implemented instance lists and pot, todos still missing

server/api/updateProductionOrderInstance.ts

@@ -0,0 +1,14 @@
+import { errorMsg } from "../middleware/productionOrders";
+
+export default defineEventHandler(async (event) => {
+
+    if (!(errorMsg === '')) {
+        throw createError({
+            statusCode: 400,
+            statusMessage: errorMsg,
+        })
+    }
+
+    setResponseStatus(event, 200)
+    return errorMsg
+})