Migrate account with ring.db should back-up conversations and avatars

Running Fedora 28 with latest repository update from https://dl.ring.cx/ring-nightly/fedora_28/ring-nightly.repo

Exported my account to .gz. Saved /home/user/.config/ring & /home/user/.local/share/gnome-ring.

Finally I imported all of them to my freshly installed new system.

My account & settings are there. My contacts & conversations are all gone.

I noticed that ring.db contains all of my messages -> checked with sqlite3 ~/.local/share/gnome-ring/ring.db

and /home/user/.local/share/gnome-ring/peer_profiles contains all of my contacts.

But nothing is displayed.

Any idea how to get my data visible again?