Change all license headers to comply with REUSE specification.
Fix#16132
Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>
* delete attachments from the database and file system
* add migration
* fix import statements
* fix package name
* remove conditional should in case the confi has been changed and the server restarted
* simplify deletion of attachments in DB
* fix CI build
* fix review
* add copyright in the proper place
* fix review