fix(frontend): 504 total en prod — conflicto de slugs [id]/[family_id] en Next

frontend/src/app/api/v2/defects/[family_id]/label/route.ts → frontend/src/app/api/v2/defects/[id]/label/route.ts

@@ -1,10 +1,14 @@
 import { NextRequest } from "next/server";
+
 import { proxyToBackend } from "@/lib/server/proxy";
 
-export async function PATCH(request: NextRequest, { params }: { params: Promise<{ family_id: string }> }) {
-  const { family_id } = await params;
+// Slug `[id]` (no `[family_id]`): Next.js exige un único nombre de slug por
+// posición; tener `defects/[id]` y `defects/[family_id]` a la vez crashea el
+// runtime entero ("cannot use different slug names for the same dynamic path").
+export async function PATCH(request: NextRequest, { params }: { params: Promise<{ id: string }> }) {
+  const { id } = await params;
   const body = await request.text();
-  return proxyToBackend(request, `/v2/defects/${encodeURIComponent(family_id)}/label`,
+  return proxyToBackend(request, `/v2/defects/${encodeURIComponent(id)}/label`,
     { method: "PATCH", body, contentType: "application/json" });
 }
 

frontend/src/lib/api/__tests__/route-parity.test.ts

@@ -60,4 +60,25 @@ describe("paridad endpoints.ts ↔ route handlers", () => {
     const missing = requiredPaths().filter((p) => !existing.has(p));
     expect(missing, `Faltan route handlers para: ${missing.join(", ")}`).toEqual([]);
   });
+
+  it("no hay slugs dinámicos hermanos con nombres distintos (crashea el runtime de Next)", () => {
+    // `next build` NO detecta esto; el runtime lanza "You cannot use different
+    // slug names for the same dynamic path" y TODA función serverless 504ea.
+    const appRoot = path.join(process.cwd(), "src/app");
+    const conflicts: string[] = [];
+
+    function walk(dir: string) {
+      const dirs = fs
+        .readdirSync(dir, { withFileTypes: true })
+        .filter((e) => e.isDirectory());
+      const slugs = dirs.map((e) => e.name).filter((n) => n.startsWith("[") && n.endsWith("]"));
+      if (new Set(slugs).size > 1) {
+        conflicts.push(`${path.relative(appRoot, dir) || "."} → ${slugs.join(", ")}`);
+      }
+      for (const e of dirs) walk(path.join(dir, e.name));
+    }
+
+    walk(appRoot);
+    expect(conflicts, `Slugs dinámicos en conflicto: ${conflicts.join(" | ")}`).toEqual([]);
+  });
 });