{
  "$schema": "urn:prism:schema:v1:spec",
  "title": "Score over time",
  "data": {
    "name": "score_history",
    "values": [
      {"day": "2026-01-01", "score": 0.42},
      {"day": "2026-01-02", "score": 0.55},
      {"day": "2026-01-03", "score": 0.61}
    ]
  },
  "mark": "line",
  "encoding": {
    "x": {"field": "day",   "type": "temporal"},
    "y": {"field": "score", "type": "quantitative"}
  }
}