old_contents: from sandman.model import register, activate_admin_classes, Model
  
  class Track(Model):
      __tablename__ = 'Track'
  
      def __str__(self):
          return self.Name
  
  class Artist(Model):
      __tablename__ = 'Artist'
      def __str__(self):
          return self.Name
  
  class Album(Model):
      __tablename__ = 'Album'
      def __str__(self):
          return self.Title
  
  class Playlist(Model):
      __tablename__ = 'Playlist'
      def __str__(self):
          return self.Name
  
  class Genre(Model):
      __tablename__ = 'Genre'
      def __str__(self):
          return self.Name
  
  class MediaType(Model):
      __tablename__ = 'MediaType'
      def __str__(self):
          return self.Name
  
  register((Artist, Album, Playlist, Genre, Track, MediaType))
  activate_admin_classes()
  
new_contents: from sandman.model import register, activate_admin_classes, Model
  
  class Track(Model):
      __tablename__ = 'Track'
  
      def __str__(self):
          return self.Name
  
  class Artist(Model):
      __tablename__ = 'Artist'
      def __str__(self):
          return self.Name
  
  class Album(Model):
      __tablename__ = 'Album'
      def __str__(self):
          return self.Title
  
  class Playlist(Model):
      __tablename__ = 'Playlist'
      def __str__(self):
          return self.Name
  
  class Genre(Model):
      __tablename__ = 'Genre'
      def __str__(self):
          return self.Name
  
  class PlaylistTrack(Model):
      __tablename__ = 'PlaylistTrack'
  
  class MediaType(Model):
      __tablename__ = 'MediaType'
      def __str__(self):
          return self.Name
  
  register((Artist, Album, Playlist, Genre, Track, MediaType, PlaylistTrack))
  activate_admin_classes()
  
subject: add interesting table (used to join playlist and track) for testing