add a settings page and can add edit instruments in setting web page

app.py

@@ -5,9 +5,53 @@ import concurrent.futures
 from flask_caching import Cache
 import csv, os, logging
 from concurrent.futures import ThreadPoolExecutor
+import pandas as pd
+
 
 app = Flask(__name__)
 cache = Cache(app, config={'CACHE_TYPE': 'SimpleCache'})
+# The CSV is in the root directory (same level as app.py)
+CSV_PATH = os.path.join(os.path.dirname(__file__), 'instruments.csv')
+
+@app.route('/settings')
+def settings():
+    instruments = []
+    last_updated = "Never"
+    
+    if os.path.exists(CSV_PATH):
+        # 1. Get the last modified time from the Synology filesystem
+        mtime = os.path.getmtime(CSV_PATH)
+        last_updated = datetime.fromtimestamp(mtime).strftime('%Y-%m-%d %H:%M:%S')
+        
+        # 2. Read the data
+        df = pd.read_csv(CSV_PATH)
+        df = df.fillna('')
+        instruments = df.to_dict(orient='records')
+    
+    return render_template('settings.html', instruments=instruments, last_updated=last_updated)
+
+@app.route('/settings/save', methods=['POST'])
+def save_settings():
+    try:
+        names = request.form.getlist('name[]')
+        cusips = request.form.getlist('cusip[]')
+        providers = request.form.getlist('provider[]')
+        
+        # Create a new DataFrame from the web form data
+        new_data = {
+            'name': [s.strip() for s in names if s.strip()],
+            'cusip': [u.strip() for u in cusips if u.strip()],
+            'provider': [p.strip() for p in providers if p.strip()]
+        }
+        
+        df = pd.DataFrame(new_data)
+        # Save directly back to the root folder
+        df.to_csv(CSV_PATH, index=False)
+        
+        return redirect('/settings')
+    except Exception as e:
+        print(f"Error saving CSV: {e}")
+        return "Internal Server Error", 500
 
 @cache.memoize(timeout=3600)
 def fetch_and_calculate(config):