A group-owned route is a TEMPLATE, expanded into every descendant app's
in-memory RouteTable slice at rebuild (live, no materialization). The
schema reshape mirrors 0056_group_triggers exactly: a nullable group_id
FK→groups ON DELETE RESTRICT (a route template is a binding, not data),
app_id made nullable, an exactly-one owner CHECK, and the per-app unique
binding index split into per-owner partials. A group can't declare two
identical templates; an app declaring an identical binding is a
deliberate shadow resolved at rebuild (nearest-owner-wins), not a DB
conflict. Adds routes_group_id_idx for the expansion join.
Schema blessed at 57 migrations.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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