1 Commits

Include renames

Author	SHA1	Message	Date
bvandeusen	f20c019f2a	feat(supersession): demote what a later note overtook, and label it ... Step 3 of #278. First step with visible effect. ## Where the demotion happens, and why not in SQL Applied AFTER the pgvector fetch, over an over-fetched candidate set, not as part of the ORDER BY. Ordering by `distance + penalty` would be exact and would turn an indexed top-k into a scan-and-sort of every embedded note — the HNSW index from migration 0067 can only serve a raw-distance ordering. So the query fetches 3x the requested rows by raw distance and the re-rank happens in Python. Demoting after a LIMIT k with no over-fetch would have been theatre: the cut already happened, so a superseded record pushed down still sits in the results and the live record that should have replaced it was never fetched. The cost is stated in the code: a live record outside the over-fetch window cannot be promoted in. With a 0.05 penalty against neighbours ~0.014 apart, that needs the true answer more than three ranks down, which no observed query approaches. ## Demote, never hide — enforced in three places The penalty applies to the RANKING score, not to the relevance threshold. The floor decides whether a record is relevant at all; the penalty decides which relevant record comes first. Applying it to the floor would drop a superseded record out of the results entirely, which is the one thing this must not do. It is small on purpose. Supersession is a claim about SOME of a record's content, so one that strongly answers a question nothing else answers still surfaces — just behind anything comparable that is current. Its test asserts both bounds, the upper one citing the operator's constraint rather than an optimisation. And every test here that could be satisfied by dropping a record instead asserts the record is still present. ## The dedup gate opts out A superseded record is still a duplicate of what you are about to write — the claim is that it is no longer current, not that it is gone. Demoting it there would let the same note be recorded a second time, and the second copy would be the one nothing warns about. ## The label Auto-inject marks a superseded line SUPERSEDED with a pointer to check the later record. One query for the whole menu. An agent handed stale material with nothing marking it acts on it with full confidence, which is worse than never having surfaced it — the ranking is only half the fix. Fails open: a supersession lookup error returns unpenalised results rather than none, because unpenalised ranking is the behaviour that shipped for months and a broken search is not. Refs #278	2026-08-08 02:00:06 -04:00