Use USDT for historical NIM prices from CryptoCompare

By default, CryptoCompare calculates the NIM price in USD via BTC sats. But it doesn't use decimals for sats, so when the NIM price is 3 sats (rounded), then the historical prices follow Bitcoin's exactly. Using USDT as the target currency (vsCurrency) works because NIM has a direct pair with USDT on a major exchange, so CryptoCompare can use that directly.

Author: sisou

src/fiat-api/FiatApi.ts

@@ -577,6 +577,9 @@ export async function getHistoricExchangeRatesByRange<P extends Provider = Provi
     let providerHistoricRatesPromise: Promise<Array<[number, number]>>;
     switch (provider) {
         case Provider.CryptoCompare:
+            if (cryptoCurrency === CryptoCurrency.NIM && vsCurrency === FiatCurrency.USD) {
+                vsCurrency = CryptoCurrency.USDT;
+            }
             providerHistoricRatesPromise = (async () => {
                 let result: Array<[number, number]> = [];
                 let batchToTs = to; // last timestamp to include in current batch; inclusive