06/01 Optimize porfolio page

app/routes/investments.py

@@ -6,7 +6,8 @@ from wtforms.validators import DataRequired, Optional, NumberRange, Length
 from app.extensions import db
 from app.models.investment import Investment, InvestmentTransaction
 from app.services.investment_service import (
-    get_portfolio_summary, update_prices, fetch_price, fetch_price_history,
+    get_portfolio_summary, update_prices, fetch_price,
+    fetch_price_history, fetch_day_change,
     ASSET_COLORS, ASSET_TYPE_LABELS
 )
 from datetime import date
@@ -275,6 +276,19 @@ def api_price(ticker):
     })
 
 
+@investments_bp.route('/api/daychange/<ticker>')
+@login_required
+def api_day_change(ticker):
+    """
+    Lightweight endpoint: return today's open-to-current day change only.
+    Used by the portfolio page to load change badges quickly.
+    """
+    data = fetch_day_change(ticker.upper().strip())
+    if data is None:
+        return jsonify({'error': f'No data for {ticker}'}), 404
+    return jsonify(data)
+
+
 @investments_bp.route('/api/history/<ticker>')
 @login_required
 def api_price_history(ticker):