The Evolution of Cache Purging

The performance and the caching at scale, which you are is really interesting because you don't think about it when you're starting out with Django. But in a real project, this is what you spend all your time on. Can you talk about purging the cache, right? Because you warm up the cache, but like, are there some rules or thumbs? Because you don't just keep it forever for listeners who haven't done a lot with caches. So that's an interesting, interesting kind of fun challenge.