diff --git a/src/backend/model/database/memory/AlbumManager.ts b/src/backend/model/database/memory/AlbumManager.ts
index 08907560..a68f85db 100644
--- a/src/backend/model/database/memory/AlbumManager.ts
+++ b/src/backend/model/database/memory/AlbumManager.ts
@@ -3,6 +3,10 @@ import {SearchQueryDTO} from '../../../../common/entities/SearchQueryDTO';
 import {IAlbumManager} from '../interfaces/IAlbumManager';
 
 export class AlbumManager implements IAlbumManager {
+  onNewDataVersion(): Promise<void> {
+    throw new Error('not supported by memory DB');
+  }
+
   public async onGalleryIndexUpdate(): Promise<void> {
     throw new Error('not supported by memory DB');
   }
diff --git a/src/backend/model/database/memory/IndexingManager.ts b/src/backend/model/database/memory/IndexingManager.ts
index 6637cd6a..b7555ce0 100644
--- a/src/backend/model/database/memory/IndexingManager.ts
+++ b/src/backend/model/database/memory/IndexingManager.ts
@@ -5,6 +5,10 @@ export class IndexingManager implements IIndexingManager {
   IsSavingInProgress: boolean;
   SavingReady: Promise<void>;
 
+  saveToDB(scannedDirectory: ParentDirectoryDTO): Promise<void> {
+    throw new Error('not supported by memory DB');
+  }
+
   indexDirectory(relativeDirectoryName: string): Promise<ParentDirectoryDTO> {
     throw new Error('not supported by memory DB');
   }