private void RecordDeposit(Guid recipientId, decimal amount, DateTime timestamp)
{
CurrentBalance += amount;
var record = new AccountLog(timestamp, amount, CurrentBalance, recipientId);
History.Add(record);
}
private void RecordWithdrawal(Guid accountId, decimal amount, DateTime timestamp)
{
CurrentBalance -= amount;
var record = new AccountLog(timestamp, -amount, CurrentBalance, accountId);
History.Add(record);
}