[
  {
    "code": "DUPLICATE_ID",
    "path": "/plan/phases/0/weeks/0/days/0/blocks/0/activities/1",
    "severity": "error",
    "meta": {
      "duplicate_id": "act_1",
      "scope": "phase:phase_1/week:week_1/day:day_1",
      "first_occurrence": "/plan/phases/0/weeks/0/days/0/blocks/0/activities/0"
    }
  }
]