Fix order of posts

owl/course.py

@@ -164,6 +164,7 @@ def topic_index(sident: str, cident: str, tident: str, student_uid: Optional[int
         .filter(or_(
             db.Post.target_uid == -1,
             db.Post.target_uid == student_uid))
+        .order_by(db.Post.created)
         .options(joinedload(db.Post.author))
     ))