记下预估压力，回看真实感受。差值 Δ，是大脑错估的部分。
· 我的数据存在哪里？
只存在你自己的手机上。Delta 没有账号、没有服务器、不发出任何网络请求。
备份文件由你自己导出、自己保管。
· 删错了怎么办？
删除的记录会先进「草稿箱」，可以在 设置 → 草稿箱 里找回。
· 换手机怎么迁移？
旧手机：设置 → 数据 → 备份，把备份文件发给自己；新手机：同一入口导入即可。
使用问题或建议，写信给：xinyx067@gmail.com
Delta 是一件自我观察的工具，不提供诊断或治疗，也不替代专业的心理帮助。
Log your predicted stress, revisit the real feeling.
The gap (Δ) is what your brain misjudged.
· Where is my data stored?
Only on your own phone. Delta has no accounts, no servers, and makes zero network requests.
Backups are exported and kept by you.
· Deleted something by mistake?
Deleted records go to the drafts box first. Recover them in Settings → Drafts.
· Moving to a new phone?
Old phone: Settings → Data → Backup, send the file to yourself. New phone: import it at the same place.
Questions or suggestions: xinyx067@gmail.com