I have implemented something similar (updating projection from background and serving the projection automatically via REST) and wrote a high-Level article abou

I have implemented something similar (updating projection from background and serving the projection automatically via REST) and wrote a high-Level article about it https://www.fabianzeindl.com/posts/the-api-database-architecture https://www.fabianzeindl.com/posts/the-api-database-architec...