diff --git a/handler/works/clean.go b/works/clean.go
similarity index 70%
rename from handler/works/clean.go
rename to works/clean.go
index baaf67b..f3bfb56 100644
--- a/handler/works/clean.go
+++ b/works/clean.go
@@ -5,11 +5,13 @@ import (
 	"os"
 	"time"
 
+	"git.lxtend.com/qqbot/sqlite3"
 	"git.lxtend.com/qqbot/util"
 )
 
 func init() {
 	util.AddCycleTask("cleanTmpFolder", 5*time.Minute, 5*time.Minute, cleanTmpFolder)
+	util.AddCycleTask("cleanDB", 1*time.Hour, 1*time.Hour, cleanDB)
 }
 
 func cleanTmpFolder() {
@@ -30,3 +32,10 @@ func cleanTmpFolder() {
 		}
 	}
 }
+
+func cleanDB() {
+	if time.Now().Weekday() == time.Sunday && time.Now().Hour() < 1 {
+		db := sqlite3.GetDB()
+		db.Exec("VACUUM")
+	}
+}