Let the protection key restate itself

mongox/base/protection/key.go

@@ -1,6 +1,8 @@
 package protection
 
 import (
+	"time"
+
 	"go.mongodb.org/mongo-driver/bson/primitive"
 )
 
@@ -9,3 +11,9 @@ type Key struct {
 	X primitive.ObjectID `bson:"_x" json:"_x" index:",hashed"`
 	V int64              `bson:"_v" json:"_v"`
 }
+
+// Restate creates a new protection key
+func (k *Key) Restate() {
+	k.X = primitive.NewObjectID()
+	k.V = time.Now().Unix()
+}