fix: 统一时间戳为带时区的 UTC datetime，修复跨时区部署时间显示错误#70
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ZhengZhenyu merged 3 commits intoopensourceways:mainfrom Feb 24, 2026
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fix: 统一时间戳为带时区的 UTC datetime，修复跨时区部署时间显示错误#70ZhengZhenyu merged 3 commits intoopensourceways:mainfrom
ZhengZhenyu merged 3 commits intoopensourceways:mainfrom
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- 新增 app/core/timezone.py：提供 utc_now()、get_app_tz()、to_app_tz() 工具函数 - 新增 APP_TIMEZONE 配置项（默认 Asia/Shanghai），控制 ICS/邮件等服务端输出的本地化时区 - 将所有模型的 DateTime 列改为 DateTime(timezone=True)，default 改用 utc_now - 替换所有 datetime.utcnow() 直接调用为 utc_now()（含 services、api、security） - ICS 日历改为标准 UTC Z 格式（DTSTART:20240115T103000Z） - docker-compose.yml 添加 TZ 环境变量与 APP_TIMEZONE 联动 - 生成 Alembic 迁移 986ddbdad1d7
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- 删除迁移中 _alembic_tmp_campaign_contacts 的 drop/create 操作， 避免全新数据库执行 alembic upgrade head 时报 no such table 错误 - timezone.py / ics.py：将 timezone as _tz / _tz.utc 改为 datetime.UTC (ruff UP017) - auth.py、community_dashboard.py、ics.py：修正 import 块排序 (ruff I001)
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SQLite 的 DateTime(timezone=True) 在某些环境下读取时返回 naive datetime， 与 utc_now()（offset-aware）比较会引发 TypeError。 在 is_expired 中防御性处理：若 expires_at 无 tzinfo，先附加 UTC 再比较。
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