Attachment responsible uplaoder

Person responsible for the provided data needs to logged/stored.

Required:

• As a system administrator we want to be able to retrace the uploader of a object/file.
• Service and public user must not have the possibility to view the uploader

Three Ideas two solve this:

1. Store the uploader within the metadata of the object and prohibit access for common user
2. Store the uploader in the sms-backend data model
3. Log uploader + file id and properly take care of the logs