healthcheck fix

app/routes.py

@@ -1,6 +1,7 @@
 from flask import Blueprint, render_template, redirect, url_for, flash, request, jsonify, send_from_directory, current_app
 from urllib.parse import urlparse
 from flask_login import login_user, logout_user, login_required, current_user
+from sqlalchemy import text
 from app import db
 from app.models import User, Subscription, UserSettings, PaymentMethod, ExchangeRate, Webhook
 from app.forms import (LoginForm, SubscriptionForm, UserSettingsForm, 
@@ -17,7 +18,7 @@ def health_check():
     """Health check endpoint for monitoring"""
     try:
         # Check database connectivity
-        db.session.execute('SELECT 1')
+        db.session.execute(text('SELECT 1'))
 
         # Check if currency converter is working
         from app.currency import currency_converter