fixed some bugs

sentence_api/repository.py

@@ -1118,6 +1118,47 @@ class VideoRepository:
             ).fetchall()
         return [dict(row) for row in rows]
 
+    def delete_user_result(self, user_id: str, attempt_id: str) -> Optional[Dict[str, Any]]:
+        """Delete one attempt owned by the user and return its stored audio filename."""
+        with self._connect() as connection:
+            row = connection.execute(
+                """
+                SELECT audio_filename FROM attempts
+                WHERE attempt_id = ? AND user_id = ?
+                """,
+                (attempt_id, user_id),
+            ).fetchone()
+            if row is None:
+                return None
+            connection.execute(
+                "DELETE FROM attempts WHERE attempt_id = ? AND user_id = ?",
+                (attempt_id, user_id),
+            )
+        return {"audio_filename": row["audio_filename"]}
+
+    def delete_user_dub_share(self, user_id: str, share_id: str) -> Optional[List[str]]:
+        """Delete one dub share owned by the user and return stored audio filenames."""
+        with self._connect() as connection:
+            share = connection.execute(
+                "SELECT share_id FROM dub_shares WHERE share_id = ? AND user_id = ?",
+                (share_id, user_id),
+            ).fetchone()
+            if share is None:
+                return None
+            filenames = [
+                row["audio_filename"]
+                for row in connection.execute(
+                    "SELECT audio_filename FROM dub_share_segments WHERE share_id = ?",
+                    (share_id,),
+                ).fetchall()
+            ]
+            # Segments are removed by ON DELETE CASCADE.
+            connection.execute(
+                "DELETE FROM dub_shares WHERE share_id = ? AND user_id = ?",
+                (share_id, user_id),
+            )
+        return filenames
+
     def delete_video(self, video_hash: str) -> Optional[Dict[str, Any]]:
         video = self.get_video(video_hash)
         if video is None: