I think that phone numbers are the only sensitive data yes. Not sure the logs are still useful.

@Fla In Teleports, I don't see a search box where I can search for groups. I can only enter a contact by phone number. Or is the option hidden somewhere? The main screen is blank with a menu in the left top corner, with saved messages, contacts, settings, night mode and about. I could't find a manual for Teleports. I've gone through the menu items, but don't see how?

Okay, I will contact @nanu-c about website. I will mark this question as solved. Thanks!