-- pg_turbovec v1.6.0 -- Phase W: stream heap scan during ambuild.
--
-- This file is a *reference mirror*. The authoritative install
-- script is generated by `cargo pgrx schema`.
--
-- v1.6.0 changes how `ambuild` materialises the f32 vectors
-- coming out of `index_build_range_scan`. Pre-Phase-W we
-- accumulated the entire heap-scan output into a single
-- `Vec<f32>` before handing it to `IdMapIndex::add_with_ids`.
-- At 10 M x 1536-d that buffer alone is 61 GiB, the dominant
-- offender in the 121 GiB peak RSS Phase V observed on the
-- meh host. Phase W flushes the staging buffer into the
-- IdMapIndex every chunk_rows = (0.75 * maintenance_work_mem)
-- bytes, capped at 1 GiB.
--
-- The wire format does NOT change -- the v1.6.0 meta page is
-- byte-identical to v1.5.x (`MetaPageData::version = 3`).
-- There is no DDL or on-disk migration required.
--
-- See docs/UPGRADING.md for the v1.5 -> v1.6 upgrade matrix
-- (no REINDEX needed). Existing v1.5.x indexes continue to
-- work unchanged; the v1.6.0 binary's ambuild path simply uses
-- less memory.
--
-- This migration file exists only so the upgrade path
-- `ALTER EXTENSION pg_turbovec UPDATE TO '1.6.0';` resolves
-- without an error. It is intentionally empty: there are no
-- new SQL objects, no changed signatures, and no removed
-- objects in v1.6.0 vs v1.5.x.