Add explicit session config within batch threads.

This may not be particularly necessary in general, but this change is
required to match previous functionality.

tailbone/views/products.py

@@ -51,6 +51,7 @@ from rattail.db.model import (
     Brand, Vendor, Department, Subdepartment, LabelProfile)
 from rattail.gpc import GPC
 from rattail.db.api import get_product_by_upc
+from rattail.db.util import configure_session
 from rattail.pod import get_image_url, get_image_path
 
 from ..db import Session
@@ -344,6 +345,7 @@ class CreateProductsBatch(ProductsGrid):
     def make_batch(self, provider, progress):
         from rattail.db import Session
         session = Session()
+        configure_session(session)
 
         self._filter_config = self.filter_config()
         self._sort_config = self.sort_config()