Letting Things Fade

You are adding forgetting to a memory store that has grown past what retrieval can rank well. Which approaches are sound? Select all that apply.

Delete any memory that has not been retrieved in the last 24 hours, so the store stays small enough for ranking to work

Skip decay and raise top-k instead, so older memories are outnumbered by newer ones in the results

Multiply the retrieval score by an exponential decay on time since the memory was last retrieved or reconfirmed

Keep a pinned class of durable facts, such as hard constraints and allergies, exempt from decay entirely

Evict strictly first in, first out once the per-user cap is reached, regardless of how often a row is used