Inability to delete the history of messages

Hello. Already raised this topic, I want to voice once again, in Jami, even on the latest version, it is impossible to clear the history of messages. I set up two phones with JAMI added the contacts of each, after several messages I cleaned the story on two phones and after rebooting on both phones, the entire message history recovered. In addition, even the complete removal of JAMI from the phones and the subsequent restoration of the account from the backup and search for contact through a public key, instantly restored the entire correspondence history from the moment of registration of the account. This is a very significant remark on security, because In some cases, confidential information deleted by the user can be restored by getting the phone and rebooting it. Please try to solve the issue of cleaning the history of messages, this is one of the very important issues. Respectfully to you.