do not use Flask-SQLAlchemy from async tasks

woodwind/models.py

@@ -114,7 +114,6 @@ class Feed(db.Model):
     def get_or_create_push_secret(self):
         if not self.push_secret:
             self.push_secret = uuid.uuid4().hex
-            db.commit()
         return self.push_secret
 
     def __repr__(self):

woodwind/tasks.py

@@ -210,6 +210,8 @@ def check_push_subscription(session, feed, response):
         if hub and topic:
             send_request('subscribe', hub, topic)
 
+        session.commit()
+
 
 def notify_feed_updated(session, feed, entries):
     """Render the new entries and publish them to redis