The import hit a PK violation on (osm_type, osm_id, category): an OSM element
that matches one category through two selectors on different keys (e.g. shelter
= amenity=shelter OR tourism=wilderness_hut, both present) produced two rows for
that category. Add DISTINCT ON (osm_type, osm_id, category) so classification is
one row per (element, category), matching matchingCategoryIds semantics.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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