There is the NPC memories. You can export them in the settings in game and open it to read it. It only has recent player conversation, a list of events the AI considers memorable, and player’s relationship score for every NPC. The remembered events of an NPC can help you figure out why an NPC might be thinking or saying something, because they do talk to each other once in a while.
Also, I don't believe there is a real umbrella in the game. Though there totally should be one that stops wet on clothes. You likely got a food or drink item named, "Umbrella" as a courtesy since it was raining and when you "used" it you ate or drank the item and the number you saw was the recovered amount. I got a water skin like that.