[
 {
  "type": "elevation",
  "time": "2026-09-21T19:47:00+02:00",
  "value": -4.5,
  "tol": 2.0,
  "note": "whiteboard 19:47:23 'MØRKT NÅ' (dark now under canopy); stream ~22 s delayed"
 },
 {
  "type": "elevation",
  "time": "2026-09-21T19:00:40+02:00",
  "value": 1,
  "tol": 2.5,
  "note": "whiteboard 19:01 'sola går ned snart' (sunset soon)"
 },
 {
  "type": "elevation",
  "time": "2026-09-21T19:57:00+02:00",
  "value": -6,
  "tol": 2.0,
  "note": "camera: twilight sky glow between the trees reached its floor (sky_glow.py, IR mode)"
 }
]