feat: add NAS management UI and operation history

am_deduper/scanner.py

@@ -34,7 +34,12 @@ def index_file(conn, path: Path) -> None:
 
 def scan(root: Path, db_path: Path) -> int:
     count = 0
+    seen = set()
     with connect(db_path) as conn:
         for path in iter_music(root):
-            index_file(conn, path); count += 1
+            index_file(conn, path); seen.add(str(path)); count += 1
+        rows = conn.execute("SELECT id,file_path,status FROM audio_tracks WHERE status!='missing'").fetchall()
+        for row in rows:
+            if row["file_path"] not in seen and not Path(row["file_path"]).exists():
+                conn.execute("UPDATE audio_tracks SET status='missing',updated_at=CURRENT_TIMESTAMP WHERE id=?", (row["id"],))
     return count