public async Task <CompetitionResponse> AddCompetition(Guid userId, CompetitionRequest request)
        {
            var challenge   = _mappingService.CreateChallenge(request);
            var competition = _mappingService.CreateCompetition(challenge.ChallengeId, request);

            _challengeRepo.Create(challenge);
            _competitionRepo.Create(competition);
            _participantRepo.Create(new Participant(userId, competition.CompetitionId));
            _adminRepo.Create(new Admin(userId, competition.CompetitionId));
            await _competitionRepo.Save();

            return(new CompetitionResponse(competition, true, userId));
        }