Drift-audit Group 9 (param-cliff / unbounded search work):
- semantic_search_notes: the O(rows) cosine-similarity scoring loop ran
synchronously on the event loop, so every RAG injection / search stalled
other requests proportional to the user's embedding count. Move the scoring
into asyncio.to_thread (results unchanged). The deeper fix — bounding the
candidate set via pgvector ORDER BY/LIMIT — is noted as separate infra work.
- _semantic_knowledge_search: documented the best-effort top-N semantics —
is the capped candidate-window size (not the true match count),
matches beyond the cap aren't page-reachable, and each page recomputes the
full merge. Prevents the silent-truncation trap; cached ranked-id paging /
pgvector is the fix if exhaustive pagination is ever required.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen
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