Remove dead code

app.go

@@ -6,10 +6,8 @@ import (
 	"net"
 	"net/http"
 	"os"
-	"os/signal"
 	"path/filepath"
 	"strconv"
-	"time"
 
 	"github.com/gobuffalo/packr"
 )
@@ -17,12 +15,7 @@ import (
 // VersionString will be set through ldflags, contains current version
 var VersionString = "undefined"
 
-func cleanup() {
-	writeStats()
-}
-
 func main() {
-	c := make(chan os.Signal, 1)
 	log.Printf("AdGuard DNS web interface backend, version %s\n", VersionString)
 	box := packr.NewBox("build/static")
 	{
@@ -121,31 +114,8 @@ func main() {
 		log.Fatal(err)
 	}
 
-	err = loadStats()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	signal.Notify(c, os.Interrupt)
-	go func() {
-		<-c
-		cleanup()
-		os.Exit(1)
-	}()
-
-	go func() {
-		for range time.Tick(time.Hour * 24) {
-			err := writeStats()
-			if err != nil {
-				log.Printf("Couldn't write stats: %s", err)
-				// try later on next iteration, don't abort
-			}
-		}
-	}()
-
 	address := net.JoinHostPort(config.BindHost, strconv.Itoa(config.BindPort))
 
-	runStatsCollectors()
 	runFilterRefreshers()
 
 	http.Handle("/", optionalAuthHandler(http.FileServer(box)))