/**
 * Migration 063: avoid FTS churn on metadata-only memory updates.
 *
 * Recall updates access_count and last_accessed for returned memories. The
 * legacy AFTER UPDATE trigger rebuilt the FTS row for every one of those
 * metadata writes, adding avoidable latency to recall and prompt-submit. FTS
 * content only depends on memories.content, so restrict the update trigger to
 * content changes.
 */
export declare function up(db: {
    exec(sql: string): void;
}): void;
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