Reviewing the T-1038 road-graph hub model surfaced that corp HQs are
cross-referenced into atlas_city_names as reserved rows — one per corp —
producing duplicate co-named "cities" (e.g. 10 'Groombridge' rows on
GJ380c) that the spatial layers place as separate settlements.
D-242 resolves the data model: corp HQs are not cities. The HQ relationship
lives with the corp; placement is a baked, specialization-keyed preference
(CityTenant vs Standalone, since corp_type is degenerate); population and
settlement_class are install-baked with only position seed-derived. This
supersedes the D-223 corp-HQ-cross-ref and deferred-pop/class notes.
Companion tickets under T-750: T-1074 (corp-HQ model / remove the cross-ref /
specialization map / standalone HQ settlements), T-1075 (bake per-settlement
population + settlement_class), T-1076 (road-graph hub refinement — scaled-cap
hubs, co-location collapse, hybrid minor attach, deferred RailHeadFacing pass;
blocked on T-1074 + T-1075). T-1038 annotated with shipped-vs-deferred.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
301be77b49