diff --git a/crates/manager-core/migrations/0058_template_suppressions.sql b/crates/manager-core/migrations/0058_template_suppressions.sql
new file mode 100644
index 0000000..967178a
--- /dev/null
+++ b/crates/manager-core/migrations/0058_template_suppressions.sql
@@ -0,0 +1,36 @@
+-- §11 tail (v1.2 Hierarchies): per-app opt-out of inherited group templates.
+--
+-- A group TRIGGER or ROUTE template inherits to every descendant app. Until now
+-- a descendant could SHADOW a template (declare its own identical binding) but
+-- not DECLINE one. This marker records that a specific app opts OUT of a
+-- specific inherited template — the template then stops resolving for that app
+-- (and only that app; a sibling subtree is unaffected).
+--
+-- Coarse by REFERENCE (not row id — template ids churn on re-apply): a
+-- suppression names a handler SCRIPT NAME (target_kind='trigger') or a PATH
+-- (target_kind='route'). A reference may decline more than one inherited
+-- template (a group that bound several to the same script/path). The dispatch
+-- filters gate to group-owned rows, so an app can only decline what it
+-- INHERITS — never its own trigger/route, never a sibling's.
+--
+-- App-only: only an app suppresses (a group would just not declare the
+-- template). So `app_id NOT NULL` — no polymorphic owner. It is pure app config
+-- (like `extension_points`), so ON DELETE CASCADE (not the code-owner RESTRICT).
+
+CREATE TABLE template_suppressions (
+    id           UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    app_id       UUID NOT NULL REFERENCES apps(id) ON DELETE CASCADE,
+    target_kind  TEXT NOT NULL CHECK (target_kind IN ('trigger', 'route')),
+    -- A handler script name (trigger) or a path (route). Matched
+    -- case-insensitively for triggers (as script-name resolution is
+    -- elsewhere) and exactly for routes; stored as authored.
+    reference    TEXT NOT NULL,
+    created_at   TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- One marker per (app, kind, reference) — re-apply is a NoOp.
+CREATE UNIQUE INDEX template_suppressions_uidx
+    ON template_suppressions (app_id, target_kind, reference);
+
+-- The trigger anti-join / route rebuild both look up by app_id.
+CREATE INDEX template_suppressions_app_idx ON template_suppressions (app_id);
diff --git a/crates/manager-core/tests/expected_schema.txt b/crates/manager-core/tests/expected_schema.txt
index b4299fd..0d1a31e 100644
--- a/crates/manager-core/tests/expected_schema.txt
+++ b/crates/manager-core/tests/expected_schema.txt
@@ -376,6 +376,13 @@ table: secrets
   group_id: uuid NULL
   environment_scope: text NOT NULL default='*'::text
 
+table: template_suppressions
+  id: uuid NOT NULL default=gen_random_uuid()
+  app_id: uuid NOT NULL
+  target_kind: text NOT NULL
+  reference: text NOT NULL
+  created_at: timestamp with time zone NOT NULL default=now()
+
 table: topics
   app_id: uuid NOT NULL
   name: text NOT NULL
@@ -605,6 +612,11 @@ indexes on secrets:
   secrets_app_uidx: public.secrets USING btree (app_id, environment_scope, name) WHERE (app_id IS NOT NULL)
   secrets_group_uidx: public.secrets USING btree (group_id, environment_scope, name) WHERE (group_id IS NOT NULL)
 
+indexes on template_suppressions:
+  template_suppressions_app_idx: public.template_suppressions USING btree (app_id)
+  template_suppressions_pkey: public.template_suppressions USING btree (id)
+  template_suppressions_uidx: public.template_suppressions USING btree (app_id, target_kind, reference)
+
 indexes on topics:
   topics_pkey: public.topics USING btree (app_id, name)
 
@@ -833,6 +845,11 @@ constraints on secrets:
   [FOREIGN KEY] secrets_app_id_fkey: FOREIGN KEY (app_id) REFERENCES apps(id) ON DELETE CASCADE
   [FOREIGN KEY] secrets_group_id_fkey: FOREIGN KEY (group_id) REFERENCES groups(id) ON DELETE CASCADE
 
+constraints on template_suppressions:
+  [CHECK] template_suppressions_target_kind_check: CHECK ((target_kind = ANY (ARRAY['trigger'::text, 'route'::text])))
+  [FOREIGN KEY] template_suppressions_app_id_fkey: FOREIGN KEY (app_id) REFERENCES apps(id) ON DELETE CASCADE
+  [PRIMARY KEY] template_suppressions_pkey: PRIMARY KEY (id)
+
 constraints on topics:
   [CHECK] topics_auth_mode_check: CHECK ((auth_mode = ANY (ARRAY['public'::text, 'token'::text, 'session'::text])))
   [FOREIGN KEY] topics_app_id_fkey: FOREIGN KEY (app_id) REFERENCES apps(id) ON DELETE CASCADE
@@ -913,3 +930,4 @@ constraints on vars:
   0055: group files
   0056: group triggers
   0057: group routes
+  0058: template suppressions