Initial commit: ContactSync Android app

- SyncAdapter with account type com.bitrix24.contacts.sync - Two-phase sync: download to Room DB, then import to phone contacts - FCM push for instant contact addition - WorkManager: periodic sync (30min) + heartbeat (1h) - QR code activation (JSON format) - Event log UI with LiveData - Auto-update mechanism via version.php - Duplicate contacts cleanup - CALLER_IS_SYNCADAPTER optimization for bulk inserts Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-14 10:41:16 +05:00
commit 125010bbe3
51 changed files with 2908 additions and 0 deletions
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -0,0 +1,89 @@
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.ksp)
+    alias(libs.plugins.google.services)
+}
+
+android {
+    namespace = "com.bitrix24.contactsync"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "com.bitrix24.contactsync"
+        minSdk = 26
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0.0"
+    }
+
+    signingConfigs {
+        create("release") {
+            storeFile = file("../release-keystore.jks")
+            storePassword = "ContactSync2024"
+            keyAlias = "contactsync"
+            keyPassword = "ContactSync2024"
+        }
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+            signingConfig = signingConfigs.getByName("release")
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+
+    buildFeatures {
+        viewBinding = true
+        buildConfig = true
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.appcompat)
+    implementation(libs.androidx.activity.ktx)
+    implementation(libs.material)
+
+    // Room
+    implementation(libs.room.runtime)
+    implementation(libs.room.ktx)
+    ksp(libs.room.compiler)
+
+    // WorkManager
+    implementation(libs.workmanager)
+
+    // Retrofit + OkHttp
+    implementation(libs.retrofit)
+    implementation(libs.retrofit.gson)
+    implementation(libs.okhttp)
+    implementation(libs.okhttp.logging)
+
+    // Firebase
+    implementation(platform(libs.firebase.bom))
+    implementation(libs.firebase.messaging)
+
+    // Lifecycle
+    implementation(libs.lifecycle.runtime)
+    implementation(libs.lifecycle.viewmodel)
+
+    // Coroutines
+    implementation(libs.coroutines.core)
+    implementation(libs.coroutines.android)
+
+    // QR Scanner
+    implementation(libs.zxing)
+}
--- a/app/google-services.json
+++ b/app/google-services.json
@@ -0,0 +1,29 @@
+{
+  "project_info": {
+    "project_number": "368687825001",
+    "project_id": "bitrix24-contactsyn",
+    "storage_bucket": "bitrix24-contactsyn.firebasestorage.app"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:368687825001:android:8e744a81d541706c1322f8",
+        "android_client_info": {
+          "package_name": "com.bitrix24.contactsync"
+        }
+      },
+      "oauth_client": [],
+      "api_key": [
+        {
+          "current_key": "AIzaSyCgC4KcfsTx9SqZTw0djr8xDn27dJRWXTw"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": []
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -0,0 +1,10 @@
+# Retrofit
+-keepattributes Signature
+-keepattributes *Annotation*
+-keep class com.bitrix24.contactsync.data.api.** { *; }
+-dontwarn okhttp3.**
+-dontwarn retrofit2.**
+
+# Room
+-keep class * extends androidx.room.RoomDatabase
+-keep @androidx.room.Entity class *
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.READ_CONTACTS" />
+    <uses-permission android:name="android.permission.WRITE_CONTACTS" />
+    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
+    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
+
+    <application
+        android:name=".App"
+        android:allowBackup="false"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.ContactSync">
+
+        <!-- Setup Activity -->
+        <activity
+            android:name=".ui.SetupActivity"
+            android:exported="true"
+            android:theme="@style/Theme.ContactSync">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <!-- Account Authenticator Service -->
+        <service
+            android:name=".sync.AccountAuthenticatorService"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.accounts.AccountAuthenticator" />
+            </intent-filter>
+            <meta-data
+                android:name="android.accounts.AccountAuthenticator"
+                android:resource="@xml/authenticator" />
+        </service>
+
+        <!-- Sync Adapter Service -->
+        <service
+            android:name=".sync.SyncService"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.content.SyncAdapter" />
+            </intent-filter>
+            <meta-data
+                android:name="android.content.SyncAdapter"
+                android:resource="@xml/syncadapter" />
+            <meta-data
+                android:name="android.provider.CONTACTS_STRUCTURE"
+                android:resource="@xml/contacts" />
+        </service>
+
+        <!-- FCM Service -->
+        <service
+            android:name=".fcm.FCMService"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="com.google.firebase.MESSAGING_EVENT" />
+            </intent-filter>
+        </service>
+
+        <!-- FileProvider for APK updates -->
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
+
+        <!-- Boot Receiver -->
+        <receiver
+            android:name=".receiver.BootReceiver"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+                <action android:name="android.intent.action.MY_PACKAGE_REPLACED" />
+            </intent-filter>
+        </receiver>
+
+    </application>
+
+</manifest>
--- a/app/src/main/java/com/bitrix24/contactsync/App.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/App.kt
@@ -0,0 +1,47 @@
+package com.bitrix24.contactsync
+
+import android.app.Application
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.util.Log
+import com.bitrix24.contactsync.data.PrefsManager
+import com.bitrix24.contactsync.worker.HeartbeatWorker
+import com.bitrix24.contactsync.worker.SyncWorker
+
+class App : Application() {
+
+    companion object {
+        private const val TAG = "ContactSyncApp"
+        const val NOTIFICATION_CHANNEL_SYNC = "sync_channel"
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+        Log.i(TAG, "Application started")
+
+        createNotificationChannels()
+        scheduleWorkersIfActivated()
+    }
+
+    private fun createNotificationChannels() {
+        val channel = NotificationChannel(
+            NOTIFICATION_CHANNEL_SYNC,
+            getString(R.string.sync_notification_channel),
+            NotificationManager.IMPORTANCE_LOW
+        ).apply {
+            description = "Уведомления о синхронизации контактов"
+        }
+
+        val manager = getSystemService(NotificationManager::class.java)
+        manager.createNotificationChannel(channel)
+    }
+
+    private fun scheduleWorkersIfActivated() {
+        val prefs = PrefsManager(this)
+        if (prefs.isActivated) {
+            SyncWorker.schedulePeriodicSync(this)
+            HeartbeatWorker.schedule(this)
+            Log.i(TAG, "Workers scheduled for activated device")
+        }
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/data/PrefsManager.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/data/PrefsManager.kt
@@ -0,0 +1,64 @@
+package com.bitrix24.contactsync.data
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.provider.Settings
+
+class PrefsManager(context: Context) {
+
+    private val prefs: SharedPreferences =
+        context.getSharedPreferences("contact_sync_prefs", Context.MODE_PRIVATE)
+
+    private val appContext = context.applicationContext
+
+    var serverUrl: String
+        get() = prefs.getString(KEY_SERVER_URL, "") ?: ""
+        set(value) = prefs.edit().putString(KEY_SERVER_URL, value).apply()
+
+    var deviceToken: String
+        get() = prefs.getString(KEY_DEVICE_TOKEN, "") ?: ""
+        set(value) = prefs.edit().putString(KEY_DEVICE_TOKEN, value).apply()
+
+    var pipelineId: Int
+        get() = prefs.getInt(KEY_PIPELINE_ID, 0)
+        set(value) = prefs.edit().putInt(KEY_PIPELINE_ID, value).apply()
+
+    var pipelineName: String
+        get() = prefs.getString(KEY_PIPELINE_NAME, "") ?: ""
+        set(value) = prefs.edit().putString(KEY_PIPELINE_NAME, value).apply()
+
+    var fcmToken: String
+        get() = prefs.getString(KEY_FCM_TOKEN, "") ?: ""
+        set(value) = prefs.edit().putString(KEY_FCM_TOKEN, value).apply()
+
+    var lastSyncTime: Long
+        get() = prefs.getLong(KEY_LAST_SYNC_TIME, 0)
+        set(value) = prefs.edit().putLong(KEY_LAST_SYNC_TIME, value).apply()
+
+    var contactsCount: Int
+        get() = prefs.getInt(KEY_CONTACTS_COUNT, 0)
+        set(value) = prefs.edit().putInt(KEY_CONTACTS_COUNT, value).apply()
+
+    val isActivated: Boolean
+        get() = deviceToken.isNotEmpty()
+
+    val deviceId: String
+        get() = Settings.Secure.getString(appContext.contentResolver, Settings.Secure.ANDROID_ID)
+
+    val accountName: String
+        get() = if (pipelineName.isNotEmpty()) "Bitrix24 — $pipelineName" else "Bitrix24 Contacts"
+
+    fun clear() {
+        prefs.edit().clear().apply()
+    }
+
+    companion object {
+        private const val KEY_SERVER_URL = "server_url"
+        private const val KEY_DEVICE_TOKEN = "device_token"
+        private const val KEY_PIPELINE_ID = "pipeline_id"
+        private const val KEY_PIPELINE_NAME = "pipeline_name"
+        private const val KEY_FCM_TOKEN = "fcm_token"
+        private const val KEY_LAST_SYNC_TIME = "last_sync_time"
+        private const val KEY_CONTACTS_COUNT = "contacts_count"
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/data/api/ApiClient.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/data/api/ApiClient.kt
@@ -0,0 +1,62 @@
+package com.bitrix24.contactsync.data.api
+
+import com.bitrix24.contactsync.BuildConfig
+import okhttp3.OkHttpClient
+import okhttp3.logging.HttpLoggingInterceptor
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+import java.util.concurrent.TimeUnit
+
+object ApiClient {
+
+    @Volatile
+    private var instance: ApiService? = null
+    private var currentBaseUrl: String? = null
+
+    fun getInstance(baseUrl: String): ApiService {
+        val normalizedUrl = normalizeBaseUrl(baseUrl)
+        if (instance != null && currentBaseUrl == normalizedUrl) {
+            return instance!!
+        }
+        synchronized(this) {
+            if (instance != null && currentBaseUrl == normalizedUrl) {
+                return instance!!
+            }
+
+            val clientBuilder = OkHttpClient.Builder()
+                .connectTimeout(30, TimeUnit.SECONDS)
+                .readTimeout(60, TimeUnit.SECONDS)
+                .writeTimeout(30, TimeUnit.SECONDS)
+
+            if (BuildConfig.DEBUG) {
+                val logging = HttpLoggingInterceptor().apply {
+                    level = HttpLoggingInterceptor.Level.BODY
+                }
+                clientBuilder.addInterceptor(logging)
+            }
+
+            val client = clientBuilder.build()
+
+            val retrofit = Retrofit.Builder()
+                .baseUrl(normalizedUrl)
+                .client(client)
+                .addConverterFactory(GsonConverterFactory.create())
+                .build()
+
+            instance = retrofit.create(ApiService::class.java)
+            currentBaseUrl = normalizedUrl
+            return instance!!
+        }
+    }
+
+    private fun normalizeBaseUrl(url: String): String {
+        var result = url.trim()
+        if (!result.startsWith("http://") && !result.startsWith("https://")) {
+            result = "https://$result"
+        }
+        if (!result.endsWith("/")) {
+            result = "$result/"
+        }
+        return result
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/data/api/ApiService.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/data/api/ApiService.kt
@@ -0,0 +1,23 @@
+package com.bitrix24.contactsync.data.api
+
+import retrofit2.http.*
+
+interface ApiService {
+
+    @POST("register.php")
+    suspend fun register(@Body request: RegisterRequest): RegisterResponse
+
+    @GET("contacts.php")
+    suspend fun getContacts(
+        @Query("device_token") deviceToken: String,
+        @Query("since") since: Long? = null,
+        @Query("offset") offset: Int = 0,
+        @Query("limit") limit: Int = 500
+    ): ContactsResponse
+
+    @POST("heartbeat.php")
+    suspend fun heartbeat(@Body request: HeartbeatRequest): HeartbeatResponse
+
+    @GET("version.php")
+    suspend fun checkVersion(): VersionResponse
+}
--- a/app/src/main/java/com/bitrix24/contactsync/data/api/Models.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/data/api/Models.kt
@@ -0,0 +1,53 @@
+package com.bitrix24.contactsync.data.api
+
+import com.google.gson.annotations.SerializedName
+
+// --- Request models ---
+
+data class RegisterRequest(
+    @SerializedName("device_id") val deviceId: String,
+    @SerializedName("activation_code") val activationCode: String,
+    @SerializedName("fcm_token") val fcmToken: String
+)
+
+data class HeartbeatRequest(
+    @SerializedName("device_token") val deviceToken: String,
+    @SerializedName("fcm_token") val fcmToken: String,
+    @SerializedName("contacts_count") val contactsCount: Int,
+    @SerializedName("last_sync") val lastSync: Long
+)
+
+// --- Response models ---
+
+data class RegisterResponse(
+    val success: Boolean,
+    @SerializedName("device_token") val deviceToken: String?,
+    @SerializedName("pipeline_id") val pipelineId: Int?,
+    @SerializedName("pipeline_name") val pipelineName: String?,
+    val error: String?
+)
+
+data class ContactsResponse(
+    val contacts: List<ContactData>,
+    val total: Int,
+    @SerializedName("has_more") val hasMore: Boolean,
+    @SerializedName("sync_timestamp") val syncTimestamp: Long
+)
+
+data class ContactData(
+    val id: Long,
+    val name: String,
+    val phones: List<String>
+)
+
+data class HeartbeatResponse(
+    val success: Boolean,
+    @SerializedName("force_sync") val forceSync: Boolean = false
+)
+
+data class VersionResponse(
+    @SerializedName("version_code") val versionCode: Int,
+    @SerializedName("version_name") val versionName: String,
+    val url: String,
+    val mandatory: Boolean = false
+)
--- a/app/src/main/java/com/bitrix24/contactsync/data/db/AppDatabase.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/data/db/AppDatabase.kt
@@ -0,0 +1,50 @@
+package com.bitrix24.contactsync.data.db
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+@Database(
+    entities = [SyncState::class, SyncedContact::class, EventLog::class],
+    version = 3,
+    exportSchema = false
+)
+abstract class AppDatabase : RoomDatabase() {
+
+    abstract fun syncStateDao(): SyncStateDao
+    abstract fun syncedContactDao(): SyncedContactDao
+    abstract fun eventLogDao(): EventLogDao
+
+    companion object {
+        @Volatile
+        private var instance: AppDatabase? = null
+
+        fun getInstance(context: Context): AppDatabase {
+            return instance ?: synchronized(this) {
+                val MIGRATION_2_3 = object : Migration(2, 3) {
+                    override fun migrate(db: SupportSQLiteDatabase) {
+                        db.execSQL("""
+                            CREATE TABLE IF NOT EXISTS event_log (
+                                id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+                                type TEXT NOT NULL,
+                                message TEXT NOT NULL,
+                                timestamp INTEGER NOT NULL
+                            )
+                        """)
+                    }
+                }
+
+                instance ?: Room.databaseBuilder(
+                    context.applicationContext,
+                    AppDatabase::class.java,
+                    "contact_sync.db"
+                ).addMigrations(MIGRATION_2_3)
+                .fallbackToDestructiveMigration()
+                .build().also { instance = it }
+            }
+        }
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/data/db/EventLog.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/data/db/EventLog.kt
@@ -0,0 +1,19 @@
+package com.bitrix24.contactsync.data.db
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "event_log")
+data class EventLog(
+    @PrimaryKey(autoGenerate = true)
+    val id: Long = 0,
+    val type: String,       // "push", "sync", "error"
+    val message: String,
+    val timestamp: Long = System.currentTimeMillis()
+) {
+    companion object {
+        const val TYPE_PUSH = "push"
+        const val TYPE_SYNC = "sync"
+        const val TYPE_ERROR = "error"
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/data/db/EventLogDao.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/data/db/EventLogDao.kt
@@ -0,0 +1,17 @@
+package com.bitrix24.contactsync.data.db
+
+import androidx.lifecycle.LiveData
+import androidx.room.*
+
+@Dao
+interface EventLogDao {
+
+    @Insert
+    suspend fun insert(event: EventLog)
+
+    @Query("SELECT * FROM event_log ORDER BY timestamp DESC LIMIT 100")
+    fun getRecentLive(): LiveData<List<EventLog>>
+
+    @Query("DELETE FROM event_log WHERE id NOT IN (SELECT id FROM event_log ORDER BY timestamp DESC LIMIT 100)")
+    suspend fun trimOld()
+}
--- a/app/src/main/java/com/bitrix24/contactsync/data/db/SyncState.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/data/db/SyncState.kt
@@ -0,0 +1,29 @@
+package com.bitrix24.contactsync.data.db
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "sync_state")
+data class SyncState(
+    @PrimaryKey
+    val key: String,
+    val value: String,
+    val updatedAt: Long = System.currentTimeMillis()
+) {
+    companion object {
+        const val KEY_LAST_SYNC_TIMESTAMP = "last_sync_timestamp"
+        const val KEY_CONTACTS_COUNT = "contacts_count"
+        const val KEY_LAST_SYNC_STATUS = "last_sync_status"
+    }
+}
+
+@Entity(tableName = "synced_contacts")
+data class SyncedContact(
+    @PrimaryKey
+    val bitrixId: Long,
+    val name: String,
+    val phones: String, // JSON array
+    val rawContactId: Long = 0,
+    val imported: Boolean = false,
+    val syncedAt: Long = System.currentTimeMillis()
+)
--- a/app/src/main/java/com/bitrix24/contactsync/data/db/SyncStateDao.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/data/db/SyncStateDao.kt
@@ -0,0 +1,66 @@
+package com.bitrix24.contactsync.data.db
+
+import androidx.room.*
+
+@Dao
+interface SyncStateDao {
+
+    @Query("SELECT value FROM sync_state WHERE `key` = :key")
+    suspend fun getValue(key: String): String?
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun setValue(state: SyncState)
+
+    suspend fun getLastSyncTimestamp(): Long {
+        return getValue(SyncState.KEY_LAST_SYNC_TIMESTAMP)?.toLongOrNull() ?: 0L
+    }
+
+    suspend fun setLastSyncTimestamp(timestamp: Long) {
+        setValue(SyncState(SyncState.KEY_LAST_SYNC_TIMESTAMP, timestamp.toString()))
+    }
+
+    suspend fun getContactsCount(): Int {
+        return getValue(SyncState.KEY_CONTACTS_COUNT)?.toIntOrNull() ?: 0
+    }
+
+    suspend fun setContactsCount(count: Int) {
+        setValue(SyncState(SyncState.KEY_CONTACTS_COUNT, count.toString()))
+    }
+}
+
+@Dao
+interface SyncedContactDao {
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun upsert(contact: SyncedContact)
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun upsertAll(contacts: List<SyncedContact>)
+
+    @Query("SELECT * FROM synced_contacts WHERE bitrixId = :bitrixId")
+    suspend fun getByBitrixId(bitrixId: Long): SyncedContact?
+
+    @Query("SELECT COUNT(*) FROM synced_contacts")
+    suspend fun getCount(): Int
+
+    @Query("SELECT COUNT(*) FROM synced_contacts WHERE imported = 0")
+    suspend fun getNotImportedCount(): Int
+
+    @Query("SELECT COUNT(*) FROM synced_contacts WHERE imported = 1")
+    suspend fun getImportedCount(): Int
+
+    @Query("SELECT * FROM synced_contacts WHERE imported = 0 LIMIT :limit")
+    suspend fun getNotImported(limit: Int): List<SyncedContact>
+
+    @Query("UPDATE synced_contacts SET imported = 1, rawContactId = :rawContactId WHERE bitrixId = :bitrixId")
+    suspend fun markImported(bitrixId: Long, rawContactId: Long)
+
+    @Query("UPDATE synced_contacts SET imported = 1 WHERE bitrixId IN (:ids)")
+    suspend fun markImportedBatch(ids: List<Long>)
+
+    @Query("SELECT * FROM synced_contacts")
+    suspend fun getAll(): List<SyncedContact>
+
+    @Query("DELETE FROM synced_contacts")
+    suspend fun deleteAll()
+}
--- a/app/src/main/java/com/bitrix24/contactsync/fcm/FCMService.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/fcm/FCMService.kt
@@ -0,0 +1,102 @@
+package com.bitrix24.contactsync.fcm
+
+import android.util.Log
+import com.bitrix24.contactsync.data.PrefsManager
+import com.bitrix24.contactsync.data.api.ContactData
+import com.bitrix24.contactsync.data.db.AppDatabase
+import com.bitrix24.contactsync.data.db.EventLog
+import com.bitrix24.contactsync.sync.AccountAuthenticatorService
+import com.bitrix24.contactsync.sync.ContactsManager
+import com.google.firebase.messaging.FirebaseMessagingService
+import com.google.firebase.messaging.RemoteMessage
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+
+class FCMService : FirebaseMessagingService() {
+
+    companion object {
+        private const val TAG = "FCMService"
+        private const val ACTION_ADD_CONTACT = "add_contact"
+        private const val ACTION_FORCE_SYNC = "force_sync"
+    }
+
+    private val scope = CoroutineScope(Dispatchers.IO)
+
+    override fun onNewToken(token: String) {
+        Log.d(TAG, "New FCM token: $token")
+        val prefs = PrefsManager(this)
+        prefs.fcmToken = token
+    }
+
+    override fun onMessageReceived(message: RemoteMessage) {
+        Log.d(TAG, "FCM message received: ${message.data}")
+        val data = message.data
+
+        when (data["action"]) {
+            ACTION_ADD_CONTACT -> handleAddContact(data)
+            ACTION_FORCE_SYNC -> handleForceSync()
+            else -> Log.w(TAG, "Unknown action: ${data["action"]}")
+        }
+    }
+
+    private fun handleAddContact(data: Map<String, String>) {
+        val prefs = PrefsManager(this)
+        if (!prefs.isActivated) return
+
+        val account = AccountAuthenticatorService.getAccount(this) ?: return
+
+        val contactId = data["contact_id"]?.toLongOrNull() ?: return
+        val name = data["name"] ?: return
+        val phonesJson = data["phones"] ?: "[]"
+
+        val phones: List<String> = try {
+            val type = object : TypeToken<List<String>>() {}.type
+            Gson().fromJson(phonesJson, type)
+        } catch (e: Exception) {
+            phonesJson.removeSurrounding("[", "]")
+                .split(",")
+                .map { it.trim().removeSurrounding("'").removeSurrounding("\"") }
+                .filter { it.isNotEmpty() }
+        }
+
+        val contact = ContactData(id = contactId, name = name, phones = phones)
+
+        try {
+            val contactsManager = ContactsManager(this)
+            contactsManager.upsertContact(account, contact)
+            Log.i(TAG, "Contact added/updated via FCM: $contactId - $name")
+            prefs.contactsCount = prefs.contactsCount + 1
+
+            logEvent(EventLog.TYPE_PUSH, "Push: $name (${phones.joinToString()})")
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to add contact from FCM", e)
+            logEvent(EventLog.TYPE_ERROR, "Ошибка push: $name — ${e.message}")
+        }
+    }
+
+    private fun handleForceSync() {
+        Log.i(TAG, "Force sync requested via FCM")
+        logEvent(EventLog.TYPE_SYNC, "Запрошена принудительная синхронизация")
+        val account = AccountAuthenticatorService.getAccount(this) ?: return
+        android.content.ContentResolver.requestSync(
+            account,
+            android.provider.ContactsContract.AUTHORITY,
+            android.os.Bundle.EMPTY
+        )
+    }
+
+    private fun logEvent(type: String, message: String) {
+        scope.launch {
+            try {
+                val db = AppDatabase.getInstance(this@FCMService)
+                db.eventLogDao().insert(EventLog(type = type, message = message))
+                db.eventLogDao().trimOld()
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to log event", e)
+            }
+        }
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/receiver/BootReceiver.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/receiver/BootReceiver.kt
@@ -0,0 +1,37 @@
+package com.bitrix24.contactsync.receiver
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.util.Log
+import com.bitrix24.contactsync.data.PrefsManager
+import com.bitrix24.contactsync.worker.HeartbeatWorker
+import com.bitrix24.contactsync.worker.SyncWorker
+
+class BootReceiver : BroadcastReceiver() {
+
+    companion object {
+        private const val TAG = "BootReceiver"
+    }
+
+    override fun onReceive(context: Context, intent: Intent) {
+        if (intent.action != Intent.ACTION_BOOT_COMPLETED &&
+            intent.action != Intent.ACTION_MY_PACKAGE_REPLACED) {
+            return
+        }
+
+        Log.i(TAG, "Boot/update received, re-scheduling workers")
+
+        val prefs = PrefsManager(context)
+        if (!prefs.isActivated) {
+            Log.i(TAG, "Device not activated, skipping")
+            return
+        }
+
+        SyncWorker.schedulePeriodicSync(context)
+        HeartbeatWorker.schedule(context)
+
+        // Request immediate sync after boot
+        SyncWorker.requestImmediateSync(context)
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/sync/AccountAuthenticatorService.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/sync/AccountAuthenticatorService.kt
@@ -0,0 +1,104 @@
+package com.bitrix24.contactsync.sync
+
+import android.accounts.*
+import android.app.Service
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.os.IBinder
+
+class AccountAuthenticatorService : Service() {
+
+    private lateinit var authenticator: StubAuthenticator
+
+    override fun onCreate() {
+        super.onCreate()
+        authenticator = StubAuthenticator(this)
+    }
+
+    override fun onBind(intent: Intent?): IBinder = authenticator.iBinder
+
+    companion object {
+        const val ACCOUNT_TYPE = "com.bitrix24.contacts.sync"
+
+        fun createAccount(context: Context, accountName: String): Account {
+            val account = Account(accountName, ACCOUNT_TYPE)
+            val accountManager = AccountManager.get(context)
+            val existing = accountManager.getAccountsByType(ACCOUNT_TYPE)
+            if (existing.isNotEmpty()) {
+                return existing[0]
+            }
+            accountManager.addAccountExplicitly(account, null, null)
+            return account
+        }
+
+        fun getAccount(context: Context): Account? {
+            val accountManager = AccountManager.get(context)
+            val accounts = accountManager.getAccountsByType(ACCOUNT_TYPE)
+            return accounts.firstOrNull()
+        }
+
+        fun removeAccount(context: Context) {
+            val accountManager = AccountManager.get(context)
+            val accounts = accountManager.getAccountsByType(ACCOUNT_TYPE)
+            for (account in accounts) {
+                accountManager.removeAccountExplicitly(account)
+            }
+        }
+    }
+}
+
+/**
+ * Stub authenticator — we don't need real authentication,
+ * but SyncAdapter requires an AccountAuthenticator.
+ */
+private class StubAuthenticator(context: Context) : AbstractAccountAuthenticator(context) {
+
+    override fun editProperties(response: AccountAuthenticatorResponse?, accountType: String?): Bundle {
+        throw UnsupportedOperationException()
+    }
+
+    override fun addAccount(
+        response: AccountAuthenticatorResponse?,
+        accountType: String?,
+        authTokenType: String?,
+        requiredFeatures: Array<out String>?,
+        options: Bundle?
+    ): Bundle? = null
+
+    override fun confirmCredentials(
+        response: AccountAuthenticatorResponse?,
+        account: Account?,
+        options: Bundle?
+    ): Bundle? = null
+
+    override fun getAuthToken(
+        response: AccountAuthenticatorResponse?,
+        account: Account?,
+        authTokenType: String?,
+        options: Bundle?
+    ): Bundle {
+        throw UnsupportedOperationException()
+    }
+
+    override fun getAuthTokenLabel(authTokenType: String?): String {
+        throw UnsupportedOperationException()
+    }
+
+    override fun updateCredentials(
+        response: AccountAuthenticatorResponse?,
+        account: Account?,
+        authTokenType: String?,
+        options: Bundle?
+    ): Bundle {
+        throw UnsupportedOperationException()
+    }
+
+    override fun hasFeatures(
+        response: AccountAuthenticatorResponse?,
+        account: Account?,
+        features: Array<out String>?
+    ): Bundle {
+        return Bundle().apply { putBoolean(AccountManager.KEY_BOOLEAN_RESULT, false) }
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/sync/ContactsManager.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/sync/ContactsManager.kt
@@ -0,0 +1,313 @@
+package com.bitrix24.contactsync.sync
+
+import android.accounts.Account
+import android.content.ContentProviderOperation
+import android.content.Context
+import android.database.Cursor
+import android.net.Uri
+import android.provider.ContactsContract
+import android.provider.ContactsContract.CommonDataKinds.Phone
+import android.provider.ContactsContract.CommonDataKinds.StructuredName
+import android.provider.ContactsContract.Data
+import android.provider.ContactsContract.RawContacts
+import android.util.Log
+import com.bitrix24.contactsync.data.api.ContactData
+
+class ContactsManager(private val context: Context) {
+
+    companion object {
+        private const val TAG = "ContactsManager"
+        // With CALLER_IS_SYNCADAPTER + yield every 10 contacts (~30 ops)
+        // we can safely do 500 contacts per applyBatch
+        private const val BULK_BATCH_SIZE = 500
+        private const val DELTA_BATCH_SIZE = 100
+        private const val YIELD_EVERY_N_CONTACTS = 10
+    }
+
+    // SyncAdapter URIs — skip aggregation and notifications for speed
+    private val rawContactsSyncUri: Uri = RawContacts.CONTENT_URI.buildUpon()
+        .appendQueryParameter(ContactsContract.CALLER_IS_SYNCADAPTER, "true")
+        .build()
+
+    private val dataSyncUri: Uri = Data.CONTENT_URI.buildUpon()
+        .appendQueryParameter(ContactsContract.CALLER_IS_SYNCADAPTER, "true")
+        .build()
+
+    /**
+     * Insert or update a single contact.
+     */
+    fun upsertContact(account: Account, contact: ContactData): Long {
+        val existingRawContactId = findRawContactByBitrixId(account, contact.id)
+        return if (existingRawContactId != null) {
+            updateContact(existingRawContactId, contact)
+            existingRawContactId
+        } else {
+            insertContact(account, contact)
+        }
+    }
+
+    /**
+     * Fast bulk insert — no duplicate checks, CALLER_IS_SYNCADAPTER, sparse yields.
+     * Use for initial sync only.
+     */
+    fun bulkInsertContacts(account: Account, contacts: List<ContactData>): Int {
+        var count = 0
+        for (chunk in contacts.chunked(BULK_BATCH_SIZE)) {
+            val ops = ArrayList<ContentProviderOperation>(chunk.size * 4)
+            for ((index, contact) in chunk.withIndex()) {
+                val needYield = (index % YIELD_EVERY_N_CONTACTS == 0)
+                buildFastInsertOps(account, contact, ops, needYield)
+            }
+            try {
+                context.contentResolver.applyBatch(ContactsContract.AUTHORITY, ops)
+                count += chunk.size
+            } catch (e: Exception) {
+                Log.e(TAG, "Bulk insert failed (${chunk.size} contacts, ${ops.size} ops), splitting", e)
+                // Split in half and retry
+                val half = chunk.size / 2
+                if (half > 0) {
+                    count += bulkInsertContacts(account, chunk.subList(0, half))
+                    count += bulkInsertContacts(account, chunk.subList(half, chunk.size))
+                } else {
+                    // Single contact, try individually
+                    for (contact in chunk) {
+                        try {
+                            insertContact(account, contact)
+                            count++
+                        } catch (e2: Exception) {
+                            Log.e(TAG, "Failed to insert contact ${contact.id}", e2)
+                        }
+                    }
+                }
+            }
+        }
+        return count
+    }
+
+    /**
+     * Batch insert/update with duplicate checks. Use for delta sync.
+     */
+    fun upsertContacts(account: Account, contacts: List<ContactData>): Int {
+        var count = 0
+        for (chunk in contacts.chunked(DELTA_BATCH_SIZE)) {
+            val ops = ArrayList<ContentProviderOperation>()
+            for ((index, contact) in chunk.withIndex()) {
+                val existingRawContactId = findRawContactByBitrixId(account, contact.id)
+                if (existingRawContactId != null) {
+                    buildUpdateOps(existingRawContactId, contact, ops)
+                } else {
+                    val needYield = (index % YIELD_EVERY_N_CONTACTS == 0)
+                    buildFastInsertOps(account, contact, ops, needYield)
+                }
+            }
+            if (ops.isNotEmpty()) {
+                try {
+                    context.contentResolver.applyBatch(ContactsContract.AUTHORITY, ops)
+                    count += chunk.size
+                } catch (e: Exception) {
+                    Log.e(TAG, "Batch upsert failed, retrying individually", e)
+                    for (contact in chunk) {
+                        try {
+                            upsertContact(account, contact)
+                            count++
+                        } catch (e2: Exception) {
+                            Log.e(TAG, "Failed to upsert contact ${contact.id}", e2)
+                        }
+                    }
+                }
+            }
+        }
+        return count
+    }
+
+    private fun insertContact(account: Account, contact: ContactData): Long {
+        val ops = ArrayList<ContentProviderOperation>()
+        buildFastInsertOps(account, contact, ops, true)
+        val results = context.contentResolver.applyBatch(ContactsContract.AUTHORITY, ops)
+        return results[0].uri?.lastPathSegment?.toLongOrNull() ?: 0L
+    }
+
+    /**
+     * Build insert ops using SyncAdapter URIs (skips aggregation).
+     * Yield point only when needYield=true.
+     */
+    private fun buildFastInsertOps(
+        account: Account,
+        contact: ContactData,
+        ops: ArrayList<ContentProviderOperation>,
+        needYield: Boolean
+    ) {
+        val backRef = ops.size
+
+        val rawOp = ContentProviderOperation.newInsert(rawContactsSyncUri)
+            .withValue(RawContacts.ACCOUNT_TYPE, account.type)
+            .withValue(RawContacts.ACCOUNT_NAME, account.name)
+            .withValue(RawContacts.SYNC1, contact.id.toString())
+            .withValue(RawContacts.SYNC2, System.currentTimeMillis().toString())
+            .withValue(RawContacts.AGGREGATION_MODE, RawContacts.AGGREGATION_MODE_SUSPENDED)
+
+        if (needYield) rawOp.withYieldAllowed(true)
+
+        ops.add(rawOp.build())
+
+        ops.add(
+            ContentProviderOperation.newInsert(dataSyncUri)
+                .withValueBackReference(Data.RAW_CONTACT_ID, backRef)
+                .withValue(Data.MIMETYPE, StructuredName.CONTENT_ITEM_TYPE)
+                .withValue(StructuredName.DISPLAY_NAME, contact.name)
+                .build()
+        )
+
+        for (phone in contact.phones) {
+            ops.add(
+                ContentProviderOperation.newInsert(dataSyncUri)
+                    .withValueBackReference(Data.RAW_CONTACT_ID, backRef)
+                    .withValue(Data.MIMETYPE, Phone.CONTENT_ITEM_TYPE)
+                    .withValue(Phone.NUMBER, phone)
+                    .withValue(Phone.TYPE, Phone.TYPE_MOBILE)
+                    .build()
+            )
+        }
+    }
+
+    private fun updateContact(rawContactId: Long, contact: ContactData) {
+        val ops = ArrayList<ContentProviderOperation>()
+        buildUpdateOps(rawContactId, contact, ops)
+        if (ops.isNotEmpty()) {
+            context.contentResolver.applyBatch(ContactsContract.AUTHORITY, ops)
+        }
+    }
+
+    private fun buildUpdateOps(
+        rawContactId: Long,
+        contact: ContactData,
+        ops: ArrayList<ContentProviderOperation>
+    ) {
+        ops.add(
+            ContentProviderOperation.newUpdate(dataSyncUri)
+                .withSelection(
+                    "${Data.RAW_CONTACT_ID} = ? AND ${Data.MIMETYPE} = ?",
+                    arrayOf(rawContactId.toString(), StructuredName.CONTENT_ITEM_TYPE)
+                )
+                .withValue(StructuredName.DISPLAY_NAME, contact.name)
+                .build()
+        )
+
+        ops.add(
+            ContentProviderOperation.newDelete(dataSyncUri)
+                .withSelection(
+                    "${Data.RAW_CONTACT_ID} = ? AND ${Data.MIMETYPE} = ?",
+                    arrayOf(rawContactId.toString(), Phone.CONTENT_ITEM_TYPE)
+                )
+                .build()
+        )
+
+        for (phone in contact.phones) {
+            ops.add(
+                ContentProviderOperation.newInsert(dataSyncUri)
+                    .withValue(Data.RAW_CONTACT_ID, rawContactId)
+                    .withValue(Data.MIMETYPE, Phone.CONTENT_ITEM_TYPE)
+                    .withValue(Phone.NUMBER, phone)
+                    .withValue(Phone.TYPE, Phone.TYPE_MOBILE)
+                    .build()
+            )
+        }
+
+        ops.add(
+            ContentProviderOperation.newUpdate(rawContactsSyncUri)
+                .withSelection("${RawContacts._ID} = ?", arrayOf(rawContactId.toString()))
+                .withValue(RawContacts.SYNC2, System.currentTimeMillis().toString())
+                .build()
+        )
+    }
+
+    fun findRawContactByBitrixId(account: Account, bitrixId: Long): Long? {
+        val cursor: Cursor? = context.contentResolver.query(
+            RawContacts.CONTENT_URI,
+            arrayOf(RawContacts._ID),
+            "${RawContacts.ACCOUNT_TYPE} = ? AND ${RawContacts.ACCOUNT_NAME} = ? AND ${RawContacts.SYNC1} = ? AND ${RawContacts.DELETED} = 0",
+            arrayOf(account.type, account.name, bitrixId.toString()),
+            null
+        )
+        cursor?.use {
+            if (it.moveToFirst()) return it.getLong(0)
+        }
+        return null
+    }
+
+    /**
+     * Remove duplicate contacts — keeps the oldest rawContactId per SYNC1,
+     * deletes all newer duplicates.
+     */
+    fun removeDuplicates(account: Account): Int {
+        // Collect all SYNC1 → list of rawContactIds
+        val cursor: Cursor? = context.contentResolver.query(
+            RawContacts.CONTENT_URI,
+            arrayOf(RawContacts._ID, RawContacts.SYNC1),
+            "${RawContacts.ACCOUNT_TYPE} = ? AND ${RawContacts.ACCOUNT_NAME} = ? AND ${RawContacts.DELETED} = 0",
+            arrayOf(account.type, account.name),
+            "${RawContacts.SYNC1} ASC, ${RawContacts._ID} ASC"
+        )
+
+        val duplicateIds = mutableListOf<Long>()
+        val seen = mutableMapOf<String, Long>() // SYNC1 → first rawContactId
+
+        cursor?.use {
+            val idCol = it.getColumnIndexOrThrow(RawContacts._ID)
+            val sync1Col = it.getColumnIndexOrThrow(RawContacts.SYNC1)
+            while (it.moveToNext()) {
+                val rawId = it.getLong(idCol)
+                val sync1 = it.getString(sync1Col) ?: continue
+                if (seen.containsKey(sync1)) {
+                    duplicateIds.add(rawId)
+                } else {
+                    seen[sync1] = rawId
+                }
+            }
+        }
+
+        if (duplicateIds.isEmpty()) {
+            Log.i(TAG, "No duplicates found")
+            return 0
+        }
+
+        Log.i(TAG, "Found ${duplicateIds.size} duplicates, removing...")
+
+        // Delete in batches
+        var deleted = 0
+        for (chunk in duplicateIds.chunked(100)) {
+            val ops = ArrayList<ContentProviderOperation>()
+            for (id in chunk) {
+                ops.add(
+                    ContentProviderOperation.newDelete(rawContactsSyncUri)
+                        .withSelection("${RawContacts._ID} = ?", arrayOf(id.toString()))
+                        .withYieldAllowed(true)
+                        .build()
+                )
+            }
+            try {
+                context.contentResolver.applyBatch(ContactsContract.AUTHORITY, ops)
+                deleted += chunk.size
+                Log.i(TAG, "Deleted duplicates: $deleted / ${duplicateIds.size}")
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to delete duplicate batch", e)
+            }
+        }
+
+        Log.i(TAG, "Duplicate removal complete: $deleted removed")
+        return deleted
+    }
+
+    fun getContactsCount(account: Account): Int {
+        val cursor: Cursor? = context.contentResolver.query(
+            RawContacts.CONTENT_URI,
+            arrayOf(RawContacts._ID),
+            "${RawContacts.ACCOUNT_TYPE} = ? AND ${RawContacts.ACCOUNT_NAME} = ? AND ${RawContacts.DELETED} = 0",
+            arrayOf(account.type, account.name),
+            null
+        )
+        val count = cursor?.count ?: 0
+        cursor?.close()
+        return count
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/sync/SyncAdapter.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/sync/SyncAdapter.kt
@@ -0,0 +1,32 @@
+package com.bitrix24.contactsync.sync
+
+import android.accounts.Account
+import android.content.*
+import android.os.Bundle
+import android.util.Log
+import com.bitrix24.contactsync.worker.SyncWorker
+
+/**
+ * SyncAdapter stub — delegates actual work to SyncWorker to avoid
+ * parallel sync conflicts. Exists only to register the account type.
+ */
+class SyncAdapter(
+    context: Context,
+    autoInitialize: Boolean
+) : AbstractThreadedSyncAdapter(context, autoInitialize) {
+
+    companion object {
+        private const val TAG = "SyncAdapter"
+    }
+
+    override fun onPerformSync(
+        account: Account,
+        extras: Bundle,
+        authority: String,
+        provider: ContentProviderClient,
+        syncResult: SyncResult
+    ) {
+        Log.i(TAG, "SyncAdapter triggered, delegating to SyncWorker")
+        SyncWorker.requestImmediateSync(context)
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/sync/SyncService.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/sync/SyncService.kt
@@ -0,0 +1,23 @@
+package com.bitrix24.contactsync.sync
+
+import android.app.Service
+import android.content.Intent
+import android.os.IBinder
+
+class SyncService : Service() {
+
+    private lateinit var syncAdapter: SyncAdapter
+
+    override fun onCreate() {
+        super.onCreate()
+        synchronized(lock) {
+            syncAdapter = SyncAdapter(applicationContext, true)
+        }
+    }
+
+    override fun onBind(intent: Intent?): IBinder = syncAdapter.syncAdapterBinder
+
+    companion object {
+        private val lock = Any()
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/ui/AppUpdater.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/ui/AppUpdater.kt
@@ -0,0 +1,118 @@
+package com.bitrix24.contactsync.ui
+
+import android.app.DownloadManager
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.net.Uri
+import android.os.Environment
+import android.util.Log
+import androidx.core.content.FileProvider
+import com.bitrix24.contactsync.BuildConfig
+import com.bitrix24.contactsync.data.PrefsManager
+import com.bitrix24.contactsync.data.api.ApiClient
+import java.io.File
+
+class AppUpdater(private val context: Context) {
+
+    companion object {
+        private const val TAG = "AppUpdater"
+        private const val APK_FILENAME = "contactsync-update.apk"
+    }
+
+    data class UpdateInfo(
+        val versionCode: Int,
+        val versionName: String,
+        val url: String,
+        val mandatory: Boolean
+    )
+
+    /**
+     * Check if update is available. Returns UpdateInfo or null.
+     */
+    suspend fun checkForUpdate(): UpdateInfo? {
+        val prefs = PrefsManager(context)
+        if (!prefs.isActivated) return null
+
+        return try {
+            val api = ApiClient.getInstance(prefs.serverUrl)
+            val response = api.checkVersion()
+
+            val currentVersion = BuildConfig.VERSION_CODE
+            if (response.versionCode > currentVersion) {
+                Log.i(TAG, "Update available: ${response.versionName} (${response.versionCode}), current: $currentVersion")
+                UpdateInfo(
+                    versionCode = response.versionCode,
+                    versionName = response.versionName,
+                    url = response.url,
+                    mandatory = response.mandatory
+                )
+            } else {
+                Log.d(TAG, "App is up to date (v$currentVersion)")
+                null
+            }
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to check for updates", e)
+            null
+        }
+    }
+
+    /**
+     * Download and install APK update.
+     */
+    fun downloadAndInstall(update: UpdateInfo) {
+        // Clean old APK if exists
+        val apkFile = File(context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS), APK_FILENAME)
+        if (apkFile.exists()) apkFile.delete()
+
+        val downloadManager = context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
+
+        val request = DownloadManager.Request(Uri.parse(update.url))
+            .setTitle("Обновление ContactSync ${update.versionName}")
+            .setDescription("Загрузка обновления...")
+            .setDestinationInExternalFilesDir(context, Environment.DIRECTORY_DOWNLOADS, APK_FILENAME)
+            .setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
+
+        val downloadId = downloadManager.enqueue(request)
+        Log.i(TAG, "Download started: id=$downloadId, url=${update.url}")
+
+        // Listen for download completion
+        val receiver = object : BroadcastReceiver() {
+            override fun onReceive(ctx: Context, intent: Intent) {
+                val id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1)
+                if (id == downloadId) {
+                    ctx.unregisterReceiver(this)
+                    installApk(apkFile)
+                }
+            }
+        }
+
+        context.registerReceiver(
+            receiver,
+            IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE),
+            Context.RECEIVER_EXPORTED
+        )
+    }
+
+    private fun installApk(apkFile: File) {
+        if (!apkFile.exists()) {
+            Log.e(TAG, "APK file not found: ${apkFile.absolutePath}")
+            return
+        }
+
+        val uri = FileProvider.getUriForFile(
+            context,
+            "${BuildConfig.APPLICATION_ID}.fileprovider",
+            apkFile
+        )
+
+        val intent = Intent(Intent.ACTION_VIEW).apply {
+            setDataAndType(uri, "application/vnd.android.package-archive")
+            flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_GRANT_READ_URI_PERMISSION
+        }
+
+        context.startActivity(intent)
+        Log.i(TAG, "Install intent launched")
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/ui/EventLogAdapter.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/ui/EventLogAdapter.kt
@@ -0,0 +1,46 @@
+package com.bitrix24.contactsync.ui
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import com.bitrix24.contactsync.data.db.EventLog
+import com.bitrix24.contactsync.databinding.ItemEventLogBinding
+import java.text.SimpleDateFormat
+import java.util.*
+
+class EventLogAdapter : ListAdapter<EventLog, EventLogAdapter.ViewHolder>(DIFF) {
+
+    companion object {
+        private val DIFF = object : DiffUtil.ItemCallback<EventLog>() {
+            override fun areItemsTheSame(a: EventLog, b: EventLog) = a.id == b.id
+            override fun areContentsTheSame(a: EventLog, b: EventLog) = a == b
+        }
+        private val timeFmt = SimpleDateFormat("dd.MM HH:mm:ss", Locale.getDefault())
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val binding = ItemEventLogBinding.inflate(
+            LayoutInflater.from(parent.context), parent, false
+        )
+        return ViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        holder.bind(getItem(position))
+    }
+
+    class ViewHolder(private val b: ItemEventLogBinding) : RecyclerView.ViewHolder(b.root) {
+        fun bind(event: EventLog) {
+            b.txtIcon.text = when (event.type) {
+                EventLog.TYPE_PUSH -> "\u2709"   // ✉
+                EventLog.TYPE_SYNC -> "\u21BB"   // ↻
+                EventLog.TYPE_ERROR -> "\u26A0"  // ⚠
+                else -> "\u2022"                 // •
+            }
+            b.txtMessage.text = event.message
+            b.txtTime.text = timeFmt.format(Date(event.timestamp))
+        }
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/ui/SetupActivity.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/ui/SetupActivity.kt
@@ -0,0 +1,389 @@
+package com.bitrix24.contactsync.ui
+
+import android.Manifest
+import android.content.pm.PackageManager
+import android.os.Build
+import android.os.Bundle
+import android.view.View
+import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
+import androidx.lifecycle.lifecycleScope
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.work.WorkInfo
+import androidx.work.WorkManager
+import com.bitrix24.contactsync.BuildConfig
+import com.bitrix24.contactsync.R
+import com.bitrix24.contactsync.data.PrefsManager
+import com.bitrix24.contactsync.data.api.ApiClient
+import com.bitrix24.contactsync.data.api.RegisterRequest
+import com.bitrix24.contactsync.data.db.AppDatabase
+import com.bitrix24.contactsync.databinding.ActivitySetupBinding
+import com.bitrix24.contactsync.sync.AccountAuthenticatorService
+import com.bitrix24.contactsync.worker.HeartbeatWorker
+import com.bitrix24.contactsync.worker.SyncWorker
+import com.google.firebase.messaging.FirebaseMessaging
+import com.journeyapps.barcodescanner.ScanContract
+import com.journeyapps.barcodescanner.ScanOptions
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.tasks.await
+import java.text.SimpleDateFormat
+import java.util.*
+
+class SetupActivity : AppCompatActivity() {
+
+    private lateinit var binding: ActivitySetupBinding
+    private lateinit var prefs: PrefsManager
+    private lateinit var logAdapter: EventLogAdapter
+
+    private val requiredPermissions = buildList {
+        add(Manifest.permission.READ_CONTACTS)
+        add(Manifest.permission.WRITE_CONTACTS)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            add(Manifest.permission.POST_NOTIFICATIONS)
+        }
+    }.toTypedArray()
+
+    private val permissionLauncher = registerForActivityResult(
+        ActivityResultContracts.RequestMultiplePermissions()
+    ) { results ->
+        val allGranted = results.all { it.value }
+        if (!allGranted) {
+            Toast.makeText(this, "Требуются разрешения для работы", Toast.LENGTH_LONG).show()
+        }
+    }
+
+    private val qrScanLauncher = registerForActivityResult(ScanContract()) { result ->
+        if (result.contents != null) {
+            parseQrCode(result.contents)
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivitySetupBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        prefs = PrefsManager(this)
+        requestPermissions()
+        setupUI()
+        setupEventLog()
+        observeSyncProgress()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        updateStatusUI()
+        checkForUpdate()
+    }
+
+    private fun checkForUpdate() {
+        if (!prefs.isActivated || BuildConfig.DEBUG) return
+        lifecycleScope.launch {
+            val updater = AppUpdater(this@SetupActivity)
+            val update = updater.checkForUpdate() ?: return@launch
+
+            // Show update dialog
+            com.google.android.material.dialog.MaterialAlertDialogBuilder(this@SetupActivity)
+                .setTitle("Доступно обновление")
+                .setMessage("Версия ${update.versionName} доступна для установки.")
+                .setPositiveButton("Обновить") { _, _ ->
+                    updater.downloadAndInstall(update)
+                }
+                .setCancelable(!update.mandatory)
+                .apply {
+                    if (!update.mandatory) {
+                        setNegativeButton("Позже", null)
+                    }
+                }
+                .show()
+        }
+    }
+
+    private fun requestPermissions() {
+        val needed = requiredPermissions.filter {
+            ContextCompat.checkSelfPermission(this, it) != PackageManager.PERMISSION_GRANTED
+        }
+        if (needed.isNotEmpty()) {
+            permissionLauncher.launch(needed.toTypedArray())
+        }
+    }
+
+    private fun setupUI() {
+        binding.btnActivate.setOnClickListener { activate() }
+        binding.btnScanQr.setOnClickListener { scanQr() }
+        binding.btnSyncNow.setOnClickListener { syncNow() }
+    }
+
+    private fun setupEventLog() {
+        logAdapter = EventLogAdapter()
+        binding.recyclerLog.layoutManager = LinearLayoutManager(this)
+        binding.recyclerLog.adapter = logAdapter
+
+        AppDatabase.getInstance(this).eventLogDao().getRecentLive().observe(this) { events ->
+            if (prefs.isActivated) {
+                binding.cardLog.visibility = View.VISIBLE
+                // Refresh contacts count on every log update (catches push additions)
+                reloadPrefsAndUpdateUI()
+            }
+            if (events.isNullOrEmpty()) {
+                binding.txtLogEmpty.visibility = View.VISIBLE
+                binding.recyclerLog.visibility = View.GONE
+            } else {
+                binding.txtLogEmpty.visibility = View.GONE
+                binding.recyclerLog.visibility = View.VISIBLE
+                logAdapter.submitList(events)
+            }
+        }
+    }
+
+    private fun observeSyncProgress() {
+        // Observe one-time sync
+        WorkManager.getInstance(this)
+            .getWorkInfosForUniqueWorkLiveData(SyncWorker.WORK_NAME_ONCE)
+            .observe(this) { workInfos ->
+                val info = workInfos?.firstOrNull() ?: return@observe
+                handleWorkInfo(info)
+            }
+
+        // Observe periodic sync
+        WorkManager.getInstance(this)
+            .getWorkInfosForUniqueWorkLiveData(SyncWorker.WORK_NAME)
+            .observe(this) { workInfos ->
+                val info = workInfos?.firstOrNull() ?: return@observe
+                handleWorkInfo(info)
+            }
+    }
+
+    private fun handleWorkInfo(info: WorkInfo) {
+        when (info.state) {
+            WorkInfo.State.RUNNING -> {
+                val progress = info.progress
+                val phase = progress.getString(SyncWorker.KEY_PHASE) ?: ""
+                val current = progress.getInt(SyncWorker.KEY_CURRENT, 0)
+                val total = progress.getInt(SyncWorker.KEY_TOTAL, 0)
+
+                when (phase) {
+                    SyncWorker.PHASE_DOWNLOAD -> {
+                        if (total > 0) showPhaseProgress("Загрузка", current, total)
+                        else showSyncRunning()
+                    }
+                    SyncWorker.PHASE_IMPORT -> {
+                        if (total > 0) showPhaseProgress("Импорт в контакты", current, total)
+                        else showSyncRunning()
+                    }
+                    SyncWorker.PHASE_DONE -> {
+                        hideSyncProgress()
+                        reloadPrefsAndUpdateUI()
+                    }
+                    SyncWorker.PHASE_ERROR -> {
+                        hideSyncProgress()
+                        binding.txtStatus.text = getString(R.string.status_error)
+                        binding.txtStatus.setTextColor(ContextCompat.getColor(this, R.color.error))
+                    }
+                    else -> {}
+                }
+            }
+            WorkInfo.State.SUCCEEDED, WorkInfo.State.ENQUEUED, WorkInfo.State.BLOCKED -> {
+                hideSyncProgress()
+                reloadPrefsAndUpdateUI()
+            }
+            WorkInfo.State.FAILED -> {
+                hideSyncProgress()
+                binding.txtStatus.text = getString(R.string.status_error)
+                binding.txtStatus.setTextColor(ContextCompat.getColor(this, R.color.error))
+            }
+            else -> {}
+        }
+    }
+
+    private fun reloadPrefsAndUpdateUI() {
+        // Re-read prefs since worker updated them in background
+        prefs = PrefsManager(this)
+        updateStatusUI()
+    }
+
+    private fun showSyncRunning() {
+        if (!prefs.isActivated) return
+        binding.cardStatus.visibility = View.VISIBLE
+        binding.progressSync.visibility = View.VISIBLE
+        binding.progressSync.isIndeterminate = true
+        binding.txtSyncProgress.visibility = View.VISIBLE
+        binding.txtSyncProgress.text = getString(R.string.status_syncing)
+        binding.txtStatus.text = getString(R.string.status_syncing)
+        binding.txtStatus.setTextColor(ContextCompat.getColor(this, R.color.primary))
+        binding.btnSyncNow.isEnabled = false
+    }
+
+    private fun showPhaseProgress(phaseName: String, current: Int, total: Int) {
+        if (!prefs.isActivated) return
+        binding.cardSetup.visibility = View.GONE
+        binding.cardStatus.visibility = View.VISIBLE
+        binding.progressSync.visibility = View.VISIBLE
+        binding.progressSync.isIndeterminate = false
+        binding.progressSync.max = total
+        binding.progressSync.progress = current
+        binding.txtSyncProgress.visibility = View.VISIBLE
+        binding.txtSyncProgress.text = "$phaseName: $current / $total"
+        binding.txtStatus.text = getString(R.string.status_syncing)
+        binding.txtStatus.setTextColor(ContextCompat.getColor(this, R.color.primary))
+        binding.txtContactsCount.text = getString(R.string.contacts_count_label, current)
+        binding.btnSyncNow.isEnabled = false
+    }
+
+    private fun hideSyncProgress() {
+        binding.progressSync.visibility = View.GONE
+        binding.txtSyncProgress.visibility = View.GONE
+        binding.btnSyncNow.isEnabled = true
+    }
+
+    private fun activate() {
+        val serverUrl = binding.editServerUrl.text.toString().trim()
+        val code = binding.editActivationCode.text.toString().trim()
+
+        if (serverUrl.isEmpty() || code.isEmpty()) {
+            Toast.makeText(this, R.string.error_empty_fields, Toast.LENGTH_SHORT).show()
+            return
+        }
+
+        setActivating(true)
+
+        lifecycleScope.launch {
+            try {
+                val fcmToken = FirebaseMessaging.getInstance().token.await()
+                prefs.fcmToken = fcmToken
+
+                val api = ApiClient.getInstance(serverUrl)
+                val response = api.register(
+                    RegisterRequest(
+                        deviceId = prefs.deviceId,
+                        activationCode = code,
+                        fcmToken = fcmToken
+                    )
+                )
+
+                if (response.success && response.deviceToken != null) {
+                    prefs.serverUrl = serverUrl
+                    prefs.deviceToken = response.deviceToken
+                    prefs.pipelineId = response.pipelineId ?: 0
+                    prefs.pipelineName = response.pipelineName ?: ""
+
+                    AccountAuthenticatorService.createAccount(
+                        this@SetupActivity,
+                        prefs.accountName
+                    )
+
+                    SyncWorker.schedulePeriodicSync(this@SetupActivity)
+                    HeartbeatWorker.schedule(this@SetupActivity)
+                    SyncWorker.requestImmediateSync(this@SetupActivity)
+
+                    Toast.makeText(
+                        this@SetupActivity,
+                        "Активировано! Синхронизация запущена.",
+                        Toast.LENGTH_LONG
+                    ).show()
+
+                    updateStatusUI()
+                } else {
+                    val error = response.error ?: "Неизвестная ошибка"
+                    Toast.makeText(
+                        this@SetupActivity,
+                        getString(R.string.error_activation_failed, error),
+                        Toast.LENGTH_LONG
+                    ).show()
+                }
+            } catch (e: Exception) {
+                Toast.makeText(
+                    this@SetupActivity,
+                    getString(R.string.error_activation_failed, e.message ?: "Ошибка сети"),
+                    Toast.LENGTH_LONG
+                ).show()
+            } finally {
+                setActivating(false)
+            }
+        }
+    }
+
+    private fun scanQr() {
+        val options = ScanOptions().apply {
+            setDesiredBarcodeFormats(ScanOptions.QR_CODE)
+            setPrompt("Наведите камеру на QR-код")
+            setBeepEnabled(false)
+            setOrientationLocked(true)
+        }
+        qrScanLauncher.launch(options)
+    }
+
+    private fun parseQrCode(contents: String) {
+        val trimmed = contents
+            .replace("\uFEFF", "")
+            .replace("\u0000", "")
+            .replace(Regex("[^\\x20-\\x7E\\u0400-\\u04FF\\u0500-\\u052F{}\\[\\]:,\"'\\-.]"), "")
+            .trim()
+
+        if (trimmed.startsWith("{")) {
+            try {
+                val json = org.json.JSONObject(trimmed)
+                val code = json.optString("code", "")
+                val api = json.optString("api", "")
+                if (code.isNotEmpty()) binding.editActivationCode.setText(code)
+                if (api.isNotEmpty()) binding.editServerUrl.setText(api)
+                return
+            } catch (_: Exception) {}
+        }
+
+        if (trimmed.startsWith("bitrix24sync://")) {
+            try {
+                val uri = android.net.Uri.parse(trimmed)
+                val server = uri.host ?: ""
+                val code = uri.getQueryParameter("code") ?: ""
+                if (server.isNotEmpty()) binding.editServerUrl.setText("https://$server")
+                if (code.isNotEmpty()) binding.editActivationCode.setText(code)
+                return
+            } catch (_: Exception) {}
+        }
+
+        binding.editActivationCode.setText(trimmed)
+    }
+
+    private fun syncNow() {
+        SyncWorker.requestImmediateSync(this)
+        binding.txtStatus.text = getString(R.string.status_syncing)
+        binding.txtStatus.setTextColor(ContextCompat.getColor(this, R.color.primary))
+        binding.btnSyncNow.isEnabled = false
+    }
+
+    private fun updateStatusUI() {
+        if (prefs.isActivated) {
+            binding.cardSetup.visibility = View.GONE
+            binding.cardStatus.visibility = View.VISIBLE
+
+            binding.txtPipeline.text = getString(R.string.pipeline_label, prefs.pipelineName)
+            binding.txtContactsCount.text = getString(R.string.contacts_count_label, prefs.contactsCount)
+
+            val lastSync = if (prefs.lastSyncTime > 0) {
+                val fmt = SimpleDateFormat("dd.MM.yyyy HH:mm", Locale.getDefault())
+                fmt.format(Date(prefs.lastSyncTime))
+            } else {
+                getString(R.string.never)
+            }
+            binding.txtLastSync.text = getString(R.string.last_sync_label, lastSync)
+
+            binding.txtStatus.text = getString(R.string.status_synced)
+            binding.txtStatus.setTextColor(ContextCompat.getColor(this, R.color.success))
+        } else {
+            binding.cardSetup.visibility = View.VISIBLE
+            binding.cardStatus.visibility = View.GONE
+        }
+    }
+
+    private fun setActivating(loading: Boolean) {
+        binding.btnActivate.isEnabled = !loading
+        binding.btnActivate.text = if (loading) getString(R.string.setup_activating) else getString(R.string.setup_activate)
+        binding.progressActivation.visibility = if (loading) View.VISIBLE else View.GONE
+        binding.editServerUrl.isEnabled = !loading
+        binding.editActivationCode.isEnabled = !loading
+        binding.btnScanQr.isEnabled = !loading
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/worker/HeartbeatWorker.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/worker/HeartbeatWorker.kt
@@ -0,0 +1,81 @@
+package com.bitrix24.contactsync.worker
+
+import android.content.Context
+import android.util.Log
+import androidx.work.*
+import com.bitrix24.contactsync.data.PrefsManager
+import com.bitrix24.contactsync.data.api.ApiClient
+import com.bitrix24.contactsync.data.api.HeartbeatRequest
+import com.bitrix24.contactsync.sync.AccountAuthenticatorService
+import com.bitrix24.contactsync.sync.ContactsManager
+import java.util.concurrent.TimeUnit
+
+class HeartbeatWorker(
+    context: Context,
+    params: WorkerParameters
+) : CoroutineWorker(context, params) {
+
+    companion object {
+        private const val TAG = "HeartbeatWorker"
+        const val WORK_NAME = "heartbeat_periodic"
+
+        fun schedule(context: Context) {
+            val constraints = Constraints.Builder()
+                .setRequiredNetworkType(NetworkType.CONNECTED)
+                .build()
+
+            val request = PeriodicWorkRequestBuilder<HeartbeatWorker>(1, TimeUnit.HOURS)
+                .setConstraints(constraints)
+                .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 10, TimeUnit.MINUTES)
+                .build()
+
+            WorkManager.getInstance(context)
+                .enqueueUniquePeriodicWork(
+                    WORK_NAME,
+                    ExistingPeriodicWorkPolicy.KEEP,
+                    request
+                )
+
+            Log.i(TAG, "Heartbeat scheduled (1 hour interval)")
+        }
+
+        fun cancel(context: Context) {
+            WorkManager.getInstance(context).cancelUniqueWork(WORK_NAME)
+        }
+    }
+
+    override suspend fun doWork(): Result {
+        val prefs = PrefsManager(applicationContext)
+        if (!prefs.isActivated) return Result.success()
+
+        return try {
+            val api = ApiClient.getInstance(prefs.serverUrl)
+
+            val account = AccountAuthenticatorService.getAccount(applicationContext)
+            val contactsCount = if (account != null) {
+                ContactsManager(applicationContext).getContactsCount(account)
+            } else {
+                prefs.contactsCount
+            }
+
+            val response = api.heartbeat(
+                HeartbeatRequest(
+                    deviceToken = prefs.deviceToken,
+                    fcmToken = prefs.fcmToken,
+                    contactsCount = contactsCount,
+                    lastSync = prefs.lastSyncTime / 1000
+                )
+            )
+
+            if (response.forceSync) {
+                Log.i(TAG, "Server requested force sync")
+                SyncWorker.requestImmediateSync(applicationContext)
+            }
+
+            Result.success()
+        } catch (e: Exception) {
+            Log.e(TAG, "Heartbeat failed", e)
+            if (runAttemptCount < 3) Result.retry() else Result.failure()
+        }
+    }
+}
--- a/app/src/main/java/com/bitrix24/contactsync/worker/SyncWorker.kt
+++ b/app/src/main/java/com/bitrix24/contactsync/worker/SyncWorker.kt
@@ -0,0 +1,277 @@
+package com.bitrix24.contactsync.worker
+
+import android.content.Context
+import android.util.Log
+import androidx.work.*
+import androidx.work.workDataOf
+import com.bitrix24.contactsync.data.PrefsManager
+import com.bitrix24.contactsync.data.api.ApiClient
+import com.bitrix24.contactsync.data.api.ContactData
+import com.bitrix24.contactsync.data.db.AppDatabase
+import com.bitrix24.contactsync.data.db.EventLog
+import com.bitrix24.contactsync.data.db.SyncedContact
+import com.bitrix24.contactsync.sync.AccountAuthenticatorService
+import com.bitrix24.contactsync.sync.ContactsManager
+import com.google.gson.Gson
+import java.util.concurrent.TimeUnit
+
+class SyncWorker(
+    context: Context,
+    params: WorkerParameters
+) : CoroutineWorker(context, params) {
+
+    companion object {
+        private const val TAG = "SyncWorker"
+        const val WORK_NAME = "contact_sync_periodic"
+        const val WORK_NAME_ONCE = "contact_sync_once"
+
+        // Progress keys
+        const val KEY_PHASE = "phase"
+        const val KEY_CURRENT = "current"
+        const val KEY_TOTAL = "total"
+
+        const val PHASE_DOWNLOAD = "download"
+        const val PHASE_IMPORT = "import"
+        const val PHASE_DONE = "done"
+        const val PHASE_ERROR = "error"
+
+        private const val IMPORT_BATCH_SIZE = 500
+
+        fun schedulePeriodicSync(context: Context) {
+            val constraints = Constraints.Builder()
+                .setRequiredNetworkType(NetworkType.CONNECTED)
+                .build()
+
+            val request = PeriodicWorkRequestBuilder<SyncWorker>(30, TimeUnit.MINUTES)
+                .setConstraints(constraints)
+                .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 5, TimeUnit.MINUTES)
+                .build()
+
+            WorkManager.getInstance(context)
+                .enqueueUniquePeriodicWork(
+                    WORK_NAME,
+                    ExistingPeriodicWorkPolicy.KEEP,
+                    request
+                )
+
+            Log.i(TAG, "Periodic sync scheduled (30 min interval)")
+        }
+
+        fun requestImmediateSync(context: Context) {
+            // Cancel periodic to avoid parallel run
+            WorkManager.getInstance(context).cancelUniqueWork(WORK_NAME)
+
+            val constraints = Constraints.Builder()
+                .setRequiredNetworkType(NetworkType.CONNECTED)
+                .build()
+
+            val request = OneTimeWorkRequestBuilder<SyncWorker>()
+                .setConstraints(constraints)
+                .build()
+
+            WorkManager.getInstance(context)
+                .enqueueUniqueWork(
+                    WORK_NAME_ONCE,
+                    ExistingWorkPolicy.REPLACE,
+                    request
+                )
+
+            Log.i(TAG, "Immediate sync requested (periodic cancelled)")
+        }
+
+        fun cancelPeriodicSync(context: Context) {
+            WorkManager.getInstance(context).cancelUniqueWork(WORK_NAME)
+        }
+    }
+
+    private val gson = Gson()
+
+    override suspend fun doWork(): Result {
+        Log.i(TAG, "SyncWorker started (attempt $runAttemptCount)")
+        val prefs = PrefsManager(applicationContext)
+
+        if (!prefs.isActivated) {
+            Log.w(TAG, "Device not activated, skipping")
+            return Result.success()
+        }
+
+        return try {
+            val db = AppDatabase.getInstance(applicationContext)
+
+            // One-time dedup: remove duplicate contacts from phone book
+            val dedupDone = db.syncStateDao().getValue("dedup_done")
+            if (dedupDone == null) {
+                val account = AccountAuthenticatorService.getAccount(applicationContext)
+                if (account != null) {
+                    val removed = ContactsManager(applicationContext).removeDuplicates(account)
+                    if (removed > 0) {
+                        db.eventLogDao().insert(EventLog(
+                            type = EventLog.TYPE_SYNC,
+                            message = "Удалено дубликатов: $removed"
+                        ))
+                    }
+                }
+                db.syncStateDao().setValue(com.bitrix24.contactsync.data.db.SyncState("dedup_done", "1"))
+            }
+
+            // Skip download if there are already non-imported contacts waiting
+            val pending = db.syncedContactDao().getNotImportedCount()
+            if (pending > 0) {
+                Log.i(TAG, "Skipping download — $pending contacts waiting for import")
+            } else {
+                // Phase 1: Download from server → Room DB
+                downloadContacts(prefs, db)
+            }
+
+            // Phase 2: Import from Room DB → phone contacts
+            importContacts(prefs, db)
+
+            // Log sync result
+            db.eventLogDao().insert(EventLog(
+                type = EventLog.TYPE_SYNC,
+                message = "Синхронизация: ${prefs.contactsCount} контактов"
+            ))
+            db.eventLogDao().trimOld()
+
+            // Re-schedule periodic sync
+            schedulePeriodicSync(applicationContext)
+
+            setProgress(workDataOf(
+                KEY_PHASE to PHASE_DONE,
+                KEY_CURRENT to prefs.contactsCount,
+                KEY_TOTAL to prefs.contactsCount
+            ))
+
+            Result.success()
+        } catch (e: Exception) {
+            Log.e(TAG, "Sync failed", e)
+            val db = AppDatabase.getInstance(applicationContext)
+            db.eventLogDao().insert(EventLog(
+                type = EventLog.TYPE_ERROR,
+                message = "Ошибка синхронизации: ${e.message?.take(100)}"
+            ))
+            setProgress(workDataOf(KEY_PHASE to PHASE_ERROR))
+            if (runAttemptCount < 3) Result.retry() else Result.failure()
+        }
+    }
+
+    /**
+     * Phase 1: Download all contacts from Bitrix API → local Room DB.
+     * Fast — only network + SQLite writes.
+     */
+    private suspend fun downloadContacts(prefs: PrefsManager, db: AppDatabase) {
+        val api = ApiClient.getInstance(prefs.serverUrl)
+        val lastTimestamp = db.syncStateDao().getLastSyncTimestamp()
+        val isInitialSync = lastTimestamp == 0L
+
+        var offset = 0
+        var totalDownloaded = 0
+        var serverTotal = 0
+
+        Log.i(TAG, "Phase 1: DOWNLOAD (${if (isInitialSync) "initial" else "delta"})")
+
+        do {
+            val response = api.getContacts(
+                deviceToken = prefs.deviceToken,
+                since = if (isInitialSync) null else lastTimestamp,
+                offset = offset,
+                limit = 500
+            )
+
+            serverTotal = response.total
+
+            // Convert API contacts to Room entities
+            val entities = response.contacts.map { contact ->
+                SyncedContact(
+                    bitrixId = contact.id,
+                    name = contact.name,
+                    phones = gson.toJson(contact.phones),
+                    imported = false
+                )
+            }
+
+            db.syncedContactDao().upsertAll(entities)
+            totalDownloaded += response.contacts.size
+            offset += response.contacts.size
+
+            setProgress(workDataOf(
+                KEY_PHASE to PHASE_DOWNLOAD,
+                KEY_CURRENT to totalDownloaded,
+                KEY_TOTAL to serverTotal
+            ))
+
+            Log.i(TAG, "Downloaded: $totalDownloaded / $serverTotal")
+
+            // Stop if server returned empty batch (delta sync edge case)
+            if (response.contacts.isEmpty()) break
+        } while (response.hasMore)
+
+        // Save timestamp immediately so next run does delta, not full
+        db.syncStateDao().setLastSyncTimestamp(System.currentTimeMillis() / 1000)
+
+        Log.i(TAG, "Phase 1 complete: $totalDownloaded contacts downloaded")
+    }
+
+    /**
+     * Phase 2: Import contacts from Room DB → Android phone book.
+     * Processes not-yet-imported contacts in batches.
+     */
+    private suspend fun importContacts(prefs: PrefsManager, db: AppDatabase) {
+        val contactsManager = ContactsManager(applicationContext)
+        val account = AccountAuthenticatorService.getAccount(applicationContext)
+            ?: throw IllegalStateException("No sync account found")
+
+        val totalToImport = db.syncedContactDao().getNotImportedCount()
+        val alreadyImported = db.syncedContactDao().getImportedCount()
+        val grandTotal = totalToImport + alreadyImported
+        var importedNow = 0
+
+        Log.i(TAG, "Phase 2: IMPORT ($totalToImport to import, $alreadyImported already done)")
+
+        while (true) {
+            val batch = db.syncedContactDao().getNotImported(IMPORT_BATCH_SIZE)
+            if (batch.isEmpty()) break
+
+            // Convert Room entities to ContactData for ContactsManager
+            val contacts = batch.map { entity ->
+                val phones: List<String> = try {
+                    gson.fromJson(entity.phones, Array<String>::class.java).toList()
+                } catch (_: Exception) {
+                    listOf(entity.phones)
+                }
+                ContactData(id = entity.bitrixId, name = entity.name, phones = phones)
+            }
+
+            // Use bulk insert only for truly initial import (nothing in phone book)
+            // Otherwise use upsert to avoid duplicates
+            if (alreadyImported == 0 && importedNow == 0) {
+                contactsManager.bulkInsertContacts(account, contacts)
+            } else {
+                contactsManager.upsertContacts(account, contacts)
+            }
+
+            // Mark as imported in Room
+            val ids = batch.map { it.bitrixId }
+            db.syncedContactDao().markImportedBatch(ids)
+
+            importedNow += batch.size
+
+            setProgress(workDataOf(
+                KEY_PHASE to PHASE_IMPORT,
+                KEY_CURRENT to (alreadyImported + importedNow),
+                KEY_TOTAL to grandTotal
+            ))
+
+            Log.i(TAG, "Imported: ${alreadyImported + importedNow} / $grandTotal")
+        }
+
+        // Save final state — use Room count instead of heavy ContactsContract COUNT
+        db.syncStateDao().setLastSyncTimestamp(System.currentTimeMillis() / 1000)
+        val finalCount = db.syncedContactDao().getImportedCount()
+        db.syncStateDao().setContactsCount(finalCount)
+        prefs.contactsCount = finalCount
+        prefs.lastSyncTime = System.currentTimeMillis()
+
+        Log.i(TAG, "Phase 2 complete: $importedNow imported, $finalCount total")
+    }
+}
--- a/app/src/main/res/drawable/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable/ic_launcher_foreground.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#2FC6F6"
+        android:pathData="M54,30 C40.7,30 30,40.7 30,54 C30,67.3 40.7,78 54,78 C67.3,78 78,67.3 78,54 C78,40.7 67.3,30 54,30z M54,42 C58.4,42 62,45.6 62,50 C62,54.4 58.4,58 54,58 C49.6,58 46,54.4 46,50 C46,45.6 49.6,42 54,42z M54,73 C47,73 40.8,69.4 37.5,64 C37.6,59 48,56.2 54,56.2 C60,56.2 70.4,59 70.5,64 C67.2,69.4 61,73 54,73z" />
+</vector>
--- a/app/src/main/res/layout/activity_setup.xml
+++ b/app/src/main/res/layout/activity_setup.xml
@@ -0,0 +1,235 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/background"
+    android:fillViewport="true">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="24dp">
+
+        <!-- Header -->
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal"
+            android:layout_marginTop="32dp"
+            android:text="@string/app_name"
+            android:textColor="@color/primary"
+            android:textSize="24sp"
+            android:textStyle="bold" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal"
+            android:layout_marginTop="8dp"
+            android:text="@string/setup_title"
+            android:textColor="@color/text_secondary"
+            android:textSize="16sp" />
+
+        <!-- Setup Form -->
+        <com.google.android.material.card.MaterialCardView
+            android:id="@+id/cardSetup"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="32dp"
+            app:cardCornerRadius="12dp"
+            app:cardElevation="2dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:padding="20dp">
+
+                <com.google.android.material.textfield.TextInputLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:hint="@string/setup_server_url"
+                    app:boxStrokeColor="@color/primary">
+
+                    <com.google.android.material.textfield.TextInputEditText
+                        android:id="@+id/editServerUrl"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:inputType="textUri" />
+
+                </com.google.android.material.textfield.TextInputLayout>
+
+                <com.google.android.material.textfield.TextInputLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="16dp"
+                    android:hint="@string/setup_activation_code"
+                    app:boxStrokeColor="@color/primary">
+
+                    <com.google.android.material.textfield.TextInputEditText
+                        android:id="@+id/editActivationCode"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:inputType="textCapCharacters"
+                        android:maxLength="20" />
+
+                </com.google.android.material.textfield.TextInputLayout>
+
+                <com.google.android.material.button.MaterialButton
+                    android:id="@+id/btnScanQr"
+                    style="@style/Widget.Material3.Button.OutlinedButton"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="12dp"
+                    android:text="@string/setup_scan_qr"
+                    app:icon="@android:drawable/ic_menu_camera"
+                    app:iconGravity="textStart" />
+
+                <com.google.android.material.button.MaterialButton
+                    android:id="@+id/btnActivate"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="16dp"
+                    android:text="@string/setup_activate"
+                    app:backgroundTint="@color/primary" />
+
+                <ProgressBar
+                    android:id="@+id/progressActivation"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center"
+                    android:layout_marginTop="16dp"
+                    android:visibility="gone" />
+
+            </LinearLayout>
+
+        </com.google.android.material.card.MaterialCardView>
+
+        <!-- Status Card (shown after activation) -->
+        <com.google.android.material.card.MaterialCardView
+            android:id="@+id/cardStatus"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="24dp"
+            android:visibility="gone"
+            app:cardCornerRadius="12dp"
+            app:cardElevation="2dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:padding="20dp">
+
+                <TextView
+                    android:id="@+id/txtPipeline"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:textColor="@color/text_primary"
+                    android:textSize="18sp"
+                    android:textStyle="bold" />
+
+                <TextView
+                    android:id="@+id/txtContactsCount"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="8dp"
+                    android:textColor="@color/text_secondary"
+                    android:textSize="14sp" />
+
+                <TextView
+                    android:id="@+id/txtLastSync"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="4dp"
+                    android:textColor="@color/text_secondary"
+                    android:textSize="14sp" />
+
+                <TextView
+                    android:id="@+id/txtStatus"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="8dp"
+                    android:textSize="14sp" />
+
+                <ProgressBar
+                    android:id="@+id/progressSync"
+                    style="@android:style/Widget.ProgressBar.Horizontal"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="12dp"
+                    android:max="100"
+                    android:visibility="gone" />
+
+                <TextView
+                    android:id="@+id/txtSyncProgress"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center_horizontal"
+                    android:layout_marginTop="4dp"
+                    android:textColor="@color/text_secondary"
+                    android:textSize="13sp"
+                    android:visibility="gone" />
+
+                <com.google.android.material.button.MaterialButton
+                    android:id="@+id/btnSyncNow"
+                    style="@style/Widget.Material3.Button.OutlinedButton"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="16dp"
+                    android:text="@string/sync_now" />
+
+            </LinearLayout>
+
+        </com.google.android.material.card.MaterialCardView>
+
+        <!-- Event Log Card -->
+        <com.google.android.material.card.MaterialCardView
+            android:id="@+id/cardLog"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:visibility="gone"
+            app:cardCornerRadius="12dp"
+            app:cardElevation="2dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:padding="16dp">
+
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/event_log_title"
+                    android:textColor="@color/text_primary"
+                    android:textSize="16sp"
+                    android:textStyle="bold" />
+
+                <androidx.recyclerview.widget.RecyclerView
+                    android:id="@+id/recyclerLog"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="8dp"
+                    android:nestedScrollingEnabled="false" />
+
+                <TextView
+                    android:id="@+id/txtLogEmpty"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center"
+                    android:layout_marginTop="8dp"
+                    android:text="@string/event_log_empty"
+                    android:textColor="@color/text_secondary"
+                    android:textSize="13sp" />
+
+            </LinearLayout>
+
+        </com.google.android.material.card.MaterialCardView>
+
+    </LinearLayout>
+
+</ScrollView>
--- a/app/src/main/res/layout/item_event_log.xml
+++ b/app/src/main/res/layout/item_event_log.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="horizontal"
+    android:paddingVertical="6dp">
+
+    <TextView
+        android:id="@+id/txtIcon"
+        android:layout_width="20dp"
+        android:layout_height="wrap_content"
+        android:textSize="12sp"
+        android:gravity="center" />
+
+    <LinearLayout
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:orientation="vertical"
+        android:layout_marginStart="8dp">
+
+        <TextView
+            android:id="@+id/txtMessage"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:textColor="@color/text_primary"
+            android:textSize="13sp"
+            android:maxLines="2"
+            android:ellipsize="end" />
+
+        <TextView
+            android:id="@+id/txtTime"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textColor="@color/text_secondary"
+            android:textSize="11sp" />
+
+    </LinearLayout>
+
+</LinearLayout>
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/primary" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
--- a/app/src/main/res/mipmap-hdpi/ic_launcher.xml
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/primary" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
--- a/app/src/main/res/mipmap-xhdpi/ic_launcher.xml
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/primary" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
--- a/app/src/main/res/mipmap-xxhdpi/ic_launcher.xml
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/primary" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="primary">#2FC6F6</color>
+    <color name="primary_dark">#0B97C4</color>
+    <color name="accent">#FF6D00</color>
+    <color name="white">#FFFFFF</color>
+    <color name="background">#F5F5F5</color>
+    <color name="text_primary">#212121</color>
+    <color name="text_secondary">#757575</color>
+    <color name="success">#4CAF50</color>
+    <color name="error">#F44336</color>
+</resources>
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Bitrix24 Контакты</string>
+    <string name="account_label">Bitrix24 Contacts Sync</string>
+
+    <string name="setup_title">Настройка синхронизации</string>
+    <string name="setup_server_url">URL сервера Bitrix24</string>
+    <string name="setup_server_url_hint">https://bitrix.example.ru</string>
+    <string name="setup_activation_code">Код активации</string>
+    <string name="setup_activation_code_hint">Например: HOH2024</string>
+    <string name="setup_scan_qr">Сканировать QR-код</string>
+    <string name="setup_activate">Активировать</string>
+    <string name="setup_activating">Активация…</string>
+
+    <string name="status_not_configured">Не настроено</string>
+    <string name="status_syncing">Синхронизация…</string>
+    <string name="status_synced">Синхронизировано</string>
+    <string name="status_error">Ошибка синхронизации</string>
+
+    <string name="sync_notification_channel">Синхронизация контактов</string>
+    <string name="sync_notification_title">Синхронизация контактов</string>
+    <string name="sync_notification_progress">Загружено %1$d из %2$d контактов</string>
+    <string name="sync_notification_done">Синхронизация завершена: %1$d контактов</string>
+
+    <string name="error_empty_fields">Заполните все поля</string>
+    <string name="error_invalid_url">Некорректный URL</string>
+    <string name="error_activation_failed">Ошибка активации: %1$s</string>
+    <string name="error_network">Ошибка сети</string>
+
+    <string name="pipeline_label">Воронка: %1$s</string>
+    <string name="contacts_count_label">Контактов: %1$d</string>
+    <string name="last_sync_label">Последняя синхронизация: %1$s</string>
+    <string name="sync_now">Синхронизировать сейчас</string>
+    <string name="never">никогда</string>
+    <string name="event_log_title">История событий</string>
+    <string name="event_log_empty">Нет событий</string>
+</resources>
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.ContactSync" parent="Theme.Material3.Light.NoActionBar">
+        <item name="colorPrimary">@color/primary</item>
+        <item name="colorPrimaryDark">@color/primary_dark</item>
+        <item name="colorAccent">@color/accent</item>
+        <item name="android:statusBarColor">@color/primary_dark</item>
+    </style>
+</resources>
--- a/app/src/main/res/xml/authenticator.xml
+++ b/app/src/main/res/xml/authenticator.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<account-authenticator xmlns:android="http://schemas.android.com/apk/res/android"
+    android:accountType="com.bitrix24.contacts.sync"
+    android:icon="@mipmap/ic_launcher"
+    android:label="@string/account_label"
+    android:smallIcon="@mipmap/ic_launcher" />
--- a/app/src/main/res/xml/contacts.xml
+++ b/app/src/main/res/xml/contacts.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ContactsAccountType xmlns:android="http://schemas.android.com/apk/res/android">
+    <ContactsDataKind
+        android:mimeType="vnd.android.cursor.item/vnd.com.bitrix24.contactsync.profile"
+        android:summaryColumn="data2"
+        android:detailColumn="data3" />
+</ContactsAccountType>
--- a/app/src/main/res/xml/file_paths.xml
+++ b/app/src/main/res/xml/file_paths.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths>
+    <external-files-path
+        name="downloads"
+        path="Download/" />
+</paths>
--- a/app/src/main/res/xml/syncadapter.xml
+++ b/app/src/main/res/xml/syncadapter.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<sync-adapter xmlns:android="http://schemas.android.com/apk/res/android"
+    android:accountType="com.bitrix24.contacts.sync"
+    android:contentAuthority="com.android.contacts"
+    android:isAlwaysSyncable="true"
+    android:supportsUploading="false"
+    android:userVisible="true" />