public async Task <Guid> CreateSession(Guid?existingId, List <Player> players)
{
var sessionId = existingId ?? Guid.NewGuid();
if (existingId.HasValue)
{
var existingPlayers = await playerRepository.GetPlayers(existingId.Value);
if (existingPlayers != null && existingPlayers.Any())
{
await RemoveStalePlayers(existingId.Value, players, existingPlayers);
}
}
await playerRepository.CreateUpdatePlayers(sessionId, players);
return(sessionId);
}