Strategy with multiple versions causes exception during save

Description

Saving a strategy that has more than 1 version is causing an exception during the save operation.

Steps to Reproduce

1. Create a strategy
2. Create a second version of the strategy
3. Attempt to save the strategy
4. Exception occurs

Expected Behavior

Strategy with multiple versions should save successfully without throwing exceptions.

Actual Behavior

Exception is thrown during save operation (specific exception details to be added when reproduced).

Environment

• .NET 9
• Entity Framework Core
• Clean Architecture with CQRS pattern

Additional Context

This issue emerged after recent refactoring of Strategy entity navigation properties from private fields to proper EF navigation properties. The issue might be related to:

• EF Core change tracking of navigation properties
• Strategy version management logic
• Entity configuration for multiple versions

Priority

High - Blocks strategy versioning functionality

Labels

• bug
• entity-framework
• strategy-management