/**
 * Migration 028: Lossless Retention (Cold Tier)
 *
 * Replaces hard deletion of tombstoned memories with cold-tier archival.
 * Nothing is ever truly lost — expired memories are archived into
 * memories_cold before being removed from the active table.
 */
import type { MigrationDb } from "./index";
export declare function up(db: MigrationDb): void;
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