import type { Knex } from 'knex';
/**
 * Adds optimized index for findUTXOsForTopic queries.
 * This query pattern is: WHERE topic = ? AND spent = false ORDER BY score
 * The composite index (topic, spent, score) enables efficient range scans.
 */
export declare function up(knex: Knex): Promise<void>;
export declare function down(knex: Knex): Promise<void>;
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