I'm looking forward to using missionary in my project, but as a beginner I have some doubts. Imagine a situation where there is a database in the backend with a large amount of data.The frontend has multiple users connecting at the same time, but the content viewed by each user is different. In other words, the frontend only obtains a subset of the database for display. My problem is that when the database changes, I only want to trigger the relevant parts without propagating to all, but what should I do?