{
  "$id": "https://targetspace.ai/platform/schemas/evidence-stream.schema.json",
  "title": "EvidenceStream",
  "type": "object",
  "required": [
    "stream_id",
    "tier",
    "modality"
  ],
  "properties": {
    "stream_id": {
      "type": "string",
      "pattern": "^[A-Za-z0-9._-]{3,64}$"
    },
    "tier": {
      "enum": [
        "L0",
        "L1",
        "L2",
        "L3",
        "L4",
        "L5",
        "L6"
      ]
    },
    "modality": {
      "type": "string",
      "description": "e.g. calendar-metadata, task-events, message-metadata, app-focus, sensor-telemetry"
    },
    "sampling": {
      "type": "string"
    },
    "cost": {
      "$ref": "evidence-cost"
    }
  }
}