import type { MigrationDb } from "./index";
/**
 * Migration 043: Multi-agent support
 *
 * 1. Creates the `agents` table — agent roster with per-agent read policy.
 * 2. Adds `agent_id` to `memories` — which agent owns each memory.
 * 3. Adds `visibility` to `memories` — per-memory access flag.
 *    Values: 'global' (any permitted agent), 'private' (owner only),
 *    'archived' (soft-deleted when owning agent is removed).
 *
 * Note: the existing `scope` column on memories is for benchmark namespacing
 * (e.g. "memorybench:question_42_run1") and is NOT related to this.
 */
export declare function up(db: MigrationDb): void;
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