Drafts, including unpublished ones. A consumer materialising this map gets the editorial pipeline's contents, which the page export deliberately does not carry.
Subjects are templated from entity.slug, which is the column the database keys on. The export mints its @id from the display name instead, so the two agree until a name is edited without re-slugging — this mapping describes the database, not the export.
The EAV table. The predicate is templated from the `field` column because the field name IS the property — a fixed predicate would collapse every stored value into one multi-valued blob.