The per-media path (_apply_sidecar) and the post-record path (upsert_post_record)
each carried a VERBATIM copy of the post-field write (url/title/date/description/
attachment_count/raw_metadata + external-link sync). Two copies of one concept =
the divergence risk #753 targets. Consolidate into one _apply_post_fields(post,
sd) helper both call — a single predicate for how a post body/links get stored,
so the two sources can't drift. Behavior identical (fill-with-non-empty); both
paths already covered by existing importer tests.
Groundwork for the planned post-first ingest model (single authoritative post
record; media attaches to it) as more platforms move onto the native ingester.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
bvandeusen
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