Add canvas size disable controls

test/templates.test.js

@@ -124,6 +124,30 @@ test('buildTemplatePayload resolves canvas size and rejects duplicate region nam
   );
 });
 
+test('disabled canvas sizes cannot be assigned to new templates but existing assignments can be retained', async () => {
+  const pool = {
+    async query() {
+      return [[{ id: 4, name: 'Legacy', width: 1280, height: 720, enabled: 0 }]];
+    }
+  };
+  const req = {
+    body: {
+      name: 'Legacy template',
+      canvas_size_id: '4',
+      regions_json: JSON.stringify([{ region_name: 'Body', region_type: 'text' }])
+    },
+    files: []
+  };
+
+  await assert.rejects(
+    () => buildTemplatePayload(pool, req, null),
+    (error) => error && error.statusCode === 400 && error.message === 'Canvas size is disabled.'
+  );
+
+  const payload = await buildTemplatePayload(pool, req, { canvas_size_id: 4 });
+  assert.equal(payload.canvasSizeId, 4);
+});
+
 test('buildDuplicateTemplate copies template fields and strips row identity', () => {
   const duplicate = buildDuplicateTemplate({
     id: 9,