diff --git a/linedance-app/local/acoustid_worker.py b/linedance-app/local/acoustid_worker.py
index 30b99890..b9f95d6b 100644
--- a/linedance-app/local/acoustid_worker.py
+++ b/linedance-app/local/acoustid_worker.py
@@ -159,11 +159,11 @@ def run_acoustid_scan(db_path: str, api_key: str = "", on_progress=None, stop_ev
         conn.row_factory = sqlite3.Row
 
         rows = conn.execute("""
-            SELECT id, local_path, title, artist
-            FROM songs
-            WHERE (mbid IS NULL OR mbid = '')
-            AND file_missing = 0
-            AND local_path IS NOT NULL AND local_path != ''
+            SELECT s.id, s.title, s.artist, f.local_path
+            FROM songs s
+            JOIN files f ON f.song_id = s.id AND f.file_missing = 0
+            WHERE (s.mbid IS NULL OR s.mbid = '')
+            AND f.local_path IS NOT NULL AND f.local_path != ''
             ORDER BY RANDOM()
             LIMIT ?
         """, (MAX_PER_SESSION,)).fetchall()
@@ -284,4 +284,4 @@ class AcoustIDWorker:
         self._stop_event.set()
 
     def is_running(self) -> bool:
-        return self._running
+        return self._running
\ No newline at end of file
diff --git a/linedance-app/local/scanner.py b/linedance-app/local/scanner.py
index 2af684ca..b85a5817 100644
--- a/linedance-app/local/scanner.py
+++ b/linedance-app/local/scanner.py
@@ -11,6 +11,62 @@ from pathlib import Path
 logger = logging.getLogger(__name__)
 
 SUPPORTED = {'.mp3', '.flac', '.m4a', '.ogg', '.wav', '.aiff', '.wma'}
+import uuid as _uuid_module
+
+
+def _find_or_create_song_conn(conn, title, artist, album, bpm,
+                               duration_sec, mbid, acoustid) -> str:
+    """Find eller opret sang via eksisterende forbindelse."""
+    if mbid:
+        row = conn.execute("SELECT id FROM songs WHERE mbid=?", (mbid,)).fetchone()
+        if row:
+            return row["id"]
+    if acoustid:
+        row = conn.execute("SELECT id FROM songs WHERE acoustid=?", (acoustid,)).fetchone()
+        if row:
+            if mbid:
+                conn.execute("UPDATE songs SET mbid=? WHERE id=? AND mbid IS NULL", (mbid, row["id"]))
+            return row["id"]
+    if title:
+        row = conn.execute(
+            "SELECT id FROM songs WHERE title=? AND artist=?", (title, artist)
+        ).fetchone()
+        if row:
+            if mbid:
+                conn.execute("UPDATE songs SET mbid=? WHERE id=? AND mbid IS NULL", (mbid, row["id"]))
+            return row["id"]
+    new_id = str(_uuid_module.uuid4())
+    conn.execute(
+        "INSERT INTO songs (id, title, artist, album, bpm, duration_sec, mbid, acoustid) "
+        "VALUES (?,?,?,?,?,?,?,?)",
+        (new_id, title, artist, album, bpm, duration_sec, mbid or None, acoustid or None)
+    )
+    return new_id
+
+
+def _upsert_file_conn(conn, song_id, local_path, file_format,
+                       file_modified_at, extra_tags) -> str:
+    """Opret eller opdater fil-post via eksisterende forbindelse."""
+    existing = conn.execute(
+        "SELECT id FROM files WHERE local_path=?", (local_path,)
+    ).fetchone()
+    if existing:
+        conn.execute("""
+            UPDATE files SET song_id=?, file_missing=0,
+                file_format=?, file_modified_at=?, extra_tags=?
+            WHERE id=?
+        """, (song_id, file_format, file_modified_at, extra_tags, existing["id"]))
+        return existing["id"]
+    else:
+        file_id = str(_uuid_module.uuid4())
+        conn.execute(
+            "INSERT INTO files (id, song_id, local_path, file_format, file_modified_at, extra_tags) "
+            "VALUES (?,?,?,?,?,?)",
+            (file_id, song_id, local_path, file_format, file_modified_at, extra_tags)
+        )
+        return file_id
+
+
 
 
 def is_supported(path) -> bool:
@@ -33,7 +89,6 @@ def scan_library(library_id: int, library_path: str, db_path: str,
     """
     import sqlite3
     from local.tag_reader import read_tags
-    from local.local_db import find_or_create_song, upsert_file
 
     base = Path(library_path)
     if not base.exists():
@@ -84,16 +139,16 @@ def scan_library(library_id: int, library_path: str, db_path: str,
             acoustid = tags.get("acoustid", "")
             duration_sec = tags.get("duration_sec", 0)
             file_format  = tags.get("file_format", fp.suffix.lstrip(".").lower())
-            extra_tags   = tags.get("extra_tags", "{}")
+            import json as _json
+            _extra = tags.get("extra_tags", {})
+            extra_tags = _json.dumps(_extra) if isinstance(_extra, dict) else (_extra or "{}")
 
-            # Find eller opret sang i global katalog
-            song_id = find_or_create_song(
-                title=title, artist=artist, album=album,
-                bpm=bpm, duration_sec=duration_sec,
-                mbid=mbid, acoustid=acoustid,
+            # Find eller opret sang — alt via samme conn
+            song_id = _find_or_create_song_conn(
+                conn, title, artist, album, bpm, duration_sec, mbid, acoustid
             )
 
-            # Opdater BPM på sangen hvis vi har bedre data
+            # Opdater BPM
             if bpm and bpm > 0:
                 conn.execute(
                     "UPDATE songs SET bpm=? WHERE id=? AND (bpm=0 OR bpm IS NULL)",
@@ -101,13 +156,7 @@ def scan_library(library_id: int, library_path: str, db_path: str,
                 )
 
             # Opret eller opdater fil-post
-            upsert_file(
-                song_id=song_id,
-                local_path=path_str,
-                file_format=file_format,
-                file_modified_at=mtime,
-                extra_tags=extra_tags,
-            )
+            _upsert_file_conn(conn, song_id, path_str, file_format, mtime, extra_tags)
 
             # Dans-tags fra fil
             file_dances = tags.get("dances", [])
diff --git a/linedance-app/ui/library_manager.py b/linedance-app/ui/library_manager.py
index b10d6aba..8a52ef64 100644
--- a/linedance-app/ui/library_manager.py
+++ b/linedance-app/ui/library_manager.py
@@ -79,7 +79,7 @@ class LibraryManagerDialog(QDialog):
             conn = sqlite3.connect(self._db_path)
             conn.row_factory = sqlite3.Row
             libs = conn.execute(
-                "SELECT id, path, last_full_scan FROM libraries "
+                "SELECT id, path FROM libraries "
                 "WHERE is_active=1 ORDER BY path"
             ).fetchall()
 
@@ -87,15 +87,16 @@ class LibraryManagerDialog(QDialog):
             bpm_missing = {}
             for lib in libs:
                 counts[lib["id"]] = conn.execute(
-                    "SELECT COUNT(*) FROM songs "
-                    "WHERE library_id=? AND file_missing=0",
-                    (lib["id"],)
+                    "SELECT COUNT(*) FROM files "
+                    "WHERE file_missing=0 AND local_path LIKE ?",
+                    (lib["path"] + "%",)
                 ).fetchone()[0]
                 bpm_missing[lib["id"]] = conn.execute(
-                    "SELECT COUNT(*) FROM songs "
-                    "WHERE library_id=? AND file_missing=0 "
-                    "AND (bpm IS NULL OR bpm=0)",
-                    (lib["id"],)
+                    "SELECT COUNT(*) FROM files f "
+                    "JOIN songs s ON s.id = f.song_id "
+                    "WHERE f.file_missing=0 AND f.local_path LIKE ? "
+                    "AND (s.bpm IS NULL OR s.bpm=0)",
+                    (lib["path"] + "%",)
                 ).fetchone()[0]
             conn.close()
 
@@ -122,9 +123,7 @@ class LibraryManagerDialog(QDialog):
         lib_id = lib["id"]
         path   = lib["path"]
         exists = Path(path).exists()
-        last   = lib.get("last_full_scan") or "aldrig"
-        if isinstance(last, str) and len(last) > 16:
-            last = last[:16]
+        last   = "—"
 
         frame = QFrame()
         frame.setObjectName("track_display")
@@ -246,11 +245,12 @@ class LibraryManagerDialog(QDialog):
 
         try:
             conn = sqlite3.connect(self._db_path)
-            # Slet sange fra biblioteket
+            # Marker filer fra denne mappe som missing
             conn.execute(
-                "DELETE FROM songs WHERE library_id=?", (lib["id"],)
+                "UPDATE files SET file_missing=1 WHERE local_path LIKE ?",
+                (lib["path"] + "%",)
             )
-            # Slet selve biblioteks-rækken helt
+            # Slet selve biblioteks-rækken
             conn.execute(
                 "DELETE FROM libraries WHERE id=?", (lib["id"],)
             )
@@ -297,4 +297,4 @@ class LibraryManagerDialog(QDialog):
         for w in list(self._workers.values()):
             w.cancel()
             w.wait(2000)  # Vent max 2 sek på at tråden stopper
-        event.accept()
+        event.accept()
\ No newline at end of file
diff --git a/linedance-app/ui/main_window.py b/linedance-app/ui/main_window.py
index 78e8d0bf..44dadf67 100644
--- a/linedance-app/ui/main_window.py
+++ b/linedance-app/ui/main_window.py
@@ -505,19 +505,19 @@ class MainWindow(QMainWindow):
             conn.row_factory = sqlite3.Row
             rows = conn.execute("""
                 SELECT s.id, s.title, s.artist, s.album, s.bpm,
-                       s.duration_sec, s.local_path, s.file_format,
-                       s.file_missing,
+                       s.duration_sec,
+                       f.id as file_id, f.local_path, f.file_format, f.file_missing,
                        GROUP_CONCAT(d.name, ',')                        AS dance_names,
                        GROUP_CONCAT(COALESCE(dl.name,''), ',')          AS dance_levels,
                        GROUP_CONCAT(COALESCE(d.choreographer,''), ',')  AS dance_choreographers,
                        GROUP_CONCAT(DISTINCT ad.name)                   AS alt_dance_names
                 FROM songs s
+                JOIN files f               ON f.song_id = s.id AND f.file_missing = 0
                 LEFT JOIN song_dances sd   ON sd.song_id = s.id
                 LEFT JOIN dances d         ON d.id = sd.dance_id
                 LEFT JOIN dance_levels dl  ON dl.id = d.level_id
                 LEFT JOIN song_alt_dances sad ON sad.song_id = s.id
                 LEFT JOIN dances ad        ON ad.id = sad.dance_id
-                WHERE s.file_missing = 0
                 GROUP BY s.id
                 ORDER BY s.artist, s.title
             """).fetchall()
@@ -536,6 +536,7 @@ class MainWindow(QMainWindow):
                     "album":                 row["album"],
                     "bpm":                   row["bpm"],
                     "duration_sec":          row["duration_sec"],
+                    "file_id":               row["file_id"],
                     "local_path":            row["local_path"],
                     "file_format":           row["file_format"],
                     "file_missing":          bool(row["file_missing"]),
@@ -1476,4 +1477,4 @@ class MainWindow(QMainWindow):
                 self._watchdog_proc.terminate()
             except Exception:
                 pass
-        event.accept()
+        event.accept()
\ No newline at end of file