update

backend/app/auth_routes.py

@@ -366,7 +366,10 @@ async def google_callback(
                 db.rollback()
                 return RedirectResponse(url=f"{dest}?auth_error=invite_email_mismatch")
             raise
+        # Pending TenantMembership rows are invisible to SQL until flushed.
+        db.flush()
         _bootstrap_membership_if_needed(db, user)
+        db.flush()
         current_tid = _pick_current_tenant_id(db, user, invite_tid)
         if current_tid is None:
             db.rollback()