proper cache busting

app.py

@@ -15,6 +15,7 @@ from extensions import db, login_manager, csrf
 from utils.email_templates import create_default_templates
 from datetime import datetime
 from sqlalchemy import text
+from utils.asset_utils import get_asset_version
 
 # Load environment variables
 load_dotenv()
@@ -49,6 +50,11 @@ def create_app():
             db.session.commit()
         return dict(config=app.config, site_settings=site_settings)
 
+    @app.template_filter('asset_version')
+    def asset_version_filter(filename):
+        """Template filter to get version hash for static assets"""
+        return get_asset_version(filename) or ''
+
     # User loader for Flask-Login
     @login_manager.user_loader
     def load_user(user_id):