[
  {
    "id": "m1",
    "firstName": "Max",
    "lastName": "Mustermann",
    "email": "max@example.com",
    "phone": "069 123456",
    "address": "Musterstraße 1, 60437 Frankfurt",
    "notes": "Herren 1"
  },
  {
    "id": "m2",
    "firstName": "Anna",
    "lastName": "Schmidt",
    "email": "",
    "phone": "069 234567",
    "address": "Hauptstraße 5, 60437 Frankfurt",
    "notes": "Damen"
  }
]