Feature/simplify exchange rate service initialization (#1128)

* Simplify initialization

* Update changelog

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Changed
+
+- Simplified the initialization of the exchange rate service
+
 ## 1.177.0 - 04.08.2022
 
 ### Added

apps/api/src/app/app.controller.ts

@@ -1,19 +1,16 @@
 import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data.service';
-import { PrismaService } from '@ghostfolio/api/services/prisma.service';
 import { Controller } from '@nestjs/common';
 
 @Controller()
 export class AppController {
   public constructor(
-    private readonly exchangeRateDataService: ExchangeRateDataService,
-    private readonly prismaService: PrismaService
+    private readonly exchangeRateDataService: ExchangeRateDataService
   ) {
     this.initialize();
   }
 
   private async initialize() {
     try {
-      await this.prismaService.$connect();
       await this.exchangeRateDataService.initialize();
     } catch {}
   }