refactor: replace ignored numeric literals with constants

src/modules/investments/instruments/bonds/application/bond-market.service.ts

@@ -10,6 +10,7 @@ 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 {
@@ -24,6 +25,8 @@ import {
   BondQuoteResourceDto,
 } from '../presentation/bond.dto';
 
+const ZERO_AMOUNT = 0n;
+
 const PRICE_DECIMAL_PLACES = 9;
 @Injectable()
 export class BondMarketService {
@@ -80,7 +83,7 @@ export function bondQuote(
   const cleanPrice =
     pricePercent !== null &&
     nominal &&
-    decimalFromString(nominal.value).value > 0n ?
+    decimalFromString(nominal.value).value > ZERO_AMOUNT ?
         {
           currency: nominal.currency,
           value: formatDecimal(
@@ -118,7 +121,7 @@ export function bondQuote(
       last?.price && previous?.close ?
           formatDecimal(subtract(decimal(last.price), decimal(previous.close))) :
         null,
-    previousCloseDate: timestamp(previous?.time)?.slice(0, 10) ?? null,
+    previousCloseDate: timestamp(previous?.time)?.slice(ISO_DATE_START, ISO_DATE_LENGTH) ?? null,
     unavailable,
     observedAt,
   };