问我如何才能运行一个服务，该服务可以访问我的数据库并对其运行操作，但不会填满UI线程

EN

class DetectJobIntentService : Service() {

    private val TAG = "DetectJobIntentServi22"
    lateinit var repo: PhotoRepository
    lateinit var observer : Observer<MutableList<Photo>>

    override fun onBind(intent: Intent?): IBinder? {
        return null
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {

        val options = FirebaseVisionFaceDetectorOptions.Builder()
            .setClassificationMode(FirebaseVisionFaceDetectorOptions.ACCURATE)
            .setClassificationMode(FirebaseVisionFaceDetectorOptions.ALL_CLASSIFICATIONS)
            .setMinFaceSize(0.15f)
            .build()

        val detector = FirebaseVision.getInstance()
            .getVisionFaceDetector(options)

        repo = PhotoRepository(application)

        observer = Observer {
            for (file in it) {
                val image = FirebaseVisionImage.fromFilePath(application, Uri.parse(file.uri))
                AsyncTask.execute {
                    detector.detectInImage(image).addOnSuccessListener { list ->
                        if (list.isNotEmpty()) {
                            file.hasFaces = 1
                            repo.update(file)
                        } else {
                            file.hasFaces = 2
                            repo.update(file)
                        }
                    }
                }


            }
        }

        repo.getAllPhotos().observeForever(observer)

        val notificationIntent= Intent(this, MainActivity::class.java)
        val pendingIntent = PendingIntent.getActivity(this,
            0, notificationIntent, 0)

        val notification = NotificationCompat.Builder(this, getString(tech.levanter.anyvision.R.string.channel_id))
            .setContentTitle("Detecting faces..")
            .setContentText("64 photos detected")
            .setSmallIcon(tech.levanter.anyvision.R.drawable.ic_face)
            .setContentIntent(pendingIntent)
            .build()

        startForeground(1, notification)

        return START_NOT_STICKY
    }

    override fun onDestroy() {
        super.onDestroy()
        repo.getAllPhotos().removeObserver(observer)
    }

}