BLOCKER B1: the fts config swap no longer blindly DROP+ADDs the generated
column. swapEmbeddingsFtsConfig now (1) reads the column's actual generation
expression from pg_catalog and TRUE-no-ops when it already references the target
config (real out-of-band escape hatch), and (2) gates the inline ACCESS
EXCLUSIVE rewrite behind SEARCH_EMBEDDINGS_FTS_INLINE_REWRITE (default 'true';
only a literal 'false' opts out), warning that the operator owns the swap.
up() now creates ru_en only when missing (drop-recreate would fail on the fts
hard dependency on a re-run), so up() is genuinely idempotent. down() guards the
config DROP when fts still references ru_en (gated-off path), staying non-fatal.
W2: corrected the header — Kysely runs EACH migration in its own transaction
(not the whole set in ONE); the single-UPDATE atomicity conclusion is unchanged.
Rewrote the runbook: inline path is a full-table ACCESS EXCLUSIVE rewrite of
page_embeddings; removed the false "IF-EXISTS no-op" claim.
Extends the roundtrip test with idempotent-skip (2nd up() no-op) and env-gate
=false (embeddings rewrite skipped, pages.tsv still swapped) assertions.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
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