A group TRIGGER/ROUTE template inherits to every descendant app; until now
a descendant could shadow one but not decline it. This marker records that
an app opts OUT of a specific inherited template — coarse by REFERENCE (a
handler script name for triggers, a path for routes), not row id (template
ids churn on re-apply, references are stable so re-apply is a NoOp).
App-only (a group would just not declare the template) → app_id NOT NULL,
no polymorphic owner; pure app config → ON DELETE CASCADE. A target_kind
discriminator ('trigger'|'route') keeps it one table, one reconcile loop.
Schema blessed at 58 migrations.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
18ac9f5afa