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- Replace deprecated `date` parameter with `start_date`/`end_date` - Return single-date format (detailed) when dates are equal - Return range format (lightweight with period metrics) when dates differ - Add period metrics: period_return_pct, annualized_return_pct, calendar_days, trading_days - Default to last 30 days when no dates provided - Group results by model for date range queries - Add comprehensive test coverage for both response formats - Implement automatic edge trimming for date ranges - Add 404 error handling for empty result sets - Include 422 error for deprecated `date` parameter usage