We used an existing library called bknr.datastore to handle this part, so we didn't have to reinvent the wheel :) I mentioned that at the end of the blog post,

We used an existing library called bknr.datastore to handle this part, so we didn't have to reinvent the wheel :) I mentioned that at the end of the blog post, but I wanted to build up the idea for people who have no prior knowledge about how such things work.