Joseph Doherty fa86750717 feat(templates): phase 2 — derive-on-compose for new compositions ...

AddCompositionAsync creates a derived Template ("<parent>.<slot>") that
inherits from the base via ParentTemplateId. Base attributes and scripts
are copied with IsInherited=true so the derived template carries its own
override-able rows. The composition row points at the derived template,
and the derived's OwnerCompositionId back-refs the composition for cascade
delete.

DeleteCompositionAsync cascade-deletes the owned derived template.
DeleteTemplateAsync blocks direct deletion of derived templates and
distinguishes derivatives from regular children, listing slot owners
("'Pump' (as 'TempSensor')") in the error.

Composing a derived template is rejected — only bases can be composed.
Existing compositions still resolve until phase 3 migrates them.

2026-05-12 08:27:13 -04:00

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