SQL WHERE clause extension. media uses CASE WHEN json_type='text'
to handle both unit (\`"markdown"\`) and tuple (\`{"image":"png"}\`)
MediaType serde shapes. ingested_after relies on RFC3339 lexicographic
ordering with UTC Z (per fb-32 ingest invariant). doc_id is a simple
equality. AND combinator with existing tags / lang / trust filters.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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