Generate a portfolio performance and risk insight report based on the dataset.

Analyze and explain:
1. Overall portfolio performance, including total invested amount, current value, and overall unrealized P&L
2. Performance comparison across major asset classes
3. Which asset classes contribute most to gains and losses
4. Differences in performance across client tiers and risk profiles
5. Key risk signals, such as concentrated losses or underperforming asset classes

Include:
- Clear summary tables or charts where helpful
- Short written insights explaining the key findings
- A concise conclusion highlighting major opportunities and risks

The report should be suitable for asset managers or investment decision-makers.