Cluster-secret holder could POST a backup with their own admin key to
/api/backup/import, replacing all users — privilege escalation from
cluster-auth to admin. Also, Kuma imports produced zero users but
ImportWipe unconditionally deleted the users table — locking out all
accounts until restart reseeded UPTOP_ADMIN_KEY.
- Server handlers strip data.Users (set nil) before calling ImportData
- ImportData only wipes+replaces users when data.Users != nil
- New ImportWipeUsers dialect method separates user wipe from data wipe
- CLI restore (main.go) unchanged — full import still replaces users
lerko
4328d25f22
