c8c7b69ae0
- Add CSRF token per session, validated on all state-changing requests (POST/PUT/DELETE) - Upgrade password hashing from PBKDF2 to bcrypt; auto-upgrade old hashes on login - Add audit_log table tracking all security events (login, export, delete, etc.) - Add /reauth endpoint requiring master password before export - Client-side: re-auth modal before export, X-CSRF-Token header on mutations