public async ValueTask Handle(DefineAccount command, CancellationToken cancellationToken = default)
{
var optionalChart = await _chartOfAccounts.GetOptional(cancellationToken);
var chart = optionalChart.HasValue ? optionalChart.Value : ChartOfAccounts.Factory();
chart.DefineAccount(new AccountName(command.AccountName !), new AccountNumber(command.AccountNumber));
if (!optionalChart.HasValue)
{
_chartOfAccounts.Add(chart);
}
}