avoid incorrect thumbnails

backend/app/routers/libraries.py

@@ -2,10 +2,11 @@ from pathlib import Path
 from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select
+from sqlalchemy.orm import selectinload
 
 from app.database import get_db
 from app.models import Library, MediaItem
-from app.schemas import LibraryCreate, LibraryOut, BrowseResult, BrowseEntry
+from app.schemas import LibraryCreate, LibraryOut, MediaItemOut, BrowseResult, BrowseEntry
 from app.services import scanner, watcher as watcher_service
 
 router = APIRouter(prefix="/libraries", tags=["libraries"])
@@ -63,6 +64,28 @@ async def rescan_library(
     return {"scanning": True}
 
 
+@router.get("/{library_id}/doom-scroll", response_model=list[MediaItemOut])
+async def doom_scroll(
+    library_id: int,
+    path: str = "",
+    db: AsyncSession = Depends(get_db),
+):
+    result = await db.execute(select(Library).where(Library.id == library_id))
+    if not result.scalars().first():
+        raise HTTPException(404, "Library not found")
+
+    stmt = (
+        select(MediaItem)
+        .options(selectinload(MediaItem.tags))
+        .where(MediaItem.library_id == library_id, MediaItem.missing == False)  # noqa: E712
+    )
+    if path:
+        stmt = stmt.where(MediaItem.rel_path.like(path + "/%"))
+
+    result = await db.execute(stmt)
+    return result.scalars().all()
+
+
 @router.delete("/{library_id}", status_code=204)
 async def delete_library(library_id: int, db: AsyncSession = Depends(get_db)):
     result = await db.execute(select(Library).where(Library.id == library_id))

backend/app/services/scanner.py

@@ -8,6 +8,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select
 from app.models import MediaItem
 from app.database import SessionLocal
+from app.services.thumbnails import thumbnail_path
 
 log = logging.getLogger(__name__)
 
@@ -86,6 +87,11 @@ async def _do_scan(library_id: int, library_path: str, db: AsyncSession) -> None
 
             if rel in db_items:
                 item = db_items[rel]
+                new_hash = await loop.run_in_executor(None, hash_file, file_path)
+                if item.file_hash != new_hash:
+                    item.file_hash = new_hash
+                    item.updated_at = datetime.utcnow()
+                    thumbnail_path(item.id).unlink(missing_ok=True)
                 if item.missing:
                     item.missing = False
                     item.updated_at = datetime.utcnow()
@@ -93,6 +99,7 @@ async def _do_scan(library_id: int, library_path: str, db: AsyncSession) -> None
                 file_hash = await loop.run_in_executor(None, hash_file, file_path)
                 moved = await _find_by_hash(library_id, file_hash, db)
                 if moved:
+                    thumbnail_path(moved.id).unlink(missing_ok=True)
                     moved.rel_path = rel
                     moved.filename = file_path.name
                     moved.missing = False
@@ -131,4 +138,5 @@ async def _find_by_hash(library_id: int, file_hash: str, db: AsyncSession) -> Me
             MediaItem.missing == True,  # noqa: E712
         )
     )
-    return result.scalars().first()
+    rows = result.scalars().all()
+    return rows[0] if len(rows) == 1 else None

backend/app/services/watcher.py

@@ -9,6 +9,7 @@ from sqlalchemy import select
 from app.database import SessionLocal
 from app.models import Library, MediaItem
 from app.services.scanner import classify, hash_file
+from app.services.thumbnails import thumbnail_path
 
 log = logging.getLogger(__name__)
 
@@ -59,6 +60,7 @@ class LibraryEventHandler(FileSystemEventHandler):
                 )
                 item = result.scalars().first()
                 if item:
+                    thumbnail_path(item.id).unlink(missing_ok=True)
                     item.rel_path = dest_rel
                     item.filename = Path(event.dest_path).name
                     item.missing = False

frontend/src/api/client.ts

@@ -71,6 +71,8 @@ export const api = {
       request<{ scanning: boolean }>(`/libraries/${id}/scan-status`),
     rescan: (id: number) =>
       request<{ scanning: boolean }>(`/libraries/${id}/rescan`, { method: "POST" }),
+    doomScroll: (id: number, path = "") =>
+      request<MediaItem[]>(`/libraries/${id}/doom-scroll?path=${encodeURIComponent(path)}`),
   },
 
   media: {

frontend/src/components/DoomScrollViewer/DoomScrollViewer.tsx

@@ -0,0 +1,107 @@
+import { useEffect, useRef, useState } from "react";
+import { api, type MediaItem } from "../../api/client";
+
+interface Props {
+  items: MediaItem[];
+  onClose: () => void;
+  onViewInLibrary: (item: MediaItem) => void;
+}
+
+export default function DoomScrollViewer({ items, onClose, onViewInLibrary }: Props) {
+  const [index, setIndex] = useState(0);
+  const [fading, setFading] = useState(false);
+  const wheelLock = useRef(false);
+
+  const item = items[index];
+
+  function go(delta: 1 | -1) {
+    if (wheelLock.current) return;
+    const next = index + delta;
+    if (next < 0 || next >= items.length) return;
+    wheelLock.current = true;
+    setFading(true);
+    setTimeout(() => {
+      setIndex(next);
+      setFading(false);
+      wheelLock.current = false;
+    }, 200);
+  }
+
+  useEffect(() => {
+    const onWheel = (e: WheelEvent) => { e.deltaY > 0 ? go(1) : go(-1); };
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === "ArrowDown" || e.key === " ") { e.preventDefault(); go(1); }
+      if (e.key === "ArrowUp") { e.preventDefault(); go(-1); }
+      if (e.key === "Escape") onClose();
+    };
+    window.addEventListener("wheel", onWheel, { passive: true });
+    window.addEventListener("keydown", onKey);
+    return () => {
+      window.removeEventListener("wheel", onWheel);
+      window.removeEventListener("keydown", onKey);
+    };
+  }, [index, fading]);
+
+  return (
+    <>
+      {/* Backdrop */}
+      <div style={{ position: "fixed", inset: 0, background: "rgba(0,0,0,0.95)", zIndex: 200 }} />
+
+      {/* Media area */}
+      <div
+        style={{
+          position: "fixed", inset: 0, zIndex: 201,
+          display: "flex", flexDirection: "column", alignItems: "center", justifyContent: "center",
+          gap: 12, paddingBottom: 56,
+          transition: "opacity 0.2s ease, transform 0.2s ease",
+          opacity: fading ? 0 : 1,
+          transform: fading ? "translateY(-12px)" : "translateY(0)",
+        }}
+      >
+        <div style={{ color: "#ccc", fontSize: 13 }}>{item?.filename}</div>
+        {item?.media_type === "image" && (
+          <img
+            key={item.id}
+            src={api.media.fileUrl(item.id)}
+            alt={item.filename}
+            style={{ maxWidth: "90vw", maxHeight: "82vh", objectFit: "contain" }}
+          />
+        )}
+        {item?.media_type === "video" && (
+          <video
+            key={item.id}
+            src={api.media.fileUrl(item.id)}
+            controls
+            autoPlay
+            style={{ maxWidth: "90vw", maxHeight: "82vh" }}
+          />
+        )}
+      </div>
+
+      {/* Bottom bar */}
+      <div
+        style={{
+          position: "fixed", bottom: 0, left: 0, right: 0, zIndex: 202,
+          display: "flex", alignItems: "center", justifyContent: "space-between",
+          padding: "12px 20px", background: "rgba(0,0,0,0.6)",
+        }}
+      >
+        <button
+          onClick={onClose}
+          style={{ background: "none", border: "none", color: "#fff", fontSize: 15, cursor: "pointer" }}
+        >
+          ✕ Close
+        </button>
+        <span style={{ color: "#888", fontSize: 13 }}>
+          {index + 1} / {items.length}
+        </span>
+        <button
+          onClick={() => onViewInLibrary(item)}
+          style={{ background: "none", border: "none", color: "var(--accent, #60a5fa)", fontSize: 15, cursor: "pointer" }}
+        >
+          View in Library →
+        </button>
+      </div>
+    </>
+  );
+}

frontend/src/components/FileBrowser/FileBrowser.tsx

@@ -1,15 +1,21 @@
 import { useState } from "react";
+import { useSearchParams } from "react-router-dom";
 import { useQuery } from "@tanstack/react-query";
-import { api, type BrowseResult } from "../../api/client";
+import { api, type BrowseResult, type MediaItem } from "../../api/client";
 import MediaViewer from "../MediaViewer/MediaViewer";
+import DoomScrollViewer from "../DoomScrollViewer/DoomScrollViewer";
 
 interface Props {
   libraryId: number;
 }
 
 export default function FileBrowser({ libraryId }: Props) {
-  const [libraryPaths, setLibraryPaths] = useState<Record<number, string>>({});
+  const [searchParams] = useSearchParams();
+  const [libraryPaths, setLibraryPaths] = useState<Record<number, string>>({
+    [libraryId]: searchParams.get("path") ?? "",
+  });
   const [viewingId, setViewingId] = useState<number | null>(null);
+  const [doomScrollItems, setDoomScrollItems] = useState<MediaItem[] | null>(null);
 
   const currentPath = libraryPaths[libraryId] ?? "";
 
@@ -25,6 +31,17 @@ export default function FileBrowser({ libraryId }: Props) {
     setViewingId(null);
   }
 
+  async function startDoomScroll() {
+    const items = await api.libraries.doomScroll(libraryId, currentPath);
+    setDoomScrollItems([...items].sort(() => Math.random() - 0.5));
+  }
+
+  function handleViewInLibrary(item: MediaItem) {
+    const dirPath = item.rel_path.split("/").slice(0, -1).join("/");
+    navigate(dirPath);
+    setDoomScrollItems(null);
+  }
+
   return (
     <div style={{ padding: "1rem" }}>
       {/* Breadcrumb */}
@@ -43,6 +60,9 @@ export default function FileBrowser({ libraryId }: Props) {
             </span>
           );
         })}
+        <button onClick={startDoomScroll} style={{ marginLeft: "auto", background: "var(--accent)", color: "#fff", border: "none", borderRadius: 4, padding: "4px 10px", cursor: "pointer", fontSize: 13 }}>
+          Doom Scroll
+        </button>
       </nav>
 
       {isLoading && <p style={{ color: "var(--text-secondary)" }}>Loading…</p>}
@@ -94,6 +114,14 @@ export default function FileBrowser({ libraryId }: Props) {
           onNavigate={setViewingId}
         />
       )}
+
+      {doomScrollItems && (
+        <DoomScrollViewer
+          items={doomScrollItems}
+          onClose={() => setDoomScrollItems(null)}
+          onViewInLibrary={handleViewInLibrary}
+        />
+      )}
     </div>
   );
 }

frontend/src/pages/SearchPage.tsx

@@ -1,13 +1,22 @@
 import { useState } from "react";
+import { useNavigate } from "react-router-dom";
 import { useQuery } from "@tanstack/react-query";
 import { api, type MediaItem, type TagsByCategory, type BrowseEntry } from "../api/client";
 import MediaViewer from "../components/MediaViewer/MediaViewer";
+import DoomScrollViewer from "../components/DoomScrollViewer/DoomScrollViewer";
 
 export default function SearchPage() {
+  const routerNavigate = useNavigate();
   const [q, setQ] = useState("");
   const [selectedTags, setSelectedTags] = useState<number[]>([]);
   const [submitted, setSubmitted] = useState(false);
   const [viewingId, setViewingId] = useState<number | null>(null);
+  const [doomScrollItems, setDoomScrollItems] = useState<MediaItem[] | null>(null);
+
+  function handleViewInLibrary(item: MediaItem) {
+    const dirPath = item.rel_path.split("/").slice(0, -1).join("/");
+    routerNavigate(`/library/${item.library_id}?path=${encodeURIComponent(dirPath)}`);
+  }
 
   const { data: grouped = [] } = useQuery<TagsByCategory[]>({
     queryKey: ["tags"],
@@ -78,6 +87,15 @@ export default function SearchPage() {
 
       {isFetching && <p style={{ color: "var(--text-secondary)" }}>Searching…</p>}
 
+      {results.length > 0 && (
+        <button
+          onClick={() => setDoomScrollItems([...results].sort(() => Math.random() - 0.5))}
+          style={{ background: "var(--accent)", color: "#fff", border: "none", borderRadius: 4, padding: "4px 10px", cursor: "pointer", fontSize: 13, marginBottom: 16 }}
+        >
+          Doom Scroll
+        </button>
+      )}
+
       <div style={{ display: "grid", gridTemplateColumns: "repeat(auto-fill, minmax(140px, 1fr))", gap: 12 }}>
         {results.map((item) => (
           <div key={item.id} onClick={() => setViewingId(item.id)} style={{ border: "1px solid var(--border)", borderRadius: 6, overflow: "hidden", background: "var(--bg-card)", cursor: "pointer" }}>
@@ -107,6 +125,14 @@ export default function SearchPage() {
         <p style={{ color: "var(--text-secondary)" }}>No results found.</p>
       )}
 
+      {doomScrollItems && (
+        <DoomScrollViewer
+          items={doomScrollItems}
+          onClose={() => setDoomScrollItems(null)}
+          onViewInLibrary={handleViewInLibrary}
+        />
+      )}
+
       {viewingId !== null && (() => {
         const siblings: BrowseEntry[] = results.map((item) => ({
           name: item.filename,