Interestingly enough, in my entire career so far, for things that weren't cached that should have been or were already cached and working, the one invalidation point was the save page of the entity. Sometimes it's not that hard for vast majority of cases.
Indeed. I’m not even sure the post was talking about cache invalidation, more like what is the correct abstraction by which you cache something.
I only truly understood cache invalidation problems when I read Instagram’s engineering posts - then it dawned on me how hard it is for them to maintain a cached user profile database that has to spread over the entire world for a billion users (and potentially constantly be invalidated as users from around the world like their post etc).
