I do the same thing with "no SQL db". The only thing I do differently is not make snapshot of the state but rather replay events to achieve the same state as before (or different t if we migrate to different logic). Also all the changes that are possible are typed events. It wont be a problem to save the state like you do but right now our application changes so often that we have to make sure we can replicate the state even if the logic changes.

Would love to talk to you about this.