PowerSync has an article on using Postgres with Yjs (and perhaps look into Yrs, the Rust implementation, as well as other Rust crates like Loro and Automerge that are much faster) and they use a table in the database that stores the changes, is that what you are doing too [0]?

[0] https://www.powersync.com/blog/postgres-and-yjs-crdt-collabo...