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Sqlalchemy query not consistent between multi tornado instances
topics = self.db.query(Topic).order_by(Topic.updated_at.desc()).limit(20)

class Application(tornado.web.Application):
def __init__(self):
    # setup app
    from urls import handlers,ui_modules
    settings = dict(
        debug = options.debug,
        static_path = os.path.join(root_dir, "static"),
        xsrf_cookies = True,
        cookie_secret = "nzjxcjasduuqwheazmu293nsadhaslzkci9023nsadnua9sdads/Vo=",
        ui_modules = ui_modules,
    )
    tornado.web.Application.__init__(self, handlers, **settings)

    self.db = scoped_session(sessionmaker(bind=engine,autocommit=False,autoflush=False))

class BaseHandler(web.RequestHandler):
    @property
    def db(self):
        return self.application.db

topic = Topic()
topic.title = u'abcdefg'
self.db.add(topic)
self.db.commit()