| Data | Purpose | Retention |
|---|---|---|
| Email, name, avatar | Account & authentication | Until account deletion |
| Nickname, avatar | Community features | Until account deletion |
| Device info, IP, FCM token | Service, security, push | Until deletion or token expiry |
| Habits / check-ins / stats | Core functionality | Until account deletion |
You have the right to refuse, but the Service may not function without these basic items.