resolve issues with new features

backend/src/services/notification.service.ts

@@ -113,6 +113,33 @@ class NotificationService {
     }
   }
 
+  /** Marks all unread notifications of a given quell_typ as read for a user. */
+  async dismissByType(userId: string, quellTyp: string): Promise<void> {
+    try {
+      await pool.query(
+        `UPDATE notifications SET gelesen = TRUE, gelesen_am = NOW()
+         WHERE user_id = $1 AND quell_typ = $2 AND gelesen = FALSE`,
+        [userId, quellTyp]
+      );
+    } catch (error) {
+      logger.error('NotificationService.dismissByType failed', { error, userId, quellTyp });
+      throw new Error('Notifications konnten nicht als gelesen markiert werden');
+    }
+  }
+
+  /** Deletes all read notifications for a user. */
+  async deleteAllRead(userId: string): Promise<void> {
+    try {
+      await pool.query(
+        `DELETE FROM notifications WHERE user_id = $1 AND gelesen = TRUE`,
+        [userId]
+      );
+    } catch (error) {
+      logger.error('NotificationService.deleteAllRead failed', { error, userId });
+      throw new Error('Gelesene Notifications konnten nicht gelöscht werden');
+    }
+  }
+
   /** Deletes read notifications older than 90 days for all users. */
   async deleteOldRead(): Promise<void> {
     try {