pub struct Artwork {
    /// artwork id
    id: Option<usize>,
    /// name of the artwork
    title: Option<String>,
    /// description of the artwork
    description: Option<String>,
    /// source url of the artwork
    url_source: Option<String>,
    /// id of the artist
    artist_id: usize,
    /// ids of files
    files: Vec<usize>,
}