Implement Portfolio Service - CRUD Operations

[grantfox-oss]

Description:
Implement portfolio service with create, read, update, delete operations. Include validation for portfolio properties and business logic for portfolio management.

Acceptance Criteria:

• Create portfolio with name, type, initial allocation
• Read portfolio details, holdings, performance metrics
• Update portfolio properties and allocation strategy
• Delete/archive portfolio (soft delete)
• List portfolios with pagination and filtering
• Validate portfolio name (unique, 3-100 chars)
• Track portfolio creation and modification timestamps
• Support multiple portfolio types (balanced, aggressive, conservative)

Definition of Done:

• PortfolioService with all CRUD methods
• Service includes business logic for validation
• Logging integrated for all operations
• Unit tests > 90% coverage

Test Requirements:

• Unit tests for each operation
• Edge case tests (duplicate names, invalid data)
• Performance test for large portfolios

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[Noubata]

Hi,I'd would like to help with this. I have experience with Database, test Unit and many more. I can submit a PR within 2 days.

[Divineifed1]

kindly assign me this task so i can implement it effectively and efficiently

[grantfox-oss]

🦊 GrantFox — @Divineifed1 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #29)
2. Your PR will be reviewed by the SourceXXL maintainers

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