diff --git a/src/backend/model/ObjectManagers.ts b/src/backend/model/ObjectManagers.ts
index 83faa850..1729e4ed 100644
--- a/src/backend/model/ObjectManagers.ts
+++ b/src/backend/model/ObjectManagers.ts
@@ -12,6 +12,8 @@ import {LocationManager} from './database/LocationManager';
 import {IAlbumManager} from './database/interfaces/IAlbumManager';
 import {JobManager} from './jobs/JobManager';
 import {IPreviewManager} from './database/interfaces/IPreviewManager';
+import {ParentDirectoryDTO} from '../../common/entities/DirectoryDTO';
+import {IObjectManager} from './database/interfaces/IObjectManager';
 
 const LOG_TAG = '[ObjectManagers]';
 
@@ -19,6 +21,7 @@ export class ObjectManagers {
 
   private static instance: ObjectManagers = null;
 
+  private readonly managers: IObjectManager[];
   private galleryManager: IGalleryManager;
   private userManager: IUserManager;
   private searchManager: ISearchManager;
@@ -32,12 +35,20 @@ export class ObjectManagers {
   private albumManager: IAlbumManager;
 
 
+  constructor() {
+    this.managers = [];
+  }
+
   get VersionManager(): IVersionManager {
     return this.versionManager;
   }
 
   set VersionManager(value: IVersionManager) {
+    if (this.versionManager) {
+      this.managers.splice(this.managers.indexOf(this.versionManager), 1);
+    }
     this.versionManager = value;
+    this.managers.push(this.versionManager);
   }
 
   get LocationManager(): LocationManager {
@@ -45,7 +56,11 @@ export class ObjectManagers {
   }
 
   set LocationManager(value: LocationManager) {
+    if (this.locationManager) {
+      this.managers.splice(this.managers.indexOf(this.locationManager), 1);
+    }
     this.locationManager = value;
+    this.managers.push(this.locationManager);
   }
 
   get AlbumManager(): IAlbumManager {
@@ -53,7 +68,11 @@ export class ObjectManagers {
   }
 
   set AlbumManager(value: IAlbumManager) {
+    if (this.albumManager) {
+      this.managers.splice(this.managers.indexOf(this.albumManager), 1);
+    }
     this.albumManager = value;
+    this.managers.push(this.albumManager);
   }
 
   get PersonManager(): IPersonManager {
@@ -61,14 +80,23 @@ export class ObjectManagers {
   }
 
   set PersonManager(value: IPersonManager) {
+    if (this.personManager) {
+      this.managers.splice(this.managers.indexOf(this.personManager), 1);
+    }
     this.personManager = value;
+    this.managers.push(this.personManager);
   }
+
   get PreviewManager(): IPreviewManager {
     return this.previewManager;
   }
 
   set PreviewManager(value: IPreviewManager) {
+    if (this.previewManager) {
+      this.managers.splice(this.managers.indexOf(this.previewManager), 1);
+    }
     this.previewManager = value;
+    this.managers.push(this.previewManager);
   }
 
   get IndexingManager(): IIndexingManager {
@@ -76,7 +104,11 @@ export class ObjectManagers {
   }
 
   set IndexingManager(value: IIndexingManager) {
+    if (this.indexingManager) {
+      this.managers.splice(this.managers.indexOf(this.indexingManager), 1);
+    }
     this.indexingManager = value;
+    this.managers.push(this.indexingManager);
   }
 
 
@@ -85,7 +117,11 @@ export class ObjectManagers {
   }
 
   set GalleryManager(value: IGalleryManager) {
+    if (this.galleryManager) {
+      this.managers.splice(this.managers.indexOf(this.galleryManager), 1);
+    }
     this.galleryManager = value;
+    this.managers.push(this.galleryManager);
   }
 
   get UserManager(): IUserManager {
@@ -93,7 +129,11 @@ export class ObjectManagers {
   }
 
   set UserManager(value: IUserManager) {
+    if (this.userManager) {
+      this.managers.splice(this.managers.indexOf(this.userManager), 1);
+    }
     this.userManager = value;
+    this.managers.push(this.userManager);
   }
 
   get SearchManager(): ISearchManager {
@@ -101,7 +141,11 @@ export class ObjectManagers {
   }
 
   set SearchManager(value: ISearchManager) {
+    if (this.searchManager) {
+      this.managers.splice(this.managers.indexOf(this.searchManager), 1);
+    }
     this.searchManager = value;
+    this.managers.push(this.searchManager);
   }
 
   get SharingManager(): ISharingManager {
@@ -109,7 +153,11 @@ export class ObjectManagers {
   }
 
   set SharingManager(value: ISharingManager) {
+    if (this.sharingManager) {
+      this.managers.splice(this.managers.indexOf(this.sharingManager), 1);
+    }
     this.sharingManager = value;
+    this.managers.push(this.sharingManager);
   }
 
   get JobManager(): IJobManager {
@@ -117,7 +165,11 @@ export class ObjectManagers {
   }
 
   set JobManager(value: IJobManager) {
+    if (this.jobManager) {
+      this.managers.splice(this.managers.indexOf(this.jobManager), 1);
+    }
     this.jobManager = value;
+    this.managers.push(this.jobManager);
   }
 
   public static getInstance(): ObjectManagers {
@@ -128,6 +180,7 @@ export class ObjectManagers {
   }
 
   public static async reset(): Promise<void> {
+    Logger.silly(LOG_TAG, 'Object manager reset begin');
     if (ObjectManagers.getInstance().IndexingManager &&
       ObjectManagers.getInstance().IndexingManager.IsSavingInProgress) {
       await ObjectManagers.getInstance().IndexingManager.SavingReady;
@@ -140,7 +193,6 @@ export class ObjectManagers {
     Logger.debug(LOG_TAG, 'Object manager reset');
   }
 
-
   public static async InitMemoryManagers(): Promise<void> {
     await ObjectManagers.reset();
     this.initManagers('memory');
@@ -168,4 +220,17 @@ export class ObjectManagers {
     ObjectManagers.getInstance().LocationManager = new LocationManager();
   }
 
+  public async onDataChange(changedDir: ParentDirectoryDTO = null): Promise<void> {
+    await this.VersionManager.onNewDataVersion(changedDir);
+
+    for (const manager of this.managers) {
+      if (manager === this.versionManager) {
+        continue;
+      }
+      if (manager.onNewDataVersion) {
+        await manager.onNewDataVersion(changedDir);
+      }
+    }
+  }
+
 }
diff --git a/src/backend/model/database/LocationManager.ts b/src/backend/model/database/LocationManager.ts
index 5045459a..d2031098 100644
--- a/src/backend/model/database/LocationManager.ts
+++ b/src/backend/model/database/LocationManager.ts
@@ -2,8 +2,12 @@ import {GPSMetadata} from '../../../common/entities/PhotoDTO';
 import * as NodeGeocoder from 'node-geocoder';
 import {LocationLookupException} from '../../exceptions/LocationLookupException';
 import {LRU} from '../../../common/Utils';
+import {IObjectManager} from './interfaces/IObjectManager';
+import {ParentDirectoryDTO} from '../../../common/entities/DirectoryDTO';
 
-export class LocationManager {
+export class LocationManager implements IObjectManager {
+  // onNewDataVersion only need for TypeScript, otherwise the interface is not implemented.
+  readonly onNewDataVersion: (changedDir?: ParentDirectoryDTO) => Promise<void>;
   readonly geocoder: NodeGeocoder.Geocoder;
   cache = new LRU<GPSMetadata>(100);
 
diff --git a/src/backend/model/database/interfaces/IAlbumManager.ts b/src/backend/model/database/interfaces/IAlbumManager.ts
index f031c10f..cf84d7ea 100644
--- a/src/backend/model/database/interfaces/IAlbumManager.ts
+++ b/src/backend/model/database/interfaces/IAlbumManager.ts
@@ -1,7 +1,8 @@
 import {SearchQueryDTO} from '../../../../common/entities/SearchQueryDTO';
 import {AlbumBaseDTO} from '../../../../common/entities/album/AlbumBaseDTO';
+import {IObjectManager} from './IObjectManager';
 
-export interface IAlbumManager {
+export interface IAlbumManager extends IObjectManager{
   /**
    * Creates a saved search type of album
    */
@@ -27,5 +28,5 @@ export interface IAlbumManager {
   /**
    * Updates previews and album counts
    */
-  onGalleryIndexUpdate(): Promise<void>;
+  onNewDataVersion(): Promise<void>;
 }
diff --git a/src/backend/model/database/interfaces/IGalleryManager.ts b/src/backend/model/database/interfaces/IGalleryManager.ts
index 3f61ceae..14c163ba 100644
--- a/src/backend/model/database/interfaces/IGalleryManager.ts
+++ b/src/backend/model/database/interfaces/IGalleryManager.ts
@@ -1,6 +1,7 @@
 import {ParentDirectoryDTO} from '../../../../common/entities/DirectoryDTO';
+import {IObjectManager} from './IObjectManager';
 
-export interface IGalleryManager {
+export interface IGalleryManager extends IObjectManager {
   listDirectory(relativeDirectoryName: string,
                 knownLastModified?: number,
                 knownLastScanned?: number): Promise<ParentDirectoryDTO>;
diff --git a/src/backend/model/database/interfaces/IIndexingManager.ts b/src/backend/model/database/interfaces/IIndexingManager.ts
index edf0b753..f7a06680 100644
--- a/src/backend/model/database/interfaces/IIndexingManager.ts
+++ b/src/backend/model/database/interfaces/IIndexingManager.ts
@@ -1,10 +1,13 @@
 import {ParentDirectoryDTO} from '../../../../common/entities/DirectoryDTO';
+import {IObjectManager} from './IObjectManager';
 
-export interface IIndexingManager {
+export interface IIndexingManager extends IObjectManager {
   SavingReady: Promise<void>;
   IsSavingInProgress: boolean;
 
   indexDirectory(relativeDirectoryName: string): Promise<ParentDirectoryDTO>;
 
   resetDB(): Promise<void>;
+
+  saveToDB(scannedDirectory: ParentDirectoryDTO): Promise<void>;
 }
diff --git a/src/backend/model/database/interfaces/IJobManager.ts b/src/backend/model/database/interfaces/IJobManager.ts
index 867d6f32..ec33990b 100644
--- a/src/backend/model/database/interfaces/IJobManager.ts
+++ b/src/backend/model/database/interfaces/IJobManager.ts
@@ -1,7 +1,8 @@
 import {JobProgressDTO} from '../../../../common/entities/job/JobProgressDTO';
 import {JobDTO} from '../../../../common/entities/job/JobDTO';
+import {IObjectManager} from './IObjectManager';
 
-export interface IJobManager {
+export interface IJobManager extends IObjectManager {
 
 
   run(jobId: string, config: any, soloRun: boolean, allowParallelRun: boolean): Promise<void>;
diff --git a/src/backend/model/database/interfaces/IObjectManager.ts b/src/backend/model/database/interfaces/IObjectManager.ts
new file mode 100644
index 00000000..37eff20a
--- /dev/null
+++ b/src/backend/model/database/interfaces/IObjectManager.ts
@@ -0,0 +1,5 @@
+import {ParentDirectoryDTO} from '../../../../common/entities/DirectoryDTO';
+
+export interface IObjectManager {
+  onNewDataVersion?: (changedDir?: ParentDirectoryDTO) => Promise<void>;
+}
diff --git a/src/backend/model/database/interfaces/IPersonManager.ts b/src/backend/model/database/interfaces/IPersonManager.ts
index 4c9f0e29..13c17520 100644
--- a/src/backend/model/database/interfaces/IPersonManager.ts
+++ b/src/backend/model/database/interfaces/IPersonManager.ts
@@ -1,14 +1,13 @@
 import {PersonEntry} from '../sql/enitites/PersonEntry';
 import {PersonDTO} from '../../../../common/entities/PersonDTO';
+import {IObjectManager} from './IObjectManager';
 
-export interface IPersonManager {
+export interface IPersonManager extends IObjectManager {
   getAll(): Promise<PersonEntry[]>;
 
   get(name: string): Promise<PersonEntry>;
 
   saveAll(names: string[]): Promise<void>;
 
-  onGalleryIndexUpdate(): Promise<void>;
-
   updatePerson(name: string, partialPerson: PersonDTO): Promise<PersonEntry>;
 }
diff --git a/src/backend/model/database/interfaces/IPreviewManager.ts b/src/backend/model/database/interfaces/IPreviewManager.ts
index ac95eebd..a9a2f441 100644
--- a/src/backend/model/database/interfaces/IPreviewManager.ts
+++ b/src/backend/model/database/interfaces/IPreviewManager.ts
@@ -1,7 +1,8 @@
 import {SavedSearchDTO} from '../../../../common/entities/album/SavedSearchDTO';
 import {PreviewPhotoDTO} from '../../../../common/entities/PhotoDTO';
+import {IObjectManager} from './IObjectManager';
 
-export interface IPreviewManager {
+export interface IPreviewManager extends IObjectManager {
   getPreviewForDirectory(dir: { id: number, name: string, path: string }): Promise<PreviewPhotoDTOWithID>;
 
   getAlbumPreview(album: SavedSearchDTO): Promise<PreviewPhotoDTOWithID>;
diff --git a/src/backend/model/database/interfaces/ISearchManager.ts b/src/backend/model/database/interfaces/ISearchManager.ts
index 37272cfe..1d905bc6 100644
--- a/src/backend/model/database/interfaces/ISearchManager.ts
+++ b/src/backend/model/database/interfaces/ISearchManager.ts
@@ -2,8 +2,9 @@ import {AutoCompleteItem} from '../../../../common/entities/AutoCompleteItem';
 import {SearchResultDTO} from '../../../../common/entities/SearchResultDTO';
 import {SearchQueryDTO, SearchQueryTypes} from '../../../../common/entities/SearchQueryDTO';
 import {PhotoDTO} from '../../../../common/entities/PhotoDTO';
+import {IObjectManager} from './IObjectManager';
 
-export interface ISearchManager {
+export interface ISearchManager  extends IObjectManager{
   autocomplete(text: string, type: SearchQueryTypes): Promise<AutoCompleteItem[]>;
 
   search(query: SearchQueryDTO): Promise<SearchResultDTO>;
diff --git a/src/backend/model/database/interfaces/ISharingManager.ts b/src/backend/model/database/interfaces/ISharingManager.ts
index 85823bc6..ffe6be87 100644
--- a/src/backend/model/database/interfaces/ISharingManager.ts
+++ b/src/backend/model/database/interfaces/ISharingManager.ts
@@ -1,6 +1,7 @@
 import {SharingDTO} from '../../../../common/entities/SharingDTO';
+import {IObjectManager} from './IObjectManager';
 
-export interface ISharingManager {
+export interface ISharingManager extends IObjectManager {
   findOne(filter: any): Promise<SharingDTO>;
 
   createSharing(sharing: SharingDTO): Promise<SharingDTO>;
diff --git a/src/backend/model/database/interfaces/IUserManager.ts b/src/backend/model/database/interfaces/IUserManager.ts
index d190ad65..6f642299 100644
--- a/src/backend/model/database/interfaces/IUserManager.ts
+++ b/src/backend/model/database/interfaces/IUserManager.ts
@@ -1,6 +1,7 @@
 import {UserDTO, UserRoles} from '../../../../common/entities/UserDTO';
+import {IObjectManager} from './IObjectManager';
 
-export interface IUserManager {
+export interface IUserManager extends IObjectManager {
   findOne(filter: any): Promise<UserDTO>;
 
   find(filter: any): Promise<UserDTO[]>;
diff --git a/src/backend/model/database/interfaces/IVersionManager.ts b/src/backend/model/database/interfaces/IVersionManager.ts
index 6360d4b4..76ecea25 100644
--- a/src/backend/model/database/interfaces/IVersionManager.ts
+++ b/src/backend/model/database/interfaces/IVersionManager.ts
@@ -1,5 +1,5 @@
-export interface IVersionManager {
-  getDataVersion(): Promise<string>;
+import {IObjectManager} from './IObjectManager';
 
-  updateDataVersion(): Promise<void>;
+export interface IVersionManager extends IObjectManager {
+  getDataVersion(): Promise<string>;
 }
diff --git a/src/backend/model/database/sql/AlbumManager.ts b/src/backend/model/database/sql/AlbumManager.ts
index d9f8a936..3da855c4 100644
--- a/src/backend/model/database/sql/AlbumManager.ts
+++ b/src/backend/model/database/sql/AlbumManager.ts
@@ -48,7 +48,7 @@ export class AlbumManager implements IAlbumManager {
         'directory.path']).getMany();
   }
 
-  public async onGalleryIndexUpdate(): Promise<void> {
+  public async onNewDataVersion(): Promise<void> {
     await this.updateAlbums();
   }
 
diff --git a/src/backend/model/database/sql/GalleryManager.ts b/src/backend/model/database/sql/GalleryManager.ts
index 16d52046..4f48102d 100644
--- a/src/backend/model/database/sql/GalleryManager.ts
+++ b/src/backend/model/database/sql/GalleryManager.ts
@@ -72,7 +72,7 @@ export class GalleryManager implements IGalleryManager, ISQLGalleryManager {
 
       // not indexed since a while, index it in a lazy manner
       if ((Date.now() - dir.lastScanned > Config.Server.Indexing.cachedFolderTimeout &&
-        Config.Server.Indexing.reIndexingSensitivity >= ReIndexingSensitivity.medium) ||
+          Config.Server.Indexing.reIndexingSensitivity >= ReIndexingSensitivity.medium) ||
         Config.Server.Indexing.reIndexingSensitivity >= ReIndexingSensitivity.high) {
         // on the fly reindexing
 
@@ -224,7 +224,7 @@ export class GalleryManager implements IGalleryManager, ISQLGalleryManager {
     dir.media = [];
     dir.preview = await ObjectManagers.getInstance().PreviewManager.getPreviewForDirectory(dir);
     dir.isPartial = true;
-    
+
     if (dir.preview) {
       dir.preview.readyThumbnails = [];
       dir.preview.readyIcon = false;
diff --git a/src/backend/model/database/sql/IndexingManager.ts b/src/backend/model/database/sql/IndexingManager.ts
index 6e055426..0b91b10d 100644
--- a/src/backend/model/database/sql/IndexingManager.ts
+++ b/src/backend/model/database/sql/IndexingManager.ts
@@ -95,6 +95,23 @@ export class IndexingManager implements IIndexingManager {
       .execute();
   }
 
+  public async saveToDB(scannedDirectory: ParentDirectoryDTO): Promise<void> {
+    this.isSaving = true;
+    try {
+      const connection = await SQLConnection.getConnection();
+      const serverSideConfigs = scannedDirectory.metaFile.filter(m => !!ServerPG2ConfMap[m.name]);
+      scannedDirectory.metaFile = scannedDirectory.metaFile.filter(m => !ServerPG2ConfMap[m.name]);
+      const currentDirId: number = await this.saveParentDir(connection, scannedDirectory);
+      await this.saveChildDirs(connection, currentDirId, scannedDirectory);
+      await this.saveMedia(connection, currentDirId, scannedDirectory.media);
+      await this.saveMetaFiles(connection, currentDirId, scannedDirectory);
+      await IndexingManager.processServerSidePG2Conf(serverSideConfigs);
+      await ObjectManagers.getInstance().onDataChange(scannedDirectory);
+    } finally {
+      this.isSaving = false;
+    }
+  }
+
   // Todo fix it, once typeorm support connection pools for sqlite
   /**
    * Queues up a directory to save to the DB.
@@ -359,25 +376,6 @@ export class IndexingManager implements IIndexingManager {
 
   }
 
-  protected async saveToDB(scannedDirectory: ParentDirectoryDTO): Promise<void> {
-    this.isSaving = true;
-    try {
-      const connection = await SQLConnection.getConnection();
-      const serverSideConfigs = scannedDirectory.metaFile.filter(m => !!ServerPG2ConfMap[m.name]);
-      scannedDirectory.metaFile = scannedDirectory.metaFile.filter(m => !ServerPG2ConfMap[m.name]);
-      const currentDirId: number = await this.saveParentDir(connection, scannedDirectory);
-      await this.saveChildDirs(connection, currentDirId, scannedDirectory);
-      await this.saveMedia(connection, currentDirId, scannedDirectory.media);
-      await this.saveMetaFiles(connection, currentDirId, scannedDirectory);
-      await ObjectManagers.getInstance().PersonManager.onGalleryIndexUpdate();
-      await ObjectManagers.getInstance().AlbumManager.onGalleryIndexUpdate();
-      await ObjectManagers.getInstance().VersionManager.updateDataVersion();
-      await IndexingManager.processServerSidePG2Conf(serverSideConfigs);
-    } finally {
-      this.isSaving = false;
-    }
-  }
-
   private async saveChunk<T>(repository: Repository<any>, entities: T[], size: number): Promise<T[]> {
     if (entities.length === 0) {
       return [];
diff --git a/src/backend/model/database/sql/PersonManager.ts b/src/backend/model/database/sql/PersonManager.ts
index 90a22845..b81bc2d2 100644
--- a/src/backend/model/database/sql/PersonManager.ts
+++ b/src/backend/model/database/sql/PersonManager.ts
@@ -77,7 +77,7 @@ export class PersonManager implements ISQLPersonManager {
 
   }
 
-  public async onGalleryIndexUpdate(): Promise<void> {
+  public async onNewDataVersion(): Promise<void> {
     await this.updateCounts();
     await this.updateSamplePhotos();
     await this.loadAll();
diff --git a/src/backend/model/database/sql/VersionManager.ts b/src/backend/model/database/sql/VersionManager.ts
index b6f8c0fe..5495c2b5 100644
--- a/src/backend/model/database/sql/VersionManager.ts
+++ b/src/backend/model/database/sql/VersionManager.ts
@@ -16,7 +16,7 @@ export class VersionManager implements IVersionManager {
 
   async getDataVersion(): Promise<string> {
     if (this.latestDirectoryStatus === null) {
-      await this.updateDataVersion();
+      await this.onNewDataVersion();
     }
 
     if (!this.latestDirectoryStatus) {
@@ -31,7 +31,7 @@ export class VersionManager implements IVersionManager {
     return crypto.createHash('md5').update(versionString).digest('hex');
   }
 
-  async updateDataVersion(): Promise<void> {
+  async onNewDataVersion(): Promise<void> {
     const connection = await SQLConnection.getConnection();
     const dir = await connection.getRepository(DirectoryEntity)
       .createQueryBuilder('directory')
diff --git a/test/backend/DBTestHelper.ts b/test/backend/DBTestHelper.ts
index 5fc08ce5..cd6b0b96 100644
--- a/test/backend/DBTestHelper.ts
+++ b/test/backend/DBTestHelper.ts
@@ -5,7 +5,6 @@ import {SQLConnection} from '../../src/backend/model/database/sql/SQLConnection'
 import {DatabaseType} from '../../src/common/config/private/PrivateConfig';
 import {ProjectPath} from '../../src/backend/ProjectPath';
 import {DirectoryBaseDTO, ParentDirectoryDTO} from '../../src/common/entities/DirectoryDTO';
-import {DirectoryEntity} from '../../src/backend/model/database/sql/enitites/DirectoryEntity';
 import {ObjectManagers} from '../../src/backend/model/ObjectManagers';
 import {DiskMangerWorker} from '../../src/backend/model/threading/DiskMangerWorker';
 import {IndexingManager} from '../../src/backend/model/database/sql/IndexingManager';
@@ -89,8 +88,7 @@ export class DBTestHelper {
     ObjectManagers.getInstance().IndexingManager.indexDirectory = () => Promise.resolve(null);
 
 
-    const im = new IndexingManagerTest();
-    await im.saveToDB(directory as ParentDirectoryDTO);
+    await ObjectManagers.getInstance().IndexingManager.saveToDB(directory as ParentDirectoryDTO);
     // not saving subdirs. saveToDB destroys data
     // await im.saveToDB(subDir);
     // await im.saveToDB(subDir2);