I keep a detailed record on excell program on the dates the snake ate, shed dates and even poop date. With keeping several types of snakes, documenting everything answers a lot of questions about each snake. It also shows patterns. In the data mine shows size of feeding item and amount eaten, so I can see when the snake graduated up to different size items, like eating med size rats to know eating med/large rats.
It takes a bit of time to set up, but once it is done and customized to your set up you will be glad you took the time.
THE RETICULATED PYTHON