-- pg_turbovec 1.27.3
--
-- Build-time-only change: the IVF k-means reservoir now stores
-- normalised-but-unrotated rows and rotates the whole training sample
-- once at drain via a parallel BLAS GEMM (ivf::rotate_corpus_into),
-- instead of a scalar O(dim^2) per-row rotation. Measured ~6.3x faster
-- 1M/1024 builds and cleared the 10M build cliff (26 min vs prior DNF).
-- On-disk index format is byte-identical to 1.27.2 (same trained
-- centroids, same codes). No wire change, no SQL surface change, no
-- REINDEX. `ALTER EXTENSION pg_turbovec UPDATE TO '1.27.3';` suffices.