fix: vercel

Les11-AI-SDK/lesbestanden/polderfest-ai-finished/app/api/chat/route.ts

@@ -0,0 +1,17 @@
+import { streamText, convertToModelMessages } from "ai";
+import { openai } from "@ai-sdk/openai";
+import { createSupabaseServerClient } from "@/lib/supabase-server";
+
+export async function POST(req: Request) {
+  const { messages } = await req.json();
+  const supabase = await createSupabaseServerClient();
+  const { data: bands } = await supabase.from("bands").select("name, genre, country, stage, time");
+  const context = (bands ?? []).map((b) => `${b.name} (${b.genre}, ${b.country}) — ${b.stage} ${b.time}`).join("\n");
+
+  const result = streamText({
+    model: openai("gpt-4o-mini"),
+    system: `Je bent een hulpvaardige festival-roadie voor Polderfest 2027.\nLine-up:\n${context}`,
+    messages: convertToModelMessages(messages),
+  });
+  return result.toUIMessageStreamResponse();
+}