§4.5 of the groups/project-tool design. A group declares a route ONCE; the
tree apply fans it out into one concrete per-app_id route on every descendant
app — instantiation, not inheritance (the cross-app isolation boundary is
unchanged; expanded rows stay app-owned).
- Migration 0053: `route_templates` table (group-owned) + `routes.from_template`
provenance column + index.
- `template_repo.rs`: tx-aware CRUD + chain-load (mirrors group_repo/route_repo).
- Manifest: `[group]` `[[route_templates]]`; build_bundle emits them; rejected
on an app node (422).
- Apply: group nodes reconcile template rows (create/update/delete via the
plan); tree Phase B expands each chain template into a concrete route per
descendant app node — placeholders {app_slug}/{env}/{var:NAME} resolved per
app (unknown var/placeholder = hard error), script bound nearest-owner-wins.
Idempotent via from_template (diffed create/update-as-replace/delete; re-apply
is no-churn, --prune reaps expansions). Collision with a hand-declared route,
or between two templates, is a hard error. Each RESOLVED expansion is
validated like a hand-declared route (reserved-path, path/host parse,
host-claim) so a {var:}-injected path or unclaimed strict host can't slip in.
- Plan: route-template diff at the group node + blast-radius (descendant app
count in this apply); state_token folds each template (edit trips StateMoved).
- Authz: declaring → GroupScriptsWrite; an app receiving expansions →
AppWriteRoute (gated even with no hand-declared routes).
- Tests: tests/templates.rs (fan-out + per-slug + idempotent-stable-ids +
prune-reap + collision-rejected); placeholder/validation unit tests; schema
golden reblessed.
Reviewed (no CRITICAL/HIGH; isolation core verified sound). Closed the two
validation-parity MEDIUMs (host-claim + reserved-path/pattern on expansions)
and added an out-of-apply-descendant prune warning. Scope: expansion targets
app nodes in the tree apply (not yet cross-repo descendants); {var:NAME} uses
committed vars. M4b (trigger templates) reuses this engine next.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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