Thanks, this is an interesting point. Storing the full message indeed has a downside in terms of storage (but for a short text it should be unnoticeable). I guess it also brings something positive: you can select the whole text, delete it, and start again, and the whole action should be stored. Making a diff to represent this is way more complicated.

I'll still think about this though. I think I could find a way to reduce the data size for most use cases.