Seen is what you looked at. Said is what someone told you; people can be wrong. Inferred is what you think. Entries from a history you have changed stay, marked former history.
You arrive a couple of steps away, facing them. Green dots on the plan are things worth a look.
The Long Room door is where the key works. Turn it to choose a year: New Year's Eve 1926, March 1958, April 1991, or back to Maya's 2026. You arrive standing where you stand (unless that place doesn't exist in that year).
Chandler's Court and its people are invented.
What you tell Maya
Saved in Maya's notebook, with this history. Change the past and you can tell her again.