prevent running migrations if is_fresh_install

+ fix: sqlite3.ProgrammingError: Cannot operate on a closed cursor on ProcessAlbumColors()
+ move processing artist images from periodic_scans to Populate
+ bump hash string limit from 7 to 10
+ add last_mod property to database
+ fix: TypeError: '<' not supported between instances of 'int' and 'str' on album page

app/db/sqlite/tracks.py

@@ -34,11 +34,12 @@ class SQLiteTrackMethods:
             filepath,
             folder,
             genre,
+            last_mod,
             title,
             track,
             trackhash
             ) VALUES(:album, :albumartist, :albumhash, :artist, :bitrate, :copyright, 
-            :date, :disc, :duration, :filepath, :folder, :genre, :title, :track, :trackhash)
+            :date, :disc, :duration, :filepath, :folder, :genre, :last_mod, :title, :track, :trackhash)
             """
 
         track = OrderedDict(sorted(track.items()))
@@ -83,12 +84,16 @@ class SQLiteTrackMethods:
             return None
 
     @staticmethod
-    def remove_track_by_filepath(filepath: str):
+    def remove_tracks_by_filepaths(filepaths: str | list[str]):
         """
-        Removes a track from the database using its filepath.
+        Removes a track or tracks from the database using their filepaths.
         """
+        if isinstance(filepaths, str):
+            filepaths = [filepaths]
+
         with SQLiteManager() as cur:
-            cur.execute("DELETE FROM tracks WHERE filepath=?", (filepath,))
+            for filepath in filepaths:
+                cur.execute("DELETE FROM tracks WHERE filepath=?", (filepath,))
 
     @staticmethod
     def remove_tracks_by_folders(folders: set[str]):