Add debugging for date format issue

- Added logging to see actual date values being generated
- Refactored to reuse first_buy_order for consistency
- Investigating why dates might appear truncated

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -402,7 +402,9 @@ def refresh_investment_performance_table():
                 ipo_price = ipo_price_lookup.get(symbol, 0)
                 
                 # Get first buy date
-                first_buy_date = min(buy_orders, key=lambda x: x.filled_at).filled_at.strftime('%Y-%m-%d')
+                first_buy_order = min(buy_orders, key=lambda x: x.filled_at)
+                first_buy_date = first_buy_order.filled_at.strftime('%Y-%m-%d')
+                logger.info(f"Date for {symbol}: {first_buy_date} (from {first_buy_order.filled_at})")
                 
                 # Calculate sell price (average of all sells)
                 if sell_orders:
@@ -464,7 +466,7 @@ def refresh_investment_performance_table():
                     'P&L (%)': pl_percent_str,
                     'Date': first_buy_date,
                     '_row_bg': row_bg,  # Store background color for styling
-                    '_sort_date': min(buy_orders, key=lambda x: x.filled_at).filled_at  # Store datetime for sorting
+                    '_sort_date': first_buy_order.filled_at  # Store datetime for sorting
                 })
     
     # Sort by date (most recent first)