refactor: replace ignored numeric literals with constants

src/modules/investments/instruments/stocks/application/stock-market.service.ts

@@ -7,6 +7,7 @@ import {
   multiply,
   subtract,
 } from '../../../../../common/decimal';
+import { ISO_DATE_LENGTH, ISO_DATE_START } from '../../../../../common/time';
 import { decimal } from '../../../../../integrations/tbank/decimal';
 import { CandleService } from '../../application/candle.service';
 import {
@@ -20,6 +21,8 @@ import {
   StockQuoteResourceDto,
 } from '../presentation/stock.dto';
 
+const ZERO_AMOUNT = 0n;
+
 const CHANGE_PERCENT_DECIMAL_PLACES = 6;
 @Injectable()
 export class StockMarketService {
@@ -90,7 +93,7 @@ export function stockQuote(
     price,
     priceAt,
     tradingStatus,
-    previousCloseDate: timestamp(previous?.time)?.slice(0, 10) ?? null,
+    previousCloseDate: timestamp(previous?.time)?.slice(ISO_DATE_START, ISO_DATE_LENGTH) ?? null,
     previousClose: previousPrice,
     change:
       difference && currency ?
@@ -99,7 +102,7 @@ export function stockQuote(
     changePercent:
       difference &&
       previousPrice &&
-      decimalFromString(previousPrice.value).value > 0n ?
+      decimalFromString(previousPrice.value).value > ZERO_AMOUNT ?
           formatDecimal(
             divide(
               multiply(difference, decimalFromString('100')),