Yard and zone soft-delete, refused with 409 while a yard still has
zones or a zone still holds inventory. warehouse_zones:delete was
missing from the catalog — the role presets spread every zone key, so
its absence crashes FreightPositionsSeeder at boot; a migration seeds
it everywhere.
Clicking a zone opens its contents as a datatable. Container identity
comes from booking_container_units for booked cargo and from
containers for backlog registrations; bulk cargo keeps its row with no
container number rather than disappearing from the zone.
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