Yeah, it's troubling for sure. I think constructing a more secure nighttime space for them, continuing to use the treadle feeders and clean up feed as much as possible, then trying to close up the rat holes once they leave?
The rat numbers are definitely dwindling. The population was huge, went down when I got the treadle feeders, had a boom again when I had chicks (and thus feed out), and now seems to be dropping. What I've read suggests that rats will not breed as much in the winter, so I'm hoping the combo of no food and cold temps will knock the population down even more.
I think that I need to fully dig out the perimeter around the run (which, UGH, is going to be over 50 feet of digging) and install a really good apron. But realistically that will have to be a spring/summer project. The ground is already getting too hard to dig easily.
But building them a "safe room" this weekend is definitely on the agenda. At the very least I want to give them more security at night.