screenshot compression right now just uses the PIL.Image options that I found give a screenshot size of around 10 kilobytes. But I'm sure this can be much improved, to decrease size and/or improve readability of the text.

One wild idea would be to recognize the text parts of the screen (using the bounding boxes produced by tessaract), and then to compress those parts using one algorithm (that compresses on-screen text well, and compress the other parts using another algorithm, and then to paste these two compressions together (either when saving to the database, or store them seperately and paste them together only while recalling from database). this is cool, might be overengineering.