Update app.py

app.py

@@ -19,8 +19,17 @@ app = Flask(__name__)
 app.secret_key = os.environ.get("SESSION_SECRET", "dev-secret-key")
 app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1, x_host=1)
 
+# Session configuration for better security and reliability
+app.config['SESSION_COOKIE_SECURE'] = True
+app.config['SESSION_COOKIE_HTTPONLY'] = True
+app.config['SESSION_COOKIE_SAMESITE'] = 'Lax'
+app.config['PERMANENT_SESSION_LIFETIME'] = 86400  # 24 hours
+
 # Configure database
-app.config["SQLALCHEMY_DATABASE_URI"] = os.environ.get("DATABASE_URL", "sqlite:///whatsapp_clone.db")
+db_url = os.environ.get("DATABASE_URL")
+if db_url and db_url.startswith("postgres://"):
+    db_url = db_url.replace("postgres://", "postgresql://", 1)
+app.config["SQLALCHEMY_DATABASE_URI"] = db_url or "sqlite:///whatsapp_clone.db"
 app.config["SQLALCHEMY_ENGINE_OPTIONS"] = {
     "pool_recycle": 300,
     "pool_pre_ping": True,