diff --git a/catalog/templates/_item_card.html b/catalog/templates/_item_card.html
index 3d35e244..74d9ae3b 100644
--- a/catalog/templates/_item_card.html
+++ b/catalog/templates/_item_card.html
@@ -1,4 +1,5 @@
 {% load i18n %}
+{% load duration %}
 {% if allow_embed and item.get_embed_link %}
   <div class="item player">
     <h5>
diff --git a/mastodon/management/commands/mastodon_sites.py b/mastodon/management/commands/mastodon_sites.py
new file mode 100644
index 00000000..55599d71
--- /dev/null
+++ b/mastodon/management/commands/mastodon_sites.py
@@ -0,0 +1,45 @@
+import pprint
+
+from django.core.management.base import BaseCommand
+
+from mastodon.api import create_app
+from mastodon.models import MastodonApplication
+
+
+class Command(BaseCommand):
+    help = "Manage Mastodon sites"
+
+    def add_arguments(self, parser):
+        #     parser.add_argument("domain", type=str, help="mastodon domain")
+        parser.add_argument(
+            "--refresh",
+            action="store_true",
+            help="refresh app registration on all sites",
+        )
+
+    def handle(self, *args, **options):
+        if options["refresh"]:
+            for site in MastodonApplication.objects.exclude(disabled=True):
+                allow_multiple_redir = True
+                response = create_app(site.api_domain, allow_multiple_redir)
+                if response.status_code != 200:
+                    self.stdout.write(
+                        f"Error creating app on {site.api_domain}: {response.status_code}"
+                    )
+                    continue
+                try:
+                    data = response.json()
+                except Exception:
+                    self.stdout.write(
+                        f"Error creating app on {site.api_domain}: unable to parse response"
+                    )
+                    continue
+                site.app_id = data["id"]
+                site.client_id = data["client_id"]
+                site.client_secret = data["client_secret"]
+                site.vapid_key = data.get("vapid_key")
+                site.save(
+                    update_fields=["app_id", "client_id", "client_secret", "vapid_key"]
+                )
+                self.stdout.write(f"updated app on {site.api_domain}")
+        self.stdout.write(self.style.SUCCESS("Done."))