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What we found by running it.

Four notes from building a memory layer. Mostly the decisions that were hard to reverse, and one bug that a green test suite was never going to catch.

Long grass cut into narrow bands of light
Ingestion6 min read

Eighty characters of signal, and no memories at all

A bounded regex meant the extractor could read a short sentence and nothing longer. 521 ingestion tests passed against a detector that produced nothing from an ordinary paragraph.

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A row of old brass keys hanging on hooks
Auth5 min read

Re-authorising an account revokes the connection before it

Disconnecting inside ChatGPT tells us nothing. The only signal we ever get that a connection is over is the person making a new one, so making a new one has to end the old one.

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An industrial electrical panel with rows of switches
Reliability7 min read

Circuit breakers that hold work instead of dropping it

When the model that reads a scanned page is down, refusing the upload solves our problem by losing the user's. The bytes go to storage, the job waits in Postgres, and the person gets told.

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Deep shelves of bound archive volumes receding into shadow
Memory model7 min read

Superseded, not overwritten, so March is still there

When a memory changes, the old one gains an end date and a pointer forward. Both survive, which is what lets one store answer both what is true now and what was true then.

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