I love this idea! I'm logging all changes to data, mostly just for testing/debugging, but I think a "history" endpoint would be handy for this. Not sure what kind of output it should have. Maybe multiple different types, ranging from a plain text dump (one line per change, sorted chronologically) to a JSON object? Not sure.
example: in the `and_then` key, a user (over)writes the next line in a developing narrative. next user repeats. etc. set up a little poller to fetch the key periodically to preserve the history.