refactor: centralize provider projections

src/modules/investments/instruments/application/candle.service.ts

@@ -5,10 +5,8 @@ import {
 } from '@nestjs/common';
 import { randomUUID } from 'node:crypto';
 
-import { formatDecimal } from '../../../../common/decimal';
 import { StructuredLogger } from '../../../../common/logging/structured-logger.service';
 import { MILLISECONDS_PER_DAY } from '../../../../common/time';
-import { decimal } from '../../../../integrations/tbank/decimal';
 import { isTbankErrorCode, TbankErrorCode } from '../../../../integrations/tbank/tbank-error-code';
 import {
   TbankAccessService,
@@ -26,6 +24,7 @@ import {
 } from '../domain/candle-coverage';
 import { InstrumentErrorCode } from '../domain/instrument-error-code';
 import { CandleRepository } from '../infrastructure/candle.repository';
+import { toSavedCandle } from '../infrastructure/tbank-candle.mapper';
 import { CatalogEnrichmentService } from './catalog-enrichment.service';
 import { timestamp } from './instrument-market';
 
@@ -413,17 +412,7 @@ export class CandleService {
         window.from,
         new Date(Math.min(window.to.valueOf(), now.valueOf())),
       );
-      const rows = candles.flatMap((candle) => {
-        const time = timestamp(candle.time);
-        if (!time || !candle.close) throw new Error('Invalid candle response');
-        return [
-          {
-            time,
-            close: formatDecimal(decimal(candle.close)),
-            isComplete: candle.isComplete === true,
-          },
-        ];
-      });
+      const rows = candles.map(toSavedCandle);
       if (!(await this.repository.stage(attempt, window, rows, now))) {
         return false;
       }