/**
 * Migration 039: Add extended execution stats to phase_timings table.
 *
 * Adds cache token breakdown, cost, turn count, and API duration
 * to capture rich telemetry from agent CLI output.
 */
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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