From 7f0393fbae41d356b805b3bfd3676cbca96c0fa5 Mon Sep 17 00:00:00 2001
From: Thomas Kaul <4159106+dtslvr@users.noreply.github.com>
Date: Sat, 13 Jun 2026 12:43:38 +0200
Subject: [PATCH] Improve processing of historical market data

---
 .../src/services/data-provider/data-provider.service.ts  | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/apps/api/src/services/data-provider/data-provider.service.ts b/apps/api/src/services/data-provider/data-provider.service.ts
index 1ea2d6436..5b54afb0b 100644
--- a/apps/api/src/services/data-provider/data-provider.service.ts
+++ b/apps/api/src/services/data-provider/data-provider.service.ts
@@ -385,10 +385,11 @@ export class DataProviderService implements OnModuleInit {
       response = marketDataByGranularity.reduce((r, marketData) => {
         const { date, marketPrice, symbol } = marketData;
 
-        r[symbol] = {
-          ...(r[symbol] || {}),
-          [format(new Date(date), DATE_FORMAT)]: { marketPrice }
-        };
+        if (!r[symbol]) {
+          r[symbol] = {};
+        }
+
+        r[symbol][format(new Date(date), DATE_FORMAT)] = { marketPrice };
 
         return r;
       }, {});