Retrieve comprehensive analytics for a specific buyer, designed for portfolio visualization and trend analysis.
Returns:
The buyer_name is matched case-insensitively. Returns 404 if no data found.
Note: Pricing data is not available — all metrics are quantity-based.
Buyer analytics with summary, vintage breakdown, category portfolio, and time series
Comprehensive analytics for a carbon credit buyer
Summary metrics: total_retirements, avg_vintage, total_transactions
Retirements grouped by vintage year, sorted by vintage
Portfolio breakdown with keys: current_year, previous_year
Monthly retirements time series, sorted chronologically