Bugfix/fix performance chart (#119)

* Fix value of performance chart

* Update changelog

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Introduced a user service implemented as an observable store (single source of truth for state)
 
+### Fixed
+
+- Fixed the performance chart by considering the investment
+
 ## 1.7.0 - 22.05.2021
 
 ### Changed

apps/api/src/app/portfolio/portfolio.service.ts

@@ -158,8 +158,8 @@ export class PortfolioService {
         return {
           date: format(parseISO(portfolioItem.date), 'yyyy-MM-dd'),
           grossPerformancePercent: portfolioItem.grossPerformancePercent,
-          marketPrice: portfolioItem.value || null,
+          marketPrice: portfolioItem.value ?? null,
-          value: portfolioItem.value || null
+          value: portfolioItem.value - portfolioItem.investment ?? null
         };
       });
   }