Ably’s LiveSync (https://ably.com/livesync) is conceptually designed to solve exactly this problem by providing a database connector that subscribes to changes committed using the outbox pattern, and a models SDK to subscribe to those changes in your app. It’s early days as it’s just been released, but at the core the team’s goal in designing that was to solve this exact problem. Interested if this is meets your needs? Disclaimer. I am the co-founder of Ably.