Memory that forgets on purpose

Most systems treat memory as storage. Keep everything, search it later. It sounds safe. In practice it produces an archive that grows faster than anyone can trust, where a fact from last year sits next to a fact from this morning with nothing to tell them apart.

That is not how people remember. We keep what still matters, we let the rest fade, and when something old comes up we know it is old. The date is part of the fact.

So in the substrate, every fact carries its date. Not as metadata that gets ignored, but as part of what the fact means. "You live in Hyderabad" and "you lived in Hyderabad until last spring" are different facts, and a system that cannot tell them apart will get you wrong in ways that are hard to notice and easy to resent.

What falls away

A fact that is no longer true should not be deleted. It should be dated. When you say you have moved, the old address does not vanish. It becomes a fact about the past, and the new one becomes a fact about now. Ask what your address was two years ago and the answer is still there. Ask where to send something today and only the current one is used.

Some facts have a natural life. A meeting time, a plan for the weekend, the name of the file you were working on this morning. These carry their dates too, and when their moment passes they stop being offered. They are not gone. They are simply no longer current, and the system knows the difference.

What you choose to keep

The exception is you. Anything you ask to be remembered stays current for as long as you say so, whatever its date. Your mother's birthday does not fade because it was told once. A rule you set about how you like to be spoken to does not expire.

This is the line we hold. Time decides what is stale. You decide what is kept.

Why this is the harder path

It would be easier to keep everything and rank it, and let the archive grow. Dating every fact and reasoning about time is slower to build and less impressive to demo. But it is the only way we know to make a memory that can be trusted over years instead of weeks.

We are early on this. The shape is set: facts that carry their dates, answers that use only what is current, and a way for you to pin what should never fade. The rest, we will show as it works.