diff --git a/docs/changelog.rst b/docs/changelog.rst
index 89721cb..6e19cff 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,8 @@
 Changelog
 =========
 
+* :bug:`-` remove stale disk usage stats older than 30 minutes
+
 * :release:`0.15.0 <2023-07-23>
 * :feature:`10` add disk usage details for mail and web
 
diff --git a/gnuviechadmin/hostingpackages/views.py b/gnuviechadmin/hostingpackages/views.py
index ea5b4ac..37cd749 100644
--- a/gnuviechadmin/hostingpackages/views.py
+++ b/gnuviechadmin/hostingpackages/views.py
@@ -6,6 +6,7 @@ from __future__ import absolute_import
 
 import http
 import logging
+from datetime import timedelta
 
 from django.conf import settings
 from django.contrib import messages
@@ -13,6 +14,7 @@ from django.contrib.auth import get_user_model
 from django.contrib.auth.mixins import PermissionRequiredMixin, UserPassesTestMixin
 from django.http import Http404
 from django.shortcuts import get_object_or_404, redirect
+from django.utils import timezone
 from django.utils.translation import gettext as _
 from django.views.generic import DetailView, ListView
 from django.views.generic.edit import CreateView, FormView
@@ -278,8 +280,8 @@ class AddHostingOption(StaffUserRequiredMixin, FormView):
 class HasDiskUsageUploadPermission(BasePermission):
     def has_permission(self, request, view):
         return (
-            request.user.has_perm("hostingpackages.add_customerpackagediskusage")
-            and request.method == "POST"
+                request.user.has_perm("hostingpackages.add_customerpackagediskusage")
+                and request.method == "POST"
         )
 
 
@@ -292,12 +294,15 @@ class UploadCustomerPackageDiskUsage(APIView):
         if request.content_type != "application/json":
             return Response("Unacceptable", status=http.HTTPStatus.BAD_REQUEST)
 
+        submitted_sources = set()
+
         for row in request.data:
             user = row["user"]
             for key in row:
                 if key == "user":
                     continue
                 else:
+                    submitted_sources.add(key)
                     for item, size in row[key].items():
                         try:
                             package = CustomerHostingPackage.objects.get(
@@ -315,7 +320,9 @@ class UploadCustomerPackageDiskUsage(APIView):
 
                             if key == "mail":
                                 try:
-                                    ma_mb = package.mailboxes.get(username=item).mailaddressmailbox_set.first()
+                                    ma_mb = package.mailboxes.get(
+                                        username=item
+                                    ).mailaddressmailbox_set.first()
                                     if ma_mb:
                                         metric.email_address_id = ma_mb.mailaddress_id
                                 except Mailbox.DoesNotExist:
@@ -327,6 +334,12 @@ class UploadCustomerPackageDiskUsage(APIView):
                                 "hosting package for user %s does not exist", user
                             )
 
+        if submitted_sources:
+            CustomerPackageDiskUsage.objects.filter(
+                source__in=submitted_sources,
+                modified__lt=timezone.now() - timedelta(minutes=30),
+            ).delete()
+
         logger.info("usage data submitted by %s", request.user)
 
         return Response("Accepted", status=http.HTTPStatus.ACCEPTED)
@@ -356,7 +369,7 @@ class CustomerHostingPackageDiskUsageDetails(StaffOrSelfLoginRequiredMixin, Deta
         mail_usage, web_usage, mysql_usage, pgsql_usage = [], [], [], []
 
         for usage in self.get_object().customerpackagediskusage_set.order_by(
-            "-used_kb"
+                "-used_kb"
         ):
             if usage.used_kb <= 0:
                 continue