Generate zero-based orderings in reorder_paths

arkindex/documents/management/commands/reorder_paths.py

@@ -90,7 +90,7 @@ class Command(BaseCommand):
                 ROW_NUMBER() OVER (
                     PARTITION BY parent_id
                     ORDER BY ordering, name, element_id
-                ) AS ordering
+                ) - 1 AS ordering
             FROM (
                 SELECT
                     DISTINCT ON (element_id, path[array_length(path, 1)])