fix delete_parsed_data to accept data_type argument

chatkit/backend/app/database.py

@@ -252,9 +252,14 @@ async def get_parsed_data(session_id: int) -> list[dict]:
         return [_row(p) for p in res.scalars().all()]
 
 
-async def delete_parsed_data(session_id: int):
+async def delete_parsed_data(session_id: int, data_type: str):
     async with get_sessionmaker()() as db:
-        await db.execute(delete(ParsedData).where(ParsedData.quiz_id == session_id))
+        await db.execute(
+            delete(ParsedData).where(
+                ParsedData.quiz_id == session_id,
+                ParsedData.data_type == data_type,
+            )
+        )
         await db.commit()