formatting, indexes optimized

model.py

@@ -15,6 +15,8 @@ from sql import With
 from sql.functions import Function
 from sql.conditionals import Coalesce
 import copy
+from .const import DEF_NONE
+
 
 if config.get('cashbook', 'memcache', default='yes').lower() \
         in ['yes', '1', 'true']:
@@ -269,7 +271,7 @@ def order_name_hierarchical(model_name, tables):
     lines = With('id', 'name', 'name_path', recursive=True)
     lines.query = tab_mod.select(
             tab_mod.id, tab_mod.name, Array(tab_mod.name),
-            where=tab_mod.parent == None,
+            where=tab_mod.parent == DEF_NONE,
         )
     lines.query |= tab_mod2.join(
             lines,