-- pg_turbovec v1.22.2 -- default `turbovec.probes` raised 8 -> 16.
-- Scan-side default change only. No wire format change, no SQL
-- surface change.
--
-- This file is a *reference mirror*. The authoritative install
-- script is generated by `cargo pgrx schema`.
--
-- Background: the v1.22.1 a cloud VM re-benchmark (competitive comparison
-- against pgvector HNSW / pgvectorscale DiskANN, same session that
-- validated the k-means GEMM parallelism fix) measured pg_turbovec's
-- OUT-OF-THE-BOX defaults (probes=8, search_k=32) at R@10=0.796 on
-- SIFT-1M and R@10=0.407 on GIST-1M -- both well below any reasonable
-- recall SLO. `probes=16` (still `search_k=32`) measured R@10=0.918
-- on SIFT-1M and R@10=0.557 on GIST-1M for roughly 1.5-1.6x the
-- latency (3.0ms->4.8ms on SIFT-1M; 18.5ms->20.4ms on GIST-1M) --
-- the better point on the recall/latency curve for a default that
-- most users will never tune.
--
-- Existing sessions/deployments that explicitly `SET turbovec.probes`
-- (in postgresql.conf or per-session) are UNAFFECTED -- this only
-- changes the compiled-in default for sessions that never set it.
--
-- No wire-format change (MetaPageData::version stays 5). No SQL
-- surface change (no new/removed GUC, no reloption change). No
-- REINDEX. `ALTER EXTENSION pg_turbovec UPDATE TO '1.22.2';` is
-- sufficient.
--
-- (intentionally empty beyond this note -- there is no DDL to run.)