Improve symbol validation for assets with manual data source

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

@@ -494,7 +494,7 @@ export class ImportService {
 
             if (
               assetProfile.dataSource === DataSource.MANUAL &&
-              Boolean(assetProfile.name)
+              assetProfile.name
             ) {
               existingCustomAssetProfilesOfUser.push({
                 name: assetProfile.name,

apps/api/src/services/data-provider/data-provider.service.ts

@@ -9,7 +9,6 @@ import { PropertyService } from '@ghostfolio/api/services/property/property.serv
 import {
   DEFAULT_CURRENCY,
   DERIVED_CURRENCIES,
-  ghostfolioPrefix,
   PROPERTY_API_KEY_GHOSTFOLIO,
   PROPERTY_DATA_SOURCE_MAPPING
 } from '@ghostfolio/common/config';
@@ -22,7 +21,6 @@ import {
   getStartOfUtcDate,
   isCurrency,
   isDerivedCurrency,
-  isValidCustomAssetProfileSymbol,
   isValidSearchQuery
 } from '@ghostfolio/common/helper';
 import {
@@ -268,15 +266,6 @@ export class DataProviderService implements OnModuleInit {
       });
 
       if (!assetProfiles[assetProfileIdentifier]) {
-        if (
-          dataSource === DataSource.MANUAL &&
-          !isValidCustomAssetProfileSymbol(symbol)
-        ) {
-          throw new Error(
-            `${activityPath}.symbol ("${symbol}") must be a UUID or start with the prefix "${ghostfolioPrefix}_" for the data source ("${DataSource.MANUAL}")`
-          );
-        }
-
         if (
           (dataSource === DataSource.MANUAL && type === 'BUY') ||
           ['FEE', 'INTEREST', 'LIABILITY'].includes(type)