Add ability to edit participant name and phone number

server/database.ts

@@ -339,6 +339,10 @@ export const participantOps = {
     db.prepare('DELETE FROM participants WHERE id = ?').run(id);
   },
   
+  update: (id: number, name: string, phone: string | null): void => {
+    db.prepare('UPDATE participants SET name = ?, phone = ? WHERE id = ?').run(name, phone, id);
+  },
+  
   isTokenAvailable: (token: string): boolean => {
     const result = db.prepare('SELECT id FROM participants WHERE token = ?').get(token);
     return !result;

server/routes/admin.ts

@@ -225,6 +225,30 @@ router.post('/questionnaires/:id/participants', (req: Request, res: Response) =>
   res.json({ success: true, participant });
 });
 
+// Update participant
+router.put('/participants/:id', (req: Request, res: Response) => {
+  const { name, phone } = req.body;
+  const participant = participantOps.findById(parseInt(req.params.id));
+  
+  if (!participant) {
+    res.status(404).json({ error: 'Deelnemer niet gevonden' });
+    return;
+  }
+  
+  if (!name?.trim()) {
+    res.status(400).json({ error: 'Naam is verplicht' });
+    return;
+  }
+  
+  // Clean phone number (remove spaces, keep + and digits) or set to null if empty
+  const cleanPhone = phone?.trim() ? phone.trim().replace(/[^\d+]/g, '') : null;
+  
+  participantOps.update(participant.id, name.trim(), cleanPhone);
+  const updated = participantOps.findById(participant.id);
+  
+  res.json({ success: true, participant: updated });
+});
+
 // Delete participant
 router.delete('/participants/:id', (req: Request, res: Response) => {
   participantOps.delete(parseInt(req.params.id));