feat: mypy for all type check (#10921)

api/services/billing_service.py

@@ -1,4 +1,5 @@
 import os
+from typing import Optional
 
 import httpx
 from tenacity import retry, retry_if_not_exception_type, stop_before_delay, wait_fixed
@@ -58,11 +59,14 @@ class BillingService:
     def is_tenant_owner_or_admin(current_user):
         tenant_id = current_user.current_tenant_id
 
-        join = (
+        join: Optional[TenantAccountJoin] = (
             db.session.query(TenantAccountJoin)
             .filter(TenantAccountJoin.tenant_id == tenant_id, TenantAccountJoin.account_id == current_user.id)
             .first()
         )
 
+        if not join:
+            raise ValueError("Tenant account join not found")
+
         if not TenantAccountRole.is_privileged_role(join.role):
             raise ValueError("Only team owner or team admin can perform this action")