{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://boat.local/quant60/schemas/signal.schema.json",
  "title": "Quant60 signal record",
  "description": "A point-in-time model output. It is not a target position or an order.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema_version",
    "run_id",
    "signal_id",
    "as_of",
    "symbol",
    "horizon_trading_days",
    "score",
    "model_version",
    "data_version"
  ],
  "properties": {
    "schema_version": {
      "const": "1.0"
    },
    "run_id": {
      "type": "string",
      "minLength": 1
    },
    "signal_id": {
      "type": "string",
      "minLength": 1
    },
    "as_of": {
      "type": "string",
      "format": "date-time"
    },
    "symbol": {
      "$ref": "#/$defs/canonical_symbol"
    },
    "horizon_trading_days": {
      "type": "integer",
      "minimum": 1
    },
    "score": {
      "type": "number"
    },
    "expected_excess_return": {
      "type": [
        "number",
        "null"
      ]
    },
    "confidence": {
      "type": [
        "number",
        "null"
      ],
      "minimum": 0,
      "maximum": 1
    },
    "model_version": {
      "type": "string",
      "minLength": 1
    },
    "data_version": {
      "type": "string",
      "minLength": 1
    },
    "feature_version": {
      "type": [
        "string",
        "null"
      ]
    },
    "metadata": {
      "type": "object"
    }
  },
  "$defs": {
    "canonical_symbol": {
      "type": "string",
      "pattern": "^[0-9]{6}\\.(XSHG|XSHE|XBSE)$",
      "examples": [
        "600000.XSHG",
        "000001.XSHE",
        "830799.XBSE"
      ]
    }
  }
}