diff --git a/backend/apps/library/guest_filter.py b/backend/apps/library/guest_filter.py
index 633d500..15c3450 100644
--- a/backend/apps/library/guest_filter.py
+++ b/backend/apps/library/guest_filter.py
@@ -20,6 +20,7 @@ from django.core.cache import cache
 logger = logging.getLogger(__name__)
 
 CACHE_KEY = "j621.guest_blacklist"
+MIRROR_KEY = "j621.guest_blacklist.mirror"
 
 
 def parse_blacklist_patterns(lines):
@@ -37,10 +38,18 @@ def parse_blacklist_patterns(lines):
 
 
 def cached_guest_blacklist():
-    """Raw mirrored blacklist lines. Never hits the network."""
+    """Raw mirrored blacklist lines. Never hits the network.
+
+    Prefers the TTL'd entry, falls back to the persistent mirror (last
+    successful e621 fetch) and only then to the local fallback list, so an
+    expired TTL never degrades filtering.
+    """
     stored = cache.get(CACHE_KEY)
     if stored is not None:
         return list(stored)
+    mirror = cache.get(MIRROR_KEY)
+    if mirror is not None:
+        return list(mirror)
     return list(settings.GUEST_BLACKLIST_FALLBACK)
 
 
@@ -101,7 +110,11 @@ def refresh_guest_blacklist():
     lines = fetch_e621_default_blacklist()
     used_fallback = lines is None
     if used_fallback:
-        lines = list(settings.GUEST_BLACKLIST_FALLBACK)
+        # Keep the last successful mirror (or the local list) rather than
+        # degrading guest filtering when e621 is unreachable.
+        lines = cache.get(MIRROR_KEY) or list(settings.GUEST_BLACKLIST_FALLBACK)
+    else:
+        cache.set(MIRROR_KEY, lines, timeout=None)
     cache.set(CACHE_KEY, lines, settings.GUEST_BLACKLIST_TTL)
 
     patterns = parse_blacklist_patterns(lines)
diff --git a/backend/apps/library/serializers.py b/backend/apps/library/serializers.py
index e966e91..d80afd2 100644
--- a/backend/apps/library/serializers.py
+++ b/backend/apps/library/serializers.py
@@ -1,10 +1,11 @@
 import os
+from pathlib import Path
 
 from django.core import signing
 from rest_framework import serializers
 
 from .models import MediaItem, MediaLocation, TempUpload
-from .services import UPLOAD_FILE_SALT, VIDEO_EXTENSIONS
+from .services import MEDIA_FILE_SALT, UPLOAD_FILE_SALT, VIDEO_EXTENSIONS
 
 
 class MediaLocationSerializer(serializers.ModelSerializer):
@@ -99,6 +100,7 @@ class TempUploadSerializer(serializers.ModelSerializer):
     temp_id = serializers.UUIDField(source="id", read_only=True)
     library_j_id = serializers.SerializerMethodField()
     file_url = serializers.SerializerMethodField()
+    preview_url = serializers.SerializerMethodField()
 
     class Meta:
         model = TempUpload
@@ -117,11 +119,19 @@ class TempUploadSerializer(serializers.ModelSerializer):
             "iqdb_data",
             "library_j_id",
             "file_url",
+            "preview_url",
             "created_at",
             "updated_at",
         ]
         read_only_fields = fields
 
+    def _request_user(self):
+        request = self.context.get("request")
+        user = getattr(request, "user", None)
+        if user is None or not getattr(user, "is_authenticated", False):
+            return None
+        return user
+
     def get_library_j_id(self, obj):
         return f"J-{obj.library_item_id}" if obj.library_item_id else None
 
@@ -129,12 +139,33 @@ class TempUploadSerializer(serializers.ModelSerializer):
         """Signed URL so <img>/<video> tags can fetch the staged file."""
         if not obj.file:
             return None
-        request = self.context.get("request")
-        user = getattr(request, "user", None)
-        if user is None or not getattr(user, "is_authenticated", False):
+        user = self._request_user()
+        if user is None:
             return None
         signature = signing.dumps(
             {"temp": str(obj.id), "user": user.id},
             salt=UPLOAD_FILE_SALT,
         )
         return f"/api/uploads/{obj.id}/file/?sig={signature}"
+
+    def get_preview_url(self, obj):
+        """A URL an <img>/<video> tag can load: staged file or library item."""
+        user = self._request_user()
+        if user is None:
+            return None
+        if obj.file:
+            return self.get_file_url(obj)
+        item = obj.library_item
+        if item is None:
+            return None
+        location = item.locations.first()
+        is_video = (
+            location is not None
+            and Path(location.rel_path).suffix.lower() in VIDEO_EXTENSIONS
+        )
+        action = "thumbnail" if is_video else "raw"
+        signature = signing.dumps(
+            {"item": item.id, "user": user.id, "action": action},
+            salt=MEDIA_FILE_SALT,
+        )
+        return f"/api/files/J-{item.id}/{action}/?sig={signature}"
diff --git a/backend/apps/library/services.py b/backend/apps/library/services.py
index 485ed0a..f92955d 100644
--- a/backend/apps/library/services.py
+++ b/backend/apps/library/services.py
@@ -25,6 +25,7 @@ ALLOWED_EXTENSIONS = {
 }
 VIDEO_EXTENSIONS = {".mp4", ".webm"}
 UPLOAD_FILE_SALT = "j621.upload-file"
+MEDIA_FILE_SALT = "j621.media-file"
 CHUNK_SIZE = 1024 * 1024
 RANGE_RE = re.compile(r"bytes=(\d*)-(\d*)$")
 
diff --git a/backend/apps/library/views.py b/backend/apps/library/views.py
index e07e790..09a2d2d 100644
--- a/backend/apps/library/views.py
+++ b/backend/apps/library/views.py
@@ -3,6 +3,7 @@ from pathlib import Path
 from urllib.parse import urlparse
 
 from django.conf import settings
+from django.core import signing
 from django.db.models import Min
 from django.http import Http404
 from django.shortcuts import get_object_or_404
@@ -67,9 +68,32 @@ class MediaItemViewSet(
         self.check_object_permissions(self.request, obj)
         return obj
 
+    def _signed_media_item(self, request, action_name):
+        """Signed media URLs let <img>/<video> tags bypass guest filtering."""
+        if request.user.is_authenticated:
+            return None
+        signature = request.query_params.get("sig")
+        if not signature:
+            return None
+        try:
+            payload = signing.loads(
+                signature, salt=services.MEDIA_FILE_SALT, max_age=86400
+            )
+        except signing.BadSignature:
+            return None
+        if payload.get("action") != action_name:
+            return None
+        return MediaItem.objects.filter(pk=payload.get("item")).first()
+
+    def _media_object(self, request, action_name):
+        item = self._signed_media_item(request, action_name)
+        if item is not None:
+            return item
+        return self.get_object()
+
     @action(detail=True, methods=["get"])
     def raw(self, request, pk=None):
-        item = self.get_object()
+        item = self._media_object(request, "raw")
         location = item.locations.first()
         if location is None:
             return Response(
@@ -82,7 +106,7 @@ class MediaItemViewSet(
 
     @action(detail=True, methods=["get"])
     def thumbnail(self, request, pk=None):
-        item = self.get_object()
+        item = self._media_object(request, "thumbnail")
         location = item.locations.first()
         if location is None:
             return Response(
diff --git a/frontend/src/features/upload/UploadPage.tsx b/frontend/src/features/upload/UploadPage.tsx
index 93711a7..3b9b71b 100644
--- a/frontend/src/features/upload/UploadPage.tsx
+++ b/frontend/src/features/upload/UploadPage.tsx
@@ -4,7 +4,7 @@ import {
   UploadCloud,
   X,
 } from "lucide-react";
-import { useRef, useState, type DragEvent } from "react";
+import { useRef, useState, type DragEvent, type ReactNode } from "react";
 import { Link } from "react-router-dom";
 
 import { Button, EmptyState, Spinner, inputClass } from "@/components/ui";
@@ -102,14 +102,15 @@ function TempCard({
   onDismiss: () => void;
 }) {
   const isVideo = /\.(mp4|webm)$/i.test(temp.original_filename);
+  const preview = temp.preview_url ?? temp.file_url;
 
   return (
     <div className="rounded-lg border border-ctp-surface0 bg-ctp-base p-2.5">
       <div className="relative aspect-video overflow-hidden rounded-md bg-ctp-mantle">
-        {temp.file_url ? (
+        {preview ? (
           isVideo ? (
             <video
-              src={temp.file_url}
+              src={preview}
               muted
               playsInline
               preload="metadata"
@@ -117,7 +118,7 @@ function TempCard({
             />
           ) : (
             <img
-              src={temp.file_url}
+              src={preview}
               alt={temp.original_filename}
               loading="lazy"
               className="h-full w-full object-cover"
@@ -125,7 +126,7 @@ function TempCard({
           )
         ) : (
           <div className="flex h-full w-full items-center justify-center text-xs text-ctp-overlay0">
-            {temp.status === "completed" ? "Indexed" : "No preview"}
+            No preview
           </div>
         )}
         {temp.status === "visual_match" && temp.iqdb_data?.length ? (
@@ -303,17 +304,17 @@ function MetadataModal({
 
         <div className="mt-4 grid gap-4 sm:grid-cols-[200px_minmax(0,1fr)]">
           <div className="overflow-hidden rounded-md border border-ctp-surface0 bg-ctp-mantle">
-            {temp.file_url ? (
+            {(temp.preview_url ?? temp.file_url) ? (
               isVideo ? (
                 <video
-                  src={temp.file_url}
+                  src={(temp.preview_url ?? temp.file_url) as string}
                   controls
                   muted
                   className="max-h-52 w-full object-contain"
                 />
               ) : (
                 <img
-                  src={temp.file_url}
+                  src={(temp.preview_url ?? temp.file_url) as string}
                   alt={temp.original_filename}
                   className="max-h-52 w-full object-contain"
                 />
@@ -715,6 +716,15 @@ export default function UploadPage() {
     );
   }
 
+  function dismissAll(items: TempUpload[]) {
+    if (items.length === 0) return;
+    void Promise.allSettled(
+      items.map((temp) =>
+        api(`/api/uploads/${temp.temp_id}/`, { method: "DELETE" }),
+      ),
+    ).then(() => invalidateUploads());
+  }
+
   function clearFinished() {
     setEntries((current) => current.filter((entry) => entry.status !== "done"));
   }
@@ -737,12 +747,16 @@ export default function UploadPage() {
     title: string,
     items: TempUpload[],
     emptyText: string,
+    action?: ReactNode,
   ) => (
     <section className="flex min-w-0 flex-col gap-3">
       <header className="flex items-center justify-between gap-2">
         <h2 className="text-sm font-semibold text-ctp-subtext1">{title}</h2>
-        <span className="font-mono text-[11px] text-ctp-overlay0">
-          {items.length}
+        <span className="flex items-center gap-2">
+          {action}
+          <span className="font-mono text-[11px] text-ctp-overlay0">
+            {items.length}
+          </span>
         </span>
       </header>
       {items.length === 0 ? (
@@ -888,7 +902,21 @@ export default function UploadPage() {
           visual,
           "No IQDB matches right now.",
         )}
-        {column("Auto-uploaded & Indexed", completed, "Nothing indexed yet.")}
+        {column(
+          "Auto-uploaded & Indexed",
+          completed,
+          "Nothing indexed yet.",
+          completed.length > 0 ? (
+            <button
+              type="button"
+              onClick={() => dismissAll(completed)}
+              title="Dismiss every indexed record"
+              className="rounded-md px-1.5 py-0.5 font-mono text-[10px] text-ctp-overlay0 transition hover:bg-ctp-surface0 hover:text-ctp-text"
+            >
+              dismiss all
+            </button>
+          ) : null,
+        )}
       </div>
 
       {modalFor ? (
diff --git a/frontend/src/lib/types.ts b/frontend/src/lib/types.ts
index 30813ec..e4bec13 100644
--- a/frontend/src/lib/types.ts
+++ b/frontend/src/lib/types.ts
@@ -135,6 +135,7 @@ export interface TempUpload {
   iqdb_data: E621IqdbCandidate[] | null;
   library_j_id: string | null;
   file_url: string | null;
+  preview_url: string | null;
   created_at: string;
   updated_at: string;
 }