fix command struct

model/commands.go

@@ -13,7 +13,7 @@ type Commands struct {
 	Message string    `db:"message" cc:"message"`
 	Group   string    `db:"group" cc:"group"`
 	Ctime   time.Time `db:"ctime" cc:"ctime"`
-	Mtime   time.Time `db:"mtime" cc:"ctime"`
+	Mtime   time.Time `db:"mtime" cc:"mtime"`
 }
 
 // CommandsWithGroup -