I will admit it, this is by far the hardest challenge until today.
We broke it nearly every other day. Today it was for my own project, but still this doesn't go as planned. I guess we will need to put some thought into that. Find the "root" cause and do something about it.
Today I worked again on some pandas stuff, a library in my favorite programming language python. It's really fun to go through different approaches and see what works when, and how tactics differ. I am really looking forward learning more again in that area. It's also helpful for my current side project as it will contain reports and analysis at some point.