{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "contract/ingest/telemetry.schema.json",
  "type": "object",
  "required": ["m", "s", "u", "v"],
  "additionalProperties": false,
  "properties": {
    "m": {
      "type": "string",
      "minLength": 1,
      "description": "Metric type (e.g. t=temperature, h=humidity)"
    },
    "s": {
      "type": "string",
      "minLength": 1,
      "description": "Source identifier (sensor/channel)"
    },
    "u": {
      "type": "string",
      "minLength": 1,
      "description": "Unit (e.g. c, pct, v)"
    },
    "v": {
      "type": "array",
      "minItems": 1,
      "items": {
        "type": "array",
        "minItems": 2,
        "maxItems": 2,
        "items": [
          {
            "type": "integer",
            "minimum": 0,
            "description": "Delta time (seconds) from base ts"
          },
          {
            "type": "number",
            "description": "Measured value"
          }
        ]
      }
    }
  }
}