add responding to thread

app/models.py

@@ -167,6 +167,12 @@ class Threads(Model):
         q = Posts.FULL_POSTS_QUERY + " WHERE posts.thread_id = ? ORDER BY posts.created_at ASC LIMIT ? OFFSET ?"
         return db.query(q, self.id, limit, offset)
 
+    def locked(self):
+        return bool(self.is_locked)
+
+    def stickied(self):
+        return bool(self.is_stickied)
+
 class Posts(Model):
     FULL_POSTS_QUERY = """
         SELECT