feat(callback): add callback

scripts/db/verify/0007_oauth_clients.sql

@@ -0,0 +1,15 @@
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1
+    FROM information_schema.tables
+    WHERE table_schema = 'public' AND table_name = 'oauth_clients'
+  ) THEN
+    RAISE EXCEPTION 'missing oauth_clients table';
+  END IF;
+
+  IF NOT EXISTS (SELECT 1 FROM permissions WHERE code = 'iam:client:write') THEN
+    RAISE EXCEPTION 'missing iam client permissions seed';
+  END IF;
+END $$;
+