updates

Backend/src/models/__init__.py

@@ -16,6 +16,8 @@ from .favorite import Favorite
 from .audit_log import AuditLog
 from .cookie_policy import CookiePolicy
 from .cookie_integration_config import CookieIntegrationConfig
+from .system_settings import SystemSettings
+from .invoice import Invoice, InvoiceItem
 
 __all__ = [
     "Role",
@@ -36,5 +38,8 @@ __all__ = [
     "AuditLog",
     "CookiePolicy",
     "CookieIntegrationConfig",
+    "SystemSettings",
+    "Invoice",
+    "InvoiceItem",
 ]