A company runs a web application as a set of containers on Amazon ECS with the Fargate launch type behind an Application Load Balancer. The application stores user session data in the local memory of each container. During scale-in events triggered by an Auto Scaling policy, users are frequently logged out and lose their shopping cart contents. The team wants to make the containers fully stateless so they can be scaled in and out or replaced without affecting user sessions. Which approach best meets this requirement?