diff --git a/apps/bookmark/apps.py b/apps/bookmark/apps.py
index 419b8fc..7236513 100644
--- a/apps/bookmark/apps.py
+++ b/apps/bookmark/apps.py
@@ -4,3 +4,7 @@ from django.apps import AppConfig
 class BookmarkConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
     name = 'apps.bookmark'
+
+    def ready(self):
+        import apps.bookmark.signals  # noqa: F401
+
diff --git a/apps/bookmark/management/commands/cleanup_orphan_bookmarks.py b/apps/bookmark/management/commands/cleanup_orphan_bookmarks.py
new file mode 100644
index 0000000..cb80f97
--- /dev/null
+++ b/apps/bookmark/management/commands/cleanup_orphan_bookmarks.py
@@ -0,0 +1,84 @@
+import logging
+from django.core.management.base import BaseCommand
+from apps.bookmark.models import Bookmark
+
+logger = logging.getLogger(__name__)
+
+
+class Command(BaseCommand):
+    help = "Find and delete orphan bookmarks whose target content was deleted from the database."
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            '--dry-run',
+            action='store_true',
+            help='Scan and report orphan bookmarks without actually deleting them.',
+        )
+
+    def handle(self, *args, **options):
+        dry_run = options.get('dry_run', False)
+
+        from apps.library.models import Book
+        from apps.podcast.models import Podcast, PodcastPlaylist
+        from apps.video.models import Video, VideoPlaylist
+        from apps.hadis.models import Hadis, HadisCorrection
+        from apps.article.models import Article
+
+        service_model_map = {
+            Bookmark.ServiceChoices.LIBRARY: (Book, 'Library Book'),
+            Bookmark.ServiceChoices.PODCAST: (Podcast, 'Podcast'),
+            Bookmark.ServiceChoices.PODCAST_PLAYLIST: (PodcastPlaylist, 'Podcast Playlist'),
+            Bookmark.ServiceChoices.HADITH: (Hadis, 'Hadith'),
+            Bookmark.ServiceChoices.HADITH_CORRECTION: (HadisCorrection, 'Hadith Correction'),
+            Bookmark.ServiceChoices.VIDEO: (Video, 'Video'),
+            Bookmark.ServiceChoices.VIDEO_PLAYLIST: (VideoPlaylist, 'Video Playlist'),
+            Bookmark.ServiceChoices.ARTICLE: (Article, 'Article'),
+        }
+
+        total_checked = Bookmark.objects.count()
+        self.stdout.write(f"Scanning {total_checked} total bookmark(s)...")
+
+        total_orphans = 0
+        orphan_ids_to_delete = []
+
+        for service_choice, (model_cls, label) in service_model_map.items():
+            bms = Bookmark.objects.filter(service=service_choice)
+            content_ids = set(bms.values_list('content_id', flat=True))
+            if not content_ids:
+                continue
+
+            existing_ids = set(model_cls.objects.filter(id__in=content_ids).values_list('id', flat=True))
+            missing_ids = content_ids - existing_ids
+
+            if missing_ids:
+                orphan_bms = bms.filter(content_id__in=missing_ids)
+                count = orphan_bms.count()
+                total_orphans += count
+                ids = list(orphan_bms.values_list('id', flat=True))
+                orphan_ids_to_delete.extend(ids)
+                self.stdout.write(
+                    self.style.WARNING(f"  - [{label} ({service_choice})]: found {count} orphan bookmark(s) (missing IDs: {sorted(list(missing_ids))[:10]}{'...' if len(missing_ids) > 10 else ''})")
+                )
+
+        # Check any bookmarks with unknown service choices
+        known_services = set(service_model_map.keys())
+        unknown_bms = Bookmark.objects.exclude(service__in=known_services)
+        unknown_count = unknown_bms.count()
+        if unknown_count > 0:
+            total_orphans += unknown_count
+            orphan_ids_to_delete.extend(list(unknown_bms.values_list('id', flat=True)))
+            self.stdout.write(
+                self.style.WARNING(f"  - [Unknown Service]: found {unknown_count} bookmark(s) with invalid service name.")
+            )
+
+        if total_orphans == 0:
+            self.stdout.write(self.style.SUCCESS("No orphan bookmarks found! Everything is clean."))
+            return
+
+        self.stdout.write(f"\nTotal orphan bookmark(s) found: {total_orphans}")
+
+        if dry_run:
+            self.stdout.write(self.style.NOTICE("Dry run enabled. No bookmarks were deleted."))
+        else:
+            deleted_count, _ = Bookmark.objects.filter(id__in=orphan_ids_to_delete).delete()
+            self.stdout.write(self.style.SUCCESS(f"Successfully deleted {deleted_count} orphan bookmark(s)!"))
diff --git a/apps/bookmark/signals.py b/apps/bookmark/signals.py
new file mode 100644
index 0000000..be88d44
--- /dev/null
+++ b/apps/bookmark/signals.py
@@ -0,0 +1,81 @@
+import logging
+from django.db.models.signals import post_delete
+from django.dispatch import receiver
+
+from apps.bookmark.models import Bookmark
+
+logger = logging.getLogger(__name__)
+
+
+def _delete_bookmarks_for(service: str, content_id: int):
+    if not content_id:
+        return
+    try:
+        deleted_count, _ = Bookmark.objects.filter(service=service, content_id=content_id).delete()
+        if deleted_count > 0:
+            logger.info("[Bookmark] Auto-deleted %d bookmark(s) for %s ID %s upon content deletion.", deleted_count, service, content_id)
+    except Exception as exc:
+        logger.error("[Bookmark] Error deleting bookmarks for %s ID %s: %s", service, content_id, exc)
+
+
+# 1. Library Books
+try:
+    from apps.library.models import Book
+
+    @receiver(post_delete, sender=Book)
+    def on_book_deleted(sender, instance, **kwargs):
+        _delete_bookmarks_for(Bookmark.ServiceChoices.LIBRARY, instance.id)
+except ImportError:
+    pass
+
+# 2. Hadith & Hadith Corrections
+try:
+    from apps.hadis.models import Hadis, HadisCorrection
+
+    @receiver(post_delete, sender=Hadis)
+    def on_hadis_deleted(sender, instance, **kwargs):
+        _delete_bookmarks_for(Bookmark.ServiceChoices.HADITH, instance.id)
+
+    @receiver(post_delete, sender=HadisCorrection)
+    def on_hadis_correction_deleted(sender, instance, **kwargs):
+        _delete_bookmarks_for(Bookmark.ServiceChoices.HADITH_CORRECTION, instance.id)
+except ImportError:
+    pass
+
+# 3. Videos & Video Playlists
+try:
+    from apps.video.models import Video, VideoPlaylist
+
+    @receiver(post_delete, sender=Video)
+    def on_video_deleted(sender, instance, **kwargs):
+        _delete_bookmarks_for(Bookmark.ServiceChoices.VIDEO, instance.id)
+
+    @receiver(post_delete, sender=VideoPlaylist)
+    def on_video_playlist_deleted(sender, instance, **kwargs):
+        _delete_bookmarks_for(Bookmark.ServiceChoices.VIDEO_PLAYLIST, instance.id)
+except ImportError:
+    pass
+
+# 4. Podcasts & Podcast Playlists
+try:
+    from apps.podcast.models import Podcast, PodcastPlaylist
+
+    @receiver(post_delete, sender=Podcast)
+    def on_podcast_deleted(sender, instance, **kwargs):
+        _delete_bookmarks_for(Bookmark.ServiceChoices.PODCAST, instance.id)
+
+    @receiver(post_delete, sender=PodcastPlaylist)
+    def on_podcast_playlist_deleted(sender, instance, **kwargs):
+        _delete_bookmarks_for(Bookmark.ServiceChoices.PODCAST_PLAYLIST, instance.id)
+except ImportError:
+    pass
+
+# 5. Articles
+try:
+    from apps.article.models import Article
+
+    @receiver(post_delete, sender=Article)
+    def on_article_deleted(sender, instance, **kwargs):
+        _delete_bookmarks_for(Bookmark.ServiceChoices.ARTICLE, instance.id)
+except ImportError:
+    pass
diff --git a/apps/bookmark/views/bookmark.py b/apps/bookmark/views/bookmark.py
index 8b51c2b..9b30cbe 100644
--- a/apps/bookmark/views/bookmark.py
+++ b/apps/bookmark/views/bookmark.py
@@ -287,12 +287,16 @@ def _get_valid_content_ids(service, content_ids):
         elif service in ('article', 'blog'):
             from apps.article.models import Article
             return set(Article.objects.filter(id__in=content_ids, status=True).values_list('id', flat=True))
-        elif service in ('hadith', 'hadith_correction'):
-            from apps.hadith.models import Hadith
-            return set(Hadith.objects.filter(id__in=content_ids, status=True).values_list('id', flat=True))
-    except Exception:
-        pass
-    return set(content_ids)
+        elif service == 'hadith':
+            from apps.hadis.models import Hadis
+            return set(Hadis.objects.filter(id__in=content_ids, status=True).values_list('id', flat=True))
+        elif service == 'hadith_correction':
+            from apps.hadis.models import HadisCorrection
+            return set(HadisCorrection.objects.filter(id__in=content_ids).values_list('id', flat=True))
+    except Exception as exc:
+        import logging
+        logging.getLogger(__name__).warning("[Bookmark] Error validating content ids for service %s: %s", service, exc)
+    return set()
 
 
 class BookmarkStatusView(APIView):
@@ -386,8 +390,7 @@ class BookmarkListView(APIView):
                 if b.content_id in valid_ids:
                     valid_bookmarks.append(b)
                 else:
-                    b.status = False
-                    b.save(update_fields=['status'])
+                    b.delete()
 
         serializer = BookmarkSerializer(valid_bookmarks, many=True)
         return Response(serializer.data, status=status.HTTP_200_OK)