I have found a problem in FreePBX which I will report under Bugs but I need to urgently fix the db that contains the info for sip_additional.conf

What is the username, password, and database that contains the appropriate info

Creating a blank extn pressing the Submit and updating clears the info in sip_additional.conf except for [] but FreePBX thinks the file is still correct but won’t allow the blank extn to be deleted