I'm looking for a database (relational would be preferred, but NoSQL is also okay) which can be run without an admin user. I want to setup the database with an admin user, but then delete the admin user forever and run the database only with non-admin users. Is there anything like that for Postgres, MongoDB, MySQL, etc.?
EDIT: The goal is to make the database 100% safe from unrestricted deletions. The normal users should only be able to insert data, deletions and edits should never be possible, also not for the admin.
Thanks for the help!