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- 新增 GET /api/v1/compare/stats(comparison_record: status=success 计数 + saved_amount_cents 求和),供「我的」页省钱战绩卡比价口径(完成比价 + 累计发现可省),不要求下单 - savings.py 停用 demo seeder(ensure_seeded 等移除),只计真实 source='compare';简化 beat_percent 为 compare-only - 测试: compare/stats 用例 + savings/welfare 改纯真实语义 - 文档: 新增 compare-stats.md;更新 savings-battle.md / savings_record.md / comparison_record.md / API README Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>