Review fixes for the #2754 takeover:
1. content_created_at was ranked ABOVE event_date/date/published/filename
while both in-tree writers (import-file, the backfill script) derive it
from frontmatter.created — the chain's explicitly WEAKEST content
signal. Import computed source='date' for a created+date page, then the
first 'gbrain reindex-frontmatter' (which reads the persisted column)
silently flipped effective_date to the created value. The column now
ranks just above the frontmatter.created rung (still repairs the
incident class: created-only pages beat the row-timestamp fallback),
and import passes contentCreatedAt through so import and reindex
compute identical results. Regression test added.
2. ESCAPE '\\' (2-char escape string) made every --slug-prefix run die
with "invalid escape string" — in the new backfill script and the
pre-existing copy in backfill-effective-date.ts. Both now send a
single-char escape. Verified against PGLite.
3. Scrubbed a personal-brain entity slug from test/effective-date.test.ts
per the repo privacy rule (generic placeholder instead).
typecheck clean; 412 tests across the touched suites pass; jsonb guards
clean; end-to-end PGLite smoke (fresh bootstrap + v125 migration + script
step 1 with --slug-prefix + effective_date re-walk) verified.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
