Feature/data source transformation in import for self-hosted environments (#6032)

* Introduce data source transformation support for self-hosted environments

* Update changelog

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+#### Added
+
+- Introduced data source transformation support in the import functionality for self-hosted environments
+
 #### Changed
 
 - Increased the numerical precision for cryptocurrency quantities in the holding detail dialog

apps/api/src/interceptors/transform-data-source-in-request/transform-data-source-in-request.interceptor.ts

@@ -69,6 +69,19 @@ export class TransformDataSourceInRequestInterceptor<
           });
         }
       }
+    } else {
+      if (request.body?.activities) {
+        request.body.activities = request.body.activities.map((activity) => {
+          if (DataSource[activity.dataSource]) {
+            return activity;
+          } else {
+            return {
+              ...activity,
+              dataSource: decodeDataSource(activity.dataSource)
+            };
+          }
+        });
+      }
     }
 
     return next.handle();