Technical notes on trustworthy agent memory on PostgreSQL and pgvector: validity, supersession, calibration and abstention. https://giulioder.github.io/RE-call/blog/ 2026-08-23T18:00:00Z Giulio D'Erme https://giulioder.github.io/RE-call/blog/the-retracted-claim-is-the-nearer-match.html Giulio D'Erme 2026-08-23T18:00:00Z 2026-08-23T18:00:00Z

Agent memory that keeps its history holds both the claim and the correction, and on cosine similarity the retracted claim often wins. One pair of memos from RE-call's shipped demo corpus shows the failure exactly, why a better ranker cannot fix it, and how declared supersession on PostgreSQL and pgvector does: every hit carries a verdict, the stale memo comes back marked superseded, and a question the corpus cannot answer is refused with a measured margin.