public async Task <List <AccountFlagType> > GetNotSetListAsync(Guid accountId, CancellationToken ct)
{
var allFlags = EnumsExtensions.GetValues <AccountFlagType>();
var setFlags = await _storage.AccountFlags
.AsNoTracking()
.Where(x => x.AccountId == accountId)
.Select(x => x.Type)
.ToListAsync(ct);
return(allFlags
.Except(setFlags)
.ToList());
}