[
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  {"id":"demo-2","date":"2026-09-05","merchant":"Internet","amount":29.9,"account":"Demo-Konto","category":"Internet","cost_type":"fix","necessity":"notwendig","source":"Demo","note":"","month":"2026-09","split":null,"trip":null},
  {"id":"demo-3","date":"2026-09-07","merchant":"Café","amount":18.5,"account":"Demo-Karte","category":"Gastronomie & Ausgehen","cost_type":"variabel","necessity":"freiwillig","source":"Demo","note":"","month":"2026-09","split":null,"trip":null}
]