- id
- name
tie to authorization/authentication
- id
- uploader (user)
- uploaded (datetime)
- copyright_holder ???
- copyright_year
- url
- picture
- media_type
- thumbnail
- derived_picture (picture)
- source_picture (picture)
- relation [improvement, variant, composition]
- note
- picture
- user
- tag (string or fk?)
- picture
- user
- key
- value
- rating
- picture
- user
- created
- comment
- alert
- Support for searching by image similarity? I imagine that means storing data generated by processing the images, and then finding similar data.