默认会话时区        : ('+08:00', '+08:00', datetime.datetime(2026, 9, 20, 1, 44, 32), datetime.date(2026, 9, 20))
模拟 sqlx(+00:00)   : ('+00:00', datetime.datetime(2026, 9, 19, 17, 44, 32), datetime.date(2026, 9, 19))
UTC 会话下 today    : 6000 (服务实测返回 6000 ✓)
UTC 会话下 month    : 6990 (服务实测返回 6990 ✓)
+08:00 会话读 start_time : ((10, 1, datetime.datetime(2026, 9, 20, 10, 0)), (11, 1, datetime.datetime(2026, 9, 19, 10, 0)), (12, 2, datetime.datetime(2026, 9, 20, 10, 0)))
+00:00 会话读 start_time : ((10, 1, datetime.datetime(2026, 9, 20, 2, 0)), (11, 1, datetime.datetime(2026, 9, 19, 2, 0)), (12, 2, datetime.datetime(2026, 9, 20, 2, 0)))