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根因:服务端用量全按 UTC 预切天,UTC+8 用户在中国 0-8 点时 UTC 还是前一天, 「今天」就显示前一天数据。 改法(用户拍板:小时桶+查询带时区偏移): - migration 000017 `usage_hourly`(UTC 纪元小时整数桶,稀疏存储,空小时不落行)。 - ReportUsage 同时累加 usage_hourly(按 windowEnd 的 UTC 小时);usage_daily 保留作配额/今日。 - `UsageCurve(days, offsetMin)`:读 UTC 小时桶,按客户端时区偏移**重新聚合成本地日**曲线。 - `/v1/usage?tz_offset=分钟`;客户端 `usage()` 带 `DateTime.now().timeZoneOffset.inMinutes`。 - 客户端早已「取曲线最后一点当今日」,故只改服务端聚合 + 带偏移即可。 测试:store 时区分桶证明（UTC 18:00 在 UTC vs UTC+8 落不同本地日,锁住 bug 修复）+ migration v17 + usage_hourly 表;集成测试改喂 hourly;全量 go/flutter test 绿。 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>