feat: enhance CSV import functionality, integrate react-query for data fetching, and refactor admin components

backend/server.js

@@ -40,8 +40,8 @@ app.get("/table-data", authenticate, async (req, res) => {
 });
 
 app.post("/create-entry", async (req, res) => {
-  const result = await createEntry(req.body);
-  if (result.success) {
+  const result = await createEntry(req.body.losnummer);
+  if (result) {
     res.status(201).json({ success: true });
   } else {
     res.status(400).json({ success: false });