diff --git a/sql/ds.002.sql b/sql/ds.002.sql
index 4cd763f..2ab729e 100644
--- a/sql/ds.002.sql
+++ b/sql/ds.002.sql
@@ -1 +1,2 @@
-CREATE INDEX article_ympd ON article(year, month, published_date);
+CREATE INDEX article__ympd ON article(year, month, published_date);
+DROP INDEX article__year_month;