removed unecessary imports

app.py

@@ -22,11 +22,10 @@ import pickle
 import requests
 from datetime import datetime, timedelta
 import re
-import redis
 from flask_session import Session
 
 app = Flask(__name__)
-# Use filesystem session instead of Redis
+# Configure filesystem session storage
 app.config['SESSION_TYPE'] = 'filesystem'
 app.config['PERMANENT_SESSION_LIFETIME'] = timedelta(minutes=30)
 app.secret_key = os.getenv('FLASK_SECRET_KEY') or os.urandom(24)

requirements.txt

@@ -1,6 +1,7 @@
 # filepath: c:\Users\Phyllis\PatentExplorerApp\requirements.txt
 flask==2.0.3
 Werkzeug==2.0.3
+flask-session==0.5.0
 python-dotenv==0.19.0
 requests==2.26.0
 openai==0.28.1