diff --git a/frontend/src/api/.openapi-generator/FILES b/frontend/src/api/.openapi-generator/FILES
index aee98ad..fe29b43 100644
--- a/frontend/src/api/.openapi-generator/FILES
+++ b/frontend/src/api/.openapi-generator/FILES
@@ -47,6 +47,7 @@ model/taskOverviewInfo.ts
 model/taskScheduleStopResponse.ts
 model/taskShortInfo.ts
 model/taskTaskgroupInfo.ts
+model/taskgroupActivityInfo.ts
 model/taskgroupDetailInfo.ts
 model/taskgroupEntityInfo.ts
 model/taskgroupFieldInfo.ts
diff --git a/frontend/src/api/api/history.service.ts b/frontend/src/api/api/history.service.ts
index 46e7755..bc7e6bc 100644
--- a/frontend/src/api/api/history.service.ts
+++ b/frontend/src/api/api/history.service.ts
@@ -20,6 +20,7 @@ import { Observable }                                        from 'rxjs';
 
 import { ScheduleStatus } from '../model/models';
 import { SimpleStatusResponse } from '../model/models';
+import { TaskgroupActivityInfo } from '../model/models';
 
 import { BASE_PATH, COLLECTION_FORMATS }                     from '../variables';
 import { Configuration }                                     from '../configuration';
@@ -141,4 +142,73 @@ export class HistoryService {
         );
     }
 
+    /**
+     * @param taskgroupID internal id of taskgroup
+     * @param startingDate starting date
+     * @param endingDate starting date
+     * @param includeSubTaskgroups determines whether to include subtaskgroups or not
+     * @param observe set whether or not to return the data Observable as the body, response or events. defaults to returning the body.
+     * @param reportProgress flag to report request and response progress.
+     */
+    public statisticsTaskgroupActivityTaskgroupIDStartingDateEndingDateIncludeSubTaskgroupsGet(taskgroupID: number, startingDate: string, endingDate: string, includeSubTaskgroups: boolean, observe?: 'body', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<Array<TaskgroupActivityInfo>>;
+    public statisticsTaskgroupActivityTaskgroupIDStartingDateEndingDateIncludeSubTaskgroupsGet(taskgroupID: number, startingDate: string, endingDate: string, includeSubTaskgroups: boolean, observe?: 'response', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<HttpResponse<Array<TaskgroupActivityInfo>>>;
+    public statisticsTaskgroupActivityTaskgroupIDStartingDateEndingDateIncludeSubTaskgroupsGet(taskgroupID: number, startingDate: string, endingDate: string, includeSubTaskgroups: boolean, observe?: 'events', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<HttpEvent<Array<TaskgroupActivityInfo>>>;
+    public statisticsTaskgroupActivityTaskgroupIDStartingDateEndingDateIncludeSubTaskgroupsGet(taskgroupID: number, startingDate: string, endingDate: string, includeSubTaskgroups: boolean, observe: any = 'body', reportProgress: boolean = false, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<any> {
+        if (taskgroupID === null || taskgroupID === undefined) {
+            throw new Error('Required parameter taskgroupID was null or undefined when calling statisticsTaskgroupActivityTaskgroupIDStartingDateEndingDateIncludeSubTaskgroupsGet.');
+        }
+        if (startingDate === null || startingDate === undefined) {
+            throw new Error('Required parameter startingDate was null or undefined when calling statisticsTaskgroupActivityTaskgroupIDStartingDateEndingDateIncludeSubTaskgroupsGet.');
+        }
+        if (endingDate === null || endingDate === undefined) {
+            throw new Error('Required parameter endingDate was null or undefined when calling statisticsTaskgroupActivityTaskgroupIDStartingDateEndingDateIncludeSubTaskgroupsGet.');
+        }
+        if (includeSubTaskgroups === null || includeSubTaskgroups === undefined) {
+            throw new Error('Required parameter includeSubTaskgroups was null or undefined when calling statisticsTaskgroupActivityTaskgroupIDStartingDateEndingDateIncludeSubTaskgroupsGet.');
+        }
+
+        let localVarHeaders = this.defaultHeaders;
+
+        let localVarCredential: string | undefined;
+        // authentication (API_TOKEN) required
+        localVarCredential = this.configuration.lookupCredential('API_TOKEN');
+        if (localVarCredential) {
+            localVarHeaders = localVarHeaders.set('Authorization', 'Bearer ' + localVarCredential);
+        }
+
+        let localVarHttpHeaderAcceptSelected: string | undefined = options && options.httpHeaderAccept;
+        if (localVarHttpHeaderAcceptSelected === undefined) {
+            // to determine the Accept header
+            const httpHeaderAccepts: string[] = [
+                'application/json'
+            ];
+            localVarHttpHeaderAcceptSelected = this.configuration.selectHeaderAccept(httpHeaderAccepts);
+        }
+        if (localVarHttpHeaderAcceptSelected !== undefined) {
+            localVarHeaders = localVarHeaders.set('Accept', localVarHttpHeaderAcceptSelected);
+        }
+
+        let localVarHttpContext: HttpContext | undefined = options && options.context;
+        if (localVarHttpContext === undefined) {
+            localVarHttpContext = new HttpContext();
+        }
+
+
+        let responseType_: 'text' | 'json' = 'json';
+        if(localVarHttpHeaderAcceptSelected && localVarHttpHeaderAcceptSelected.startsWith('text')) {
+            responseType_ = 'text';
+        }
+
+        return this.httpClient.get<Array<TaskgroupActivityInfo>>(`${this.configuration.basePath}/statistics/taskgroup-activity/${encodeURIComponent(String(taskgroupID))}/${encodeURIComponent(String(startingDate))}/${encodeURIComponent(String(endingDate))}/${encodeURIComponent(String(includeSubTaskgroups))}`,
+            {
+                context: localVarHttpContext,
+                responseType: <any>responseType_,
+                withCredentials: this.configuration.withCredentials,
+                headers: localVarHeaders,
+                observe: observe,
+                reportProgress: reportProgress
+            }
+        );
+    }
+
 }
diff --git a/frontend/src/api/model/models.ts b/frontend/src/api/model/models.ts
index 78779ac..1411e50 100644
--- a/frontend/src/api/model/models.ts
+++ b/frontend/src/api/model/models.ts
@@ -30,6 +30,7 @@ export * from './taskOverviewInfo';
 export * from './taskScheduleStopResponse';
 export * from './taskShortInfo';
 export * from './taskTaskgroupInfo';
+export * from './taskgroupActivityInfo';
 export * from './taskgroupDetailInfo';
 export * from './taskgroupEntityInfo';
 export * from './taskgroupFieldInfo';
diff --git a/frontend/src/api/model/taskgroupActivityInfo.ts b/frontend/src/api/model/taskgroupActivityInfo.ts
new file mode 100644
index 0000000..fc6a973
--- /dev/null
+++ b/frontend/src/api/model/taskgroupActivityInfo.ts
@@ -0,0 +1,21 @@
+/**
+ * API Title
+ * No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
+ *
+ * The version of the OpenAPI document: 1.0
+ * 
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+
+export interface TaskgroupActivityInfo { 
+    date: string;
+    /**
+     * Number of minutes the task was active
+     */
+    activeMinutes: number;
+}
+