diff --git a/backend/seeds/seed_001_cleanup_pytest_artifacts.dev.sql b/backend/seeds/seed_001_cleanup_pytest_artifacts.dev.sql
index c52b7fa..5de90ba 100644
--- a/backend/seeds/seed_001_cleanup_pytest_artifacts.dev.sql
+++ b/backend/seeds/seed_001_cleanup_pytest_artifacts.dev.sql
@@ -4,6 +4,21 @@
 -- Reparatur: ungültige Human-Actors (user_id NULL verletzt CHECK constraint)
 DELETE FROM actors WHERE actor_type = 'human' AND user_id IS NULL;
 
+-- AP0.5: Vorhaben/Maßnahmen pytest-Artefakte vor Actor-Löschung entfernen
+-- (initiatives.owner_actor_id → actors ON DELETE RESTRICT)
+DELETE FROM initiatives
+WHERE owner_actor_id IN (
+    SELECT id FROM actors WHERE user_id IN (SELECT id FROM users WHERE email ~* '@example\.com$')
+);
+
+DELETE FROM initiatives i
+USING tenants t
+WHERE i.tenant_id = t.id
+  AND t.slug ~ '^t-[a-f0-9]{10}$'
+  AND NOT EXISTS (
+      SELECT 1 FROM tenant_memberships tm WHERE tm.tenant_id = t.id
+  );
+
 -- Abhängigkeiten vor User-Löschung (human actors: user_id NOT NULL constraint)
 DELETE FROM actors
 WHERE user_id IN (SELECT id FROM users WHERE email ~* '@example\.com$');