- Use `user` everywhere, instead of sometimes `loggedUser`
- Delay the instantiation of some variables: no need to perform SQL queries for
nothing.
- Remove a SQL query getting the whole user struct when only user.ID is used.
When you download/save proxified media, the original filename is lost. That
information could be retained by passing a header `Content-Disposition: inline;
filename="ORIGNAL_FILENAME.EXT"` when serving the media file. The requested URL
would still be obfuscated, but if the client downloads the file it'll use that
original filename.
