public async Task <IEnumerable <CharacterHeader> > GetList(int projectId,
                                                            [FromUri]
                                                            DateTime?modifiedSince = null)
 {
     return((await CharacterRepository.GetCharacterHeaders(projectId, modifiedSince)).Select(
                character =>
                new CharacterHeader
     {
         CharacterId = character.CharacterId,
         UpdatedAt = character.UpdatedAt,
         IsActive = character.IsActive,
         CharacterLink =
             $"/x-game-api/{projectId}/characters/{character.CharacterId}/",
     }));
 }