container_relations is a generic parent/child graph used by blog
(menu_nodes), market (marketplaces), and events (calendars). Move it
to cart as shared infrastructure. All services now call cart actions
(attach-child/detach-child) instead of querying the table directly.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
giles
1f3d98ecc1