diff --git a/sql/schema.sql b/sql/schema.sql
index 96c1b69..0cc8153 100644
--- a/sql/schema.sql
+++ b/sql/schema.sql
@@ -314,3 +314,4 @@ begin
 end;
 
 create index if not exists idx_snh_operation_id_desc on squadrons_news_historical (operation_id desc);
+create index if not exists idx_shd_operation_id on squadrons_historical_data(operation_id);
\ No newline at end of file