diff --git a/internal/iplibrary/ip_item_test.go b/internal/iplibrary/ip_item_test.go
index 15e3b1f..1bdf114 100644
--- a/internal/iplibrary/ip_item_test.go
+++ b/internal/iplibrary/ip_item_test.go
@@ -79,7 +79,7 @@ func TestIPItem_Memory(t *testing.T) {
 	for i := 0; i < 2_000_000; i ++ {
 		list.Add(&IPItem{
 			Type:       "ip",
-			Id:         int64(i),
+			Id:         uint64(i),
 			IPFrom:     utils.IP2Long("192.168.1.1"),
 			IPTo:       0,
 			ExpiredAt:  time.Now().Unix(),
diff --git a/internal/iplibrary/ip_list_db.go b/internal/iplibrary/ip_list_db.go
index c90096f..dc29296 100644
--- a/internal/iplibrary/ip_list_db.go
+++ b/internal/iplibrary/ip_list_db.go
@@ -28,6 +28,8 @@ type IPListDB struct {
 	cleanTicker *time.Ticker
 
 	dir string
+
+	isClosed bool
 }
 
 func NewIPListDB() (*IPListDB, error) {
@@ -56,6 +58,12 @@ func (this *IPListDB) init() error {
 		return err
 	}
 	db.SetMaxOpenConns(1)
+
+	//_, err = db.Exec("VACUUM")
+	//if err != nil {
+	//	return err
+	//}
+
 	this.db = db
 
 	// 初始化数据库
@@ -117,6 +125,7 @@ ON "` + this.itemTableName + `" (
 
 	goman.New(func() {
 		events.On(events.EventQuit, func() {
+			_ = this.Close()
 			this.cleanTicker.Stop()
 		})
 
@@ -133,11 +142,19 @@ ON "` + this.itemTableName + `" (
 
 // DeleteExpiredItems 删除过期的条目
 func (this *IPListDB) DeleteExpiredItems() error {
+	if this.isClosed {
+		return nil
+	}
+
 	_, err := this.deleteExpiredItemsStmt.Exec(time.Now().Unix() - 7*86400)
 	return err
 }
 
 func (this *IPListDB) AddItem(item *pb.IPItem) error {
+	if this.isClosed {
+		return nil
+	}
+
 	_, err := this.deleteItemStmt.Exec(item.Id)
 	if err != nil {
 		return err
@@ -147,6 +164,10 @@ func (this *IPListDB) AddItem(item *pb.IPItem) error {
 }
 
 func (this *IPListDB) ReadItems(offset int64, size int64) (items []*pb.IPItem, err error) {
+	if this.isClosed {
+		return
+	}
+
 	rows, err := this.selectItemsStmt.Query(offset, size)
 	if err != nil {
 		return nil, err
@@ -169,6 +190,10 @@ func (this *IPListDB) ReadItems(offset int64, size int64) (items []*pb.IPItem, e
 
 // ReadMaxVersion 读取当前最大版本号
 func (this *IPListDB) ReadMaxVersion() int64 {
+	if this.isClosed {
+		return 0
+	}
+
 	row := this.selectMaxVersionStmt.QueryRow()
 	if row == nil {
 		return 0
@@ -182,6 +207,8 @@ func (this *IPListDB) ReadMaxVersion() int64 {
 }
 
 func (this *IPListDB) Close() error {
+	this.isClosed = true
+
 	if this.db != nil {
 		_ = this.deleteExpiredItemsStmt.Close()
 		_ = this.deleteItemStmt.Close()
diff --git a/internal/iplibrary/ip_list_db_test.go b/internal/iplibrary/ip_list_db_test.go
index 9e28bb5..fab894c 100644
--- a/internal/iplibrary/ip_list_db_test.go
+++ b/internal/iplibrary/ip_list_db_test.go
@@ -53,6 +53,11 @@ func TestIPListDB_ReadItems(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+
+	defer func() {
+		_ = db.Close()
+	}()
+
 	items, err := db.ReadItems(0, 2)
 	if err != nil {
 		t.Fatal(err)
diff --git a/internal/iplibrary/ip_list_test.go b/internal/iplibrary/ip_list_test.go
index 5be4c61..6c50234 100644
--- a/internal/iplibrary/ip_list_test.go
+++ b/internal/iplibrary/ip_list_test.go
@@ -144,7 +144,7 @@ func TestIPList_Contains(t *testing.T) {
 	list := NewIPList()
 	for i := 0; i < 255; i++ {
 		list.AddDelay(&IPItem{
-			Id:        int64(i),
+			Id:        uint64(i),
 			IPFrom:    utils.IP2Long(strconv.Itoa(i) + ".168.0.1"),
 			IPTo:      utils.IP2Long(strconv.Itoa(i) + ".168.255.1"),
 			ExpiredAt: 0,
@@ -152,7 +152,7 @@ func TestIPList_Contains(t *testing.T) {
 	}
 	for i := 0; i < 255; i++ {
 		list.AddDelay(&IPItem{
-			Id:     int64(1000 + i),
+			Id:     uint64(1000 + i),
 			IPFrom: utils.IP2Long("192.167.2." + strconv.Itoa(i)),
 		})
 	}
@@ -172,7 +172,7 @@ func TestIPList_Contains_Many(t *testing.T) {
 	list := NewIPList()
 	for i := 0; i < 1_000_000; i++ {
 		list.AddDelay(&IPItem{
-			Id:        int64(i),
+			Id:        uint64(i),
 			IPFrom:    utils.IP2Long(strconv.Itoa(rands.Int(0, 255)) + "." + strconv.Itoa(rands.Int(0, 255)) + "." + strconv.Itoa(rands.Int(0, 255)) + "." + strconv.Itoa(rands.Int(0, 255))),
 			IPTo:      utils.IP2Long(strconv.Itoa(rands.Int(0, 255)) + "." + strconv.Itoa(rands.Int(0, 255)) + "." + strconv.Itoa(rands.Int(0, 255)) + "." + strconv.Itoa(rands.Int(0, 255))),
 			ExpiredAt: 0,
@@ -217,7 +217,7 @@ func TestIPList_ContainsIPStrings(t *testing.T) {
 	list := NewIPList()
 	for i := 0; i < 255; i++ {
 		list.Add(&IPItem{
-			Id:        int64(i),
+			Id:        uint64(i),
 			IPFrom:    utils.IP2Long(strconv.Itoa(i) + ".168.0.1"),
 			IPTo:      utils.IP2Long(strconv.Itoa(i) + ".168.255.1"),
 			ExpiredAt: 0,
@@ -305,7 +305,7 @@ func BenchmarkIPList_Contains(b *testing.B) {
 	var list = NewIPList()
 	for i := 1; i < 200_000; i++ {
 		list.AddDelay(&IPItem{
-			Id:        int64(i),
+			Id:        uint64(i),
 			IPFrom:    utils.IP2Long(strconv.Itoa(rands.Int(0, 255)) + "." + strconv.Itoa(rands.Int(0, 255)) + ".0.1"),
 			IPTo:      utils.IP2Long(strconv.Itoa(rands.Int(0, 255)) + "." + strconv.Itoa(rands.Int(0, 255)) + ".0.1"),
 			ExpiredAt: time.Now().Unix() + 60,