-expiry sweep efficiently.
 */
import type { MigrationParams } from 'umzug';
import type Database from 'better-sqlite3';
export declare function up({ context: db }: MigrationParams<Database.Database>): Promise<void>;
export declare function down({ context: db }: MigrationParams<Database.Database>): Promise<void>;
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