You can't just use automerge on the server, it must be used on the client and additionally on the server (or a more cut down version that just replicates deltas

You can't just use automerge on the server, it must be used on the client and additionally on the server (or a more cut down version that just replicates deltas between peers). If you are going to try out automerge you should also take a look at y.js and diamond-types.