diff --git a/.gitignore b/.gitignore
index 6eb0d9f1..1755f6f1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -124,3 +124,5 @@ _book/
 
 backend/spiders
 spiders/*.zip
+
+vendor/
diff --git a/backend/services/log.go b/backend/services/log.go
index 11aaa4e9..d40c4331 100644
--- a/backend/services/log.go
+++ b/backend/services/log.go
@@ -145,7 +145,7 @@ func InitLogIndexes() error {
 	_ = c.EnsureIndex(mgo.Index{
 		Key:         []string{"expire_ts"},
 		Sparse:      true,
-		ExpireAfter: 0 * time.Second,
+		ExpireAfter: 1 * time.Second,
 	})
 	_ = ce.EnsureIndex(mgo.Index{
 		Key: []string{"task_id"},
@@ -156,7 +156,7 @@ func InitLogIndexes() error {
 	_ = ce.EnsureIndex(mgo.Index{
 		Key:         []string{"expire_ts"},
 		Sparse:      true,
-		ExpireAfter: 0 * time.Second,
+		ExpireAfter: 1 * time.Second,
 	})
 
 	return nil