Exchange Rate

public class ExchangeRate
{
    public const int MIN_RATE = 0;
    public const int MAX_RATE = 99999999;
    
    public int Id { get; }
    public Currency BaseCurrency { get; }
    public Currency TargetCurrency { get; }
    public float Rate { get; }
}

interface ExchangeRateDTO {
  Id: number;
  BaseCurrency: Currency;
  TargetCurrency: Currency;
  Rate: number;
}

{
  "Id": 1,
  "BaseCurrency": {
    "ID": 1,
    "Code": "USD",
    "FullName": "US Dollar",
    "Sign": "$"
  },
  "TargetCurrency": {
    "ID": 2,
    "Code": "EUR",
    "FullName": "Euro",
    "Sign": "€"
  },
  "Rate": 0.85
}

interface AddExchangeRateDTO {
  BaseCurrencyCode: string;
  TargetCurrencyCode: string;
  Rate: number;
}

{
  "BaseCurrencyCode": "USD",
  "TargetCurrencyCode": "EUR",
  "Rate": 0.85
}

interface UpdateRateDTO {
  Rate: number;
}

{
  "Rate": 0.87
}

{
  "Id": 2,
  "BaseCurrency": {
    "ID": 1,
    "Code": "USD",
    "FullName": "US Dollar",
    "Sign": "$"
  },
  "TargetCurrency": {
    "ID": 3,
    "Code": "GBP",
    "FullName": "British Pound",
    "Sign": "£"
  },
  "Rate": 0.73
}

{
  "Id": 3,
  "BaseCurrency": {
    "ID": 2,
    "Code": "EUR",
    "FullName": "Euro",
    "Sign": "€"
  },
  "TargetCurrency": {
    "ID": 4,
    "Code": "RUB",
    "FullName": "Российский рубль",
    "Sign": "₽"
  },
  "Rate": 105.50
}

{
  "BaseCurrencyCode": "GBP",
  "TargetCurrencyCode": "JPY",
  "Rate": 185.25
}

{
  "Rate": 186.50
}