feat: add market order support (estimated price + reconciliation)

- Add MARKET to OrderType enum
- Add estimated_price property to Order model (stored in metadata)
- Add create_market_order(), create_market_buy_order(), create_market_sell_order() to Context and TradingStrategy
- Add validate_market_order() to OrderService
- Market orders fill at Open price of next candle in backtesting
- Apply slippage via TradingCost when configured
- Reconcile portfolio delta between estimated and actual fill price
- Add CCXT market order execution (createMarketBuyOrder/createMarketSellOrder)
- Add 14 tests covering enum, model, creation, fill, slippage, reconciliation, validation
- Update orders.md and strategies.md documentation

Closes #430

Author: MDUYN

docusaurus/docs/Getting Started/orders.md

@@ -357,6 +357,28 @@ order = self.create_limit_order(
     sync=True
 )
 
+# Create a market order (fills at best available price)
+order = self.create_market_order(
+    target_symbol="BTC",
+    order_side=OrderSide.BUY,
+    amount=0.01,                    # Amount in target symbol
+    # OR
+    amount_trading_symbol=500,      # Amount in trading symbol (EUR)
+    # OR
+    percentage_of_portfolio=10,     # 10% of portfolio
+)
+
+# Convenience methods for market orders
+self.create_market_buy_order(
+    target_symbol="BTC",
+    percentage_of_portfolio=10,     # Buy 10% of portfolio
+)
+
+self.create_market_sell_order(
+    target_symbol="BTC",
+    percentage_of_position=50,      # Sell 50% of position
+)
+
 # Close a position entirely
 self.close_position(symbol="BTC")
 ```

docusaurus/docs/Getting Started/strategies.md

@@ -270,6 +270,225 @@ def create_limit_order(
             order_data, execute=execute, validate=validate, sync=sync
         )
 
+    def create_market_order(
+        self,
+        target_symbol,
+        order_side,
+        amount=None,
+        amount_trading_symbol=None,
+        percentage=None,
+        percentage_of_portfolio=None,
+        percentage_of_position=None,
+        precision=None,
+        market=None,
+        execute=True,
+        validate=True,
+        sync=True,
+        metadata=None
+    ) -> Order:
+        """
+        Function to create a market order. Market orders execute at
+        the best available price. In backtesting, this means the
+        open price of the next candle (+ slippage).
+
+        An estimated price (current latest price) is used for amount
+        calculation and cash reservation. The actual fill price is
+        determined at fill time and the portfolio is reconciled.
+
+        Args:
+            target_symbol: The symbol of the asset to trade
+            order_side: The side of the order (BUY or SELL)
+            amount (optional): The amount of the asset to trade
+            amount_trading_symbol (optional): The amount of the
+              trading symbol to trade
+            percentage (optional): The percentage of the portfolio
+              to allocate to the order
+            percentage_of_portfolio (optional): The percentage
+              of the portfolio to allocate to the order
+            percentage_of_position (optional): The percentage
+              of the position to allocate to the
+                order. (Only supported for SELL orders)
+            precision (optional): The precision of the amount
+            market (optional): The market to trade the asset
+            execute (optional): Default True. If set to True,
+              the order will be executed
+            validate (optional): Default True. If set to
+              True, the order will be validated
+            sync (optional): Default True. If set to True,
+              the created order will be synced with the
+                portfolio of the algorithm
+            metadata (optional): Additional metadata for the order
+
+        Returns:
+            Order: Instance of the order created
+        """
+        portfolio = self.portfolio_service.find({"market": market})
+        full_symbol = (f"{target_symbol}/{portfolio.trading_symbol}")
+        estimated_price = self.get_latest_price(full_symbol, market=market)
+
+        if estimated_price is None:
+            raise OperationalException(
+                f"Cannot create market order for {target_symbol}: "
+                f"no price data available to estimate order size."
+            )
+
+        if percentage_of_portfolio is not None:
+            if not OrderSide.BUY.equals(order_side):
+                raise OperationalException(
+                    "Percentage of portfolio is only supported for BUY orders."
+                )
+
+            net_size = portfolio.get_net_size()
+            size = net_size * (percentage_of_portfolio / 100)
+            amount = size / estimated_price
+
+        elif percentage_of_position is not None:
+
+            if not OrderSide.SELL.equals(order_side):
+                raise OperationalException(
+                    "Percentage of position is only supported for SELL orders."
+                )
+
+            position = self.position_service.find(
+                {
+                    "symbol": target_symbol,
+                    "portfolio": portfolio.id
+                }
+            )
+            amount = position.get_amount() * (percentage_of_position / 100)
+
+        elif percentage is not None:
+            net_size = portfolio.get_net_size()
+            size = net_size * (percentage / 100)
+            amount = size / estimated_price
+
+        if precision is not None:
+            amount = RoundingService.round_down(amount, precision)
+
+        if amount_trading_symbol is not None:
+            amount = amount_trading_symbol / estimated_price
+
+        if amount is None:
+            raise OperationalException(
+                "The amount parameter is required to create a market order. "
+                "Either the amount, amount_trading_symbol, percentage, "
+                "percentage_of_portfolio or percentage_of_position "
+                "parameter must be specified."
+            )
+
+        logger.info(
+            f"Creating market order: {target_symbol} "
+            f"{order_side} {amount} @ estimated {estimated_price}"
+        )
+
+        order_metadata = metadata if metadata is not None else {}
+        order_metadata["estimated_price"] = estimated_price
+
+        order_data = {
+            "target_symbol": target_symbol,
+            "price": estimated_price,
+            "amount": amount,
+            "order_type": OrderType.MARKET.value,
+            "order_side": OrderSide.from_value(order_side).value,
+            "portfolio_id": portfolio.id,
+            "status": OrderStatus.CREATED.value,
+            "trading_symbol": portfolio.trading_symbol,
+            "metadata": order_metadata,
+        }
+
+        if BACKTESTING_FLAG in self.configuration_service.config \
+                and self.configuration_service.config[BACKTESTING_FLAG]:
+            order_data["created_at"] = \
+                self.configuration_service.config[INDEX_DATETIME]
+
+        return self.order_service.create(
+            order_data, execute=execute, validate=validate, sync=sync
+        )
+
+    def create_market_buy_order(
+        self,
+        target_symbol,
+        amount=None,
+        percentage_of_portfolio=None,
+        market=None,
+        portfolio_id=None,
+        metadata=None
+    ) -> Order:
+        """
+        Function to create a market buy order.
+
+        Args:
+            target_symbol (str): The symbol of the asset to buy
+            amount (float, optional): The amount of the asset to buy
+            percentage_of_portfolio (float, optional): The percentage of the
+                portfolio to buy.
+            market (str, optional): the portfolio corresponding to the market
+                to buy the asset
+            portfolio_id (str, optional): The ID of the portfolio to buy
+                the asset from.
+            metadata (dict, optional): Additional metadata for the order
+
+        Returns:
+            Order: The order created
+        """
+
+        if amount is None and percentage_of_portfolio is None:
+            raise OperationalException(
+                "Either amount or percentage_of_portfolio must be specified "
+                "to create a market buy order."
+            )
+
+        return self.create_market_order(
+            target_symbol=target_symbol,
+            order_side=OrderSide.BUY,
+            amount=amount,
+            percentage_of_portfolio=percentage_of_portfolio,
+            market=market,
+            metadata=metadata
+        )
+
+    def create_market_sell_order(
+        self,
+        target_symbol,
+        amount=None,
+        percentage_of_position=None,
+        market=None,
+        portfolio_id=None,
+        metadata=None
+    ) -> Order:
+        """
+        Function to create a market sell order.
+
+        Args:
+            target_symbol (str): The symbol of the asset to sell
+            amount (float, optional): The amount of the asset to sell
+            percentage_of_position (float, optional): The percentage of the
+                position to sell.
+            market (str, optional): the portfolio corresponding to the market
+                to sell the asset
+            portfolio_id (str, optional): The ID of the portfolio to sell
+                the asset from.
+            metadata (dict, optional): Additional metadata for the order
+
+        Returns:
+            Order: The order created
+        """
+
+        if amount is None and percentage_of_position is None:
+            raise OperationalException(
+                "Either amount or percentage_of_position must be specified "
+                "to create a market sell order."
+            )
+
+        return self.create_market_order(
+            target_symbol=target_symbol,
+            order_side=OrderSide.SELL,
+            amount=amount,
+            percentage_of_position=percentage_of_position,
+            market=market,
+            metadata=metadata
+        )
+
     def create_limit_sell_order(
         self,
         target_symbol,

investing_algorithm_framework/app/context.py

@@ -989,6 +989,69 @@ def create_limit_order(
             metadata=metadata
         )
 
+    def create_market_order(
+        self,
+        target_symbol,
+        order_side,
+        amount=None,
+        amount_trading_symbol=None,
+        percentage=None,
+        percentage_of_portfolio=None,
+        percentage_of_position=None,
+        precision=None,
+        market=None,
+        execute=True,
+        validate=True,
+        sync=True,
+        metadata=None
+    ) -> Order:
+        """
+        Function to create a market order. Market orders execute at
+        the best available price. In backtesting, this means the
+        open price of the next candle (+ slippage).
+
+        Args:
+            target_symbol: The symbol of the asset to trade
+            order_side: The side of the order (BUY or SELL)
+            amount (optional): The amount of the asset to trade
+            amount_trading_symbol (optional): The amount of the trading
+              symbol to trade
+            percentage (optional): The percentage of the portfolio to
+                allocate to the order
+            percentage_of_portfolio (optional): The percentage of
+              the portfolio to allocate to the order
+            percentage_of_position (optional): The percentage of
+              the position to allocate to the order.
+              (Only supported for SELL orders)
+            precision (optional): The precision of the amount
+            market (optional): The market to trade the asset
+            execute (optional): Default True. If set to True, the order
+              will be executed
+            validate (optional): Default True. If set to True, the order
+              will be validated
+            sync (optional): Default True. If set to True, the created
+              order will be synced with the portfolio of the context
+            metadata (optional): Additional metadata for the order
+
+        Returns:
+            Order: Instance of the order created
+        """
+        return self.context.create_market_order(
+            target_symbol=target_symbol,
+            order_side=order_side,
+            amount=amount,
+            amount_trading_symbol=amount_trading_symbol,
+            percentage=percentage,
+            percentage_of_portfolio=percentage_of_portfolio,
+            percentage_of_position=percentage_of_position,
+            precision=precision,
+            market=market,
+            execute=execute,
+            validate=validate,
+            sync=sync,
+            metadata=metadata
+        )
+
     def close_position(
         self, symbol, market=None, identifier=None, precision=None
     ) -> Order:

investing_algorithm_framework/app/strategy.py

@@ -377,12 +377,28 @@ def __repr__(self):
             updated_at=self.get_updated_at(),
         )
 
+    @property
+    def estimated_price(self):
+        """Get the estimated price stored in metadata (used for market
+        orders to track the price estimate at creation time)."""
+        return self.metadata.get("estimated_price")
+
+    @estimated_price.setter
+    def estimated_price(self, value):
+        self.metadata["estimated_price"] = value
+
     def get_size(self):
         """
-        Get the size of the order
+        Get the size of the order. For market orders with an estimated
+        price, uses the estimated price for size calculation.
 
         Returns:
             float: The size of the order
         """
-        return self.get_amount() * self.get_price() \
-            if self.get_price() is not None else 0
+        price = self.get_price()
+
+        if price is None or price == 0:
+            # Fall back to estimated_price for market orders
+            price = self.estimated_price
+
+        return self.get_amount() * price if price is not None else 0

investing_algorithm_framework/domain/models/order/order.py

@@ -3,6 +3,7 @@
 
 class OrderType(Enum):
     LIMIT = 'LIMIT'
+    MARKET = 'MARKET'
 
     @staticmethod
     def from_string(value: str):

investing_algorithm_framework/domain/models/order/order_type.py

@@ -65,6 +65,29 @@ def execute_order(self, portfolio, order, market_credential) -> Order:
                     external_order = exchange.createLimitSellOrder(
                         symbol, amount, price,
                     )
+            elif OrderType.MARKET.equals(order_type):
+                if OrderSide.BUY.equals(order_side):
+
+                    if not hasattr(exchange, "createMarketBuyOrder"):
+                        raise OperationalException(
+                            f"Exchange {market} does not support "
+                            f"functionality createMarketBuyOrder"
+                        )
+
+                    external_order = exchange.createMarketBuyOrder(
+                        symbol, amount,
+                    )
+                else:
+
+                    if not hasattr(exchange, "createMarketSellOrder"):
+                        raise OperationalException(
+                            f"Exchange {market} does not support "
+                            f"functionality createMarketSellOrder"
+                        )
+
+                    external_order = exchange.createMarketSellOrder(
+                        symbol, amount,
+                    )
             else:
                 raise OperationalException(
                     f"Order type {order_type} not supported "