Litestream author here. Litestream monitors and replicates based off the WAL and there are some tricks it has to do to make that work. However, it doesn't currently decode those WAL pages and determine the changed data.

That is something that's on the roadmap though: https://github.com/benbjohnson/litestream/issues/129

This is awesome! I guess more likely given the title of this post, but still pretty cool that the author of a library is here in the comments.