{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://boat.local/quant60/schemas/broker_snapshot.schema.json",
  "title": "Quant60 broker snapshot",
  "description": "A point-in-time broker fact used for pre-trade and reconciliation.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema_version",
    "snapshot_id",
    "signal_as_of",
    "next_trading_session",
    "first_executable_window",
    "observation_as_of",
    "as_of",
    "source_time",
    "broker",
    "account_hash",
    "cash",
    "total_asset",
    "positions",
    "open_orders"
  ],
  "properties": {
    "schema_version": {
      "const": "1.0"
    },
    "snapshot_id": {
      "type": "string",
      "minLength": 1
    },
    "as_of": {
      "type": "string",
      "format": "date-time",
      "description": "Broker observation completion time. This may be later than the signal close when the snapshot is queried on the next executable session."
    },
    "observation_as_of": {
      "type": "string",
      "format": "date-time",
      "description": "Explicit observation-clock alias for as_of. Account-bound decision paths require the two instants to be equal."
    },
    "signal_as_of": {
      "type": "string",
      "format": "date-time",
      "description": "Required completed signal-close clock this snapshot is intended to bind."
    },
    "next_trading_session": {
      "type": "string",
      "format": "date",
      "description": "The unique adjacent trading session from the verified decision calendar."
    },
    "first_executable_window": {
      "$ref": "#/$defs/first_executable_window"
    },
    "broker": {
      "type": "string",
      "minLength": 1
    },
    "account_hash": {
      "type": "string",
      "minLength": 8,
      "description": "One-way account identifier; never store the raw account number."
    },
    "cash": {
      "type": "number",
      "minimum": 0
    },
    "total_asset": {
      "type": "number",
      "minimum": 0
    },
    "market_value": {
      "type": "number",
      "minimum": 0
    },
    "positions": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/position"
      }
    },
    "open_orders": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/open_order"
      }
    },
    "source_time": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp assigned to the broker facts; it must not predate the bound signal and must remain fresh relative to the observation clock."
    },
    "metadata": {
      "type": "object"
    }
  },
  "$defs": {
    "first_executable_window": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "session",
        "timezone",
        "start",
        "end",
        "boundary",
        "purpose"
      ],
      "properties": {
        "session": {
          "type": "string",
          "format": "date"
        },
        "timezone": {
          "const": "Asia/Shanghai"
        },
        "start": {
          "type": "string",
          "format": "date-time"
        },
        "end": {
          "type": "string",
          "format": "date-time"
        },
        "boundary": {
          "const": "[start,end)"
        },
        "purpose": {
          "const": "PRE_OPEN_BROKER_OBSERVATION"
        }
      }
    },
    "canonical_symbol": {
      "type": "string",
      "pattern": "^[0-9]{6}\\.(XSHG|XSHE|XBSE)$"
    },
    "position": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "symbol",
        "quantity",
        "sellable_quantity"
      ],
      "properties": {
        "symbol": {
          "$ref": "#/$defs/canonical_symbol"
        },
        "quantity": {
          "type": "integer",
          "minimum": 0
        },
        "sellable_quantity": {
          "type": "integer",
          "minimum": 0
        },
        "average_cost": {
          "type": [
            "number",
            "null"
          ],
          "minimum": 0
        },
        "market_value": {
          "type": [
            "number",
            "null"
          ],
          "minimum": 0
        }
      }
    },
    "open_order": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "order_id",
        "broker_order_id",
        "symbol",
        "side",
        "quantity",
        "filled_quantity",
        "status",
        "limit_price",
        "order_type",
        "time_in_force"
      ],
      "properties": {
        "order_id": {
          "type": "string",
          "minLength": 1
        },
        "broker_order_id": {
          "type": "string",
          "minLength": 1
        },
        "symbol": {
          "$ref": "#/$defs/canonical_symbol"
        },
        "side": {
          "enum": [
            "BUY",
            "SELL"
          ]
        },
        "quantity": {
          "type": "integer",
          "minimum": 1
        },
        "filled_quantity": {
          "type": "integer",
          "minimum": 0
        },
        "status": {
          "enum": [
            "NEW",
            "ACCEPTED",
            "PARTIALLY_FILLED",
            "CANCEL_PENDING",
            "UNKNOWN"
          ]
        },
        "limit_price": {
          "type": "number",
          "exclusiveMinimum": 0
        },
        "order_type": {
          "const": "LIMIT"
        },
        "time_in_force": {
          "const": "DAY"
        }
      }
    }
  }
}