Add IOwnerMessage carrying numeric owner identity on messages

Introduce IOwnerMessage with OwnerUserId / OwnerPortfolioId — the numeric
primary keys of the owning user and portfolio. Implement it on OrderMessage,
ExecutionMessage, PositionChangeMessage and PortfolioMessage, copying both
fields in their CopyTo so the identity survives Clone. Order subtypes
(register/replace/cancel/group-cancel and order-status) inherit it from
OrderMessage, and PortfolioLookupMessage inherits it from PortfolioMessage.

This lets a downstream carry the owner identity on the message itself rather
than in an external instance-keyed side table that was lost on a clone.

Author: mikasoukhov

Messages/ExecutionMessage.cs

@@ -42,7 +42,7 @@ public enum ExecutionTypes
 public class ExecutionMessage : BaseSubscriptionIdMessage<ExecutionMessage>,
 	ITransactionIdMessage, IServerTimeMessage, ISecurityIdMessage, ISeqNumMessage,
 	IPortfolioNameMessage, IClientCodeMessage, IBrokerCodeMessage, IErrorMessage, IStrategyIdMessage, IGeneratedMessage,
-	IOrderMessage, ITickTradeMessage, IOrderLogMessage, ISystemMessage
+	IOrderMessage, ITickTradeMessage, IOrderLogMessage, ISystemMessage, IOwnerMessage
 {
 	OrderStates? IOrderMessage.State => OrderState;
 	decimal? IOrderMessage.Balance => Balance;
@@ -678,6 +678,12 @@ public override string ToString()
 		return str;
 	}
 
+	/// <inheritdoc />
+	public long OwnerUserId { get; set; }
+
+	/// <inheritdoc />
+	public long OwnerPortfolioId { get; set; }
+
 	/// <inheritdoc />
 	public override void CopyTo(ExecutionMessage destination)
 	{
@@ -748,5 +754,7 @@ public override void CopyTo(ExecutionMessage destination)
 		destination.OrderBuyId = OrderBuyId;
 		destination.OrderSellId = OrderSellId;
 		destination.MarketPrice = MarketPrice;
+		destination.OwnerUserId = OwnerUserId;
+		destination.OwnerPortfolioId = OwnerPortfolioId;
 	}
 }

Messages/IOwnerMessage.cs

@@ -0,0 +1,20 @@
+namespace StockSharp.Messages;
+
+/// <summary>
+/// The interface describing a message that carries the numeric identity of its owner —
+/// the owning user and portfolio primary keys. Carried on the message itself (and copied
+/// by <c>CopyTo</c>) so the identity survives cloning and travels with the message through
+/// the pipeline without an external side table.
+/// </summary>
+public interface IOwnerMessage
+{
+	/// <summary>
+	/// Numeric primary key of the owning user, or 0 when unknown.
+	/// </summary>
+	long OwnerUserId { get; set; }
+
+	/// <summary>
+	/// Numeric primary key of the owning portfolio, or 0 when unknown.
+	/// </summary>
+	long OwnerPortfolioId { get; set; }
+}

Messages/OrderMessage.cs

@@ -10,7 +10,7 @@ namespace StockSharp.Messages;
 [DataContract]
 [Serializable]
 public abstract class OrderMessage(MessageTypes type) : SecurityMessage(type),
-	ITransactionIdMessage, IPortfolioNameMessage, IClientCodeMessage, IBrokerCodeMessage, IStrategyIdMessage
+	ITransactionIdMessage, IPortfolioNameMessage, IClientCodeMessage, IBrokerCodeMessage, IStrategyIdMessage, IOwnerMessage
 {
 	/// <inheritdoc />
 	[DataMember]
@@ -109,6 +109,12 @@ public abstract class OrderMessage(MessageTypes type) : SecurityMessage(type),
 		GroupName = LocalizedStrings.GeneralKey)]
 	public MarginModes? MarginMode { get; set; }
 
+	/// <inheritdoc />
+	public long OwnerUserId { get; set; }
+
+	/// <inheritdoc />
+	public long OwnerPortfolioId { get; set; }
+
 	/// <summary>
 	/// Copy the message into the <paramref name="destination" />.
 	/// </summary>
@@ -127,6 +133,8 @@ public void CopyTo(OrderMessage destination)
 		destination.Condition = Condition?.Clone();
 		destination.Comment = Comment;
 		destination.MarginMode = MarginMode;
+		destination.OwnerUserId = OwnerUserId;
+		destination.OwnerPortfolioId = OwnerPortfolioId;
 	}
 
 	/// <inheritdoc />

Messages/PortfolioMessage.cs

@@ -27,7 +27,7 @@ public enum PortfolioStates
 /// </summary>
 [DataContract]
 [Serializable]
-public class PortfolioMessage : BaseSubscriptionIdMessage<PortfolioMessage>, IPortfolioNameMessage, IClientCodeMessage
+public class PortfolioMessage : BaseSubscriptionIdMessage<PortfolioMessage>, IPortfolioNameMessage, IClientCodeMessage, IOwnerMessage
 {
 	/// <inheritdoc />
 	[DataMember]
@@ -105,6 +105,12 @@ public override string ToString()
 		return str;
 	}
 
+	/// <inheritdoc />
+	public long OwnerUserId { get; set; }
+
+	/// <inheritdoc />
+	public long OwnerPortfolioId { get; set; }
+
 	/// <inheritdoc />
 	public override void CopyTo(PortfolioMessage destination)
 	{
@@ -114,5 +120,7 @@ public override void CopyTo(PortfolioMessage destination)
 		destination.Currency = Currency;
 		destination.BoardCode = BoardCode;
 		destination.ClientCode = ClientCode;
+		destination.OwnerUserId = OwnerUserId;
+		destination.OwnerPortfolioId = OwnerPortfolioId;
 	}
 }

Messages/PositionChangeMessage.cs

@@ -209,7 +209,7 @@ public enum PositionChangeTypes
 	Name = LocalizedStrings.PositionKey,
 	Description = LocalizedStrings.PositionDescKey)]
 public class PositionChangeMessage : BaseChangeMessage<PositionChangeMessage,
-	PositionChangeTypes>, IPortfolioNameMessage, IClientCodeMessage, ISecurityIdMessage, IStrategyIdMessage
+	PositionChangeTypes>, IPortfolioNameMessage, IClientCodeMessage, ISecurityIdMessage, IStrategyIdMessage, IOwnerMessage
 {
 	/// <inheritdoc />
 	[DataMember]
@@ -326,6 +326,12 @@ public override Message Clone()
 		return clone;
 	}
 
+	/// <inheritdoc />
+	public long OwnerUserId { get; set; }
+
+	/// <inheritdoc />
+	public long OwnerPortfolioId { get; set; }
+
 	/// <inheritdoc />
 	public override void CopyTo(PositionChangeMessage destination)
 	{
@@ -340,6 +346,8 @@ public override void CopyTo(PositionChangeMessage destination)
 		destination.BoardCode = BoardCode;
 		destination.StrategyId = StrategyId;
 		destination.Side = Side;
+		destination.OwnerUserId = OwnerUserId;
+		destination.OwnerPortfolioId = OwnerPortfolioId;
 	}
 
 	/// <inheritdoc />