refactor: centralize domain values and enforce numeric lint

src/modules/investments/instruments/application/instrument-market.ts

@@ -1,16 +1,21 @@
+import { MILLISECONDS_PER_SECOND } from '../../../../common/time';
 import { ServiceUnavailableException } from '@nestjs/common';
 import type {
   TbankCandle,
   TbankTimestamp,
 } from '../../../../integrations/tbank/tbank.api';
+
+const MOSCOW_OFFSET_MS = 10_800_000;
 export function timestamp(value?: TbankTimestamp): string | null {
   const seconds = Number(value?.seconds);
   return Number.isFinite(seconds) && seconds > 0
-    ? new Date(seconds * 1000).toISOString()
+    ? new Date(seconds * MILLISECONDS_PER_SECOND).toISOString()
     : null;
 }
 export function moscowDay(iso: string): string {
-  return new Date(Date.parse(iso) + 3 * 3_600_000).toISOString().slice(0, 10);
+  return new Date(Date.parse(iso) + MOSCOW_OFFSET_MS)
+    .toISOString()
+    .slice(0, 10);
 }
 export function previousClose(
   candles: TbankCandle[],