Remove deep_rows query

Aim to fix sometimes slow moving of rows. Data from the 'deep' part is
no longer used anyway.

Fixes #258

app/models.py

@@ -364,23 +364,6 @@ class PlaylistRows(dbtables.PlaylistRowsTable):
 
         return session.execute(stmt).unique().scalar_one()
 
-    @classmethod
-    def deep_rows(cls, session: Session, playlist_id: int) -> Sequence["PlaylistRows"]:
-        """
-        Return a list of playlist rows that include full track and lastplayed data for
-        given playlist_id., Sequence
-        """
-
-        stmt = (
-            select(PlaylistRows)
-            .options(joinedload(cls.track))
-            .where(PlaylistRows.playlist_id == playlist_id)
-            .order_by(PlaylistRows.row_number)
-            # .options(joinedload(Tracks.playdates))
-        )
-
-        return session.scalars(stmt).unique().all()
-
     @staticmethod
     def delete_higher_rows(session: Session, playlist_id: int, maxrow: int) -> None:
         """
@@ -486,6 +469,22 @@ class PlaylistRows(dbtables.PlaylistRowsTable):
 
         return plrs
 
+    @classmethod
+    def get_playlist_rows(
+        cls, session: Session, playlist_id: int
+    ) -> Sequence["PlaylistRows"]:
+        """
+        For passed playlist, return a list of rows.
+        """
+
+        plrs = session.scalars(
+            select(cls)
+            .where(cls.playlist_id == playlist_id)
+            .order_by(cls.row_number)
+        ).all()
+
+        return plrs
+
     @classmethod
     def get_rows_with_tracks(
         cls,

app/playlistmodel.py

@@ -991,7 +991,7 @@ class PlaylistModel(QAbstractTableModel):
 
         # Populate self.playlist_rows with playlist data
         self.playlist_rows.clear()
-        for p in PlaylistRows.deep_rows(session, self.playlist_id):
+        for p in PlaylistRows.get_playlist_rows(session, self.playlist_id):
             self.playlist_rows[p.row_number] = RowAndTrack(p)
 
     def refresh_row(self, session, row_number):