refactor: replace ignored numeric literals with constants

src/modules/investments/operations/infrastructure/brokerage-operation.mapper.ts

@@ -10,6 +10,8 @@ import {
   OperationCategory,
 } from '../presentation/brokerage-operation.dto';
 
+const MISSING_TIMESTAMP_COMPONENT = 0;
+
 const NANOSECONDS_PER_MILLISECOND = 1_000_000;
 
 const types: Record<string, OperationCategory> = {
@@ -89,7 +91,7 @@ export function operationTimestamp(
   value: undefined | { nanos?: number; seconds?: number | string },
 ) {
   return new Date(
-    Number(value?.seconds ?? 0) * MILLISECONDS_PER_SECOND +
-    Math.floor((value?.nanos ?? 0) / NANOSECONDS_PER_MILLISECOND),
+    Number(value?.seconds ?? MISSING_TIMESTAMP_COMPONENT) * MILLISECONDS_PER_SECOND +
+    Math.floor((value?.nanos ?? MISSING_TIMESTAMP_COMPONENT) / NANOSECONDS_PER_MILLISECOND),
   );
 }