diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/Main.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/Main.kt
index e3baeb2..1a46b38 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/Main.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/Main.kt
@@ -27,7 +27,7 @@ fun Application.module() {
         runBlocking { koin.getOrNull<CacheStorage>()?.close() }
     }
     val koin = object : KoinComponent {}
-    configureSerialization()
+    configureSerialization(koin.get())
     configureJwt(koin.get())
     configureWebSocket(koin.get())
     configureRouting(koin.get(), koin.get())
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendUpdateFetcher.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendUpdateFetcher.kt
index 2198ece..05735a9 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendUpdateFetcher.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendUpdateFetcher.kt
@@ -1,6 +1,9 @@
 package ru.shadowsparky.vbox.backend.data
 
 import io.ktor.http.HttpStatusCode
+import io.ktor.util.cio.readChannel
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.Json
 import org.koin.core.annotation.Factory
@@ -28,8 +31,18 @@ class BackendUpdateFetcher(
     private val dispatcherProvider: DispatcherProvider,
     private val userId: Long
 ) : UpdateFetcher {
+    private val fetchMutex = Mutex()
+    private val updateFileMutex = Mutex()
 
-    override suspend fun fetch(versionCode: Long): UpdateInfo = withContext(dispatcherProvider.io) {
+    override suspend fun fetch(versionCode: Long): UpdateInfo  {
+        updateInfo?.let { return it }
+        fetchMutex.withLock {
+            updateInfo?.let { return it }
+            return fetchInternal().apply { updateInfo = this }
+        }
+    }
+
+    private suspend fun fetchInternal(): UpdateInfo = withContext(dispatcherProvider.io) {
         val configPath = envFetcher.get("UPDATE_CONFIG")
         if (configPath.isBlank()) {
             UpdateInfo()
@@ -38,11 +51,25 @@ class BackendUpdateFetcher(
         }
     }
 
-    suspend fun updateFile(): File = withContext(dispatcherProvider.io) {
+    suspend fun updateFile(): File {
+        updateFile?.let { return it }
+        updateFileMutex.withLock {
+            updateFile?.let { return it }
+            return updateFileInternal().apply { updateFile = this }
+        }
+    }
+
+    private suspend fun updateFileInternal(): File = withContext(dispatcherProvider.io) {
         val updateFilePath = envFetcher.get("UPDATE_FILE")
         if (updateFilePath.isBlank()) throw HttpException(HttpStatusCode.NotFound.value, "Update not found")
         val file = File(updateFilePath)
+        file.readChannel()
         if (!file.exists()) throw HttpException(HttpStatusCode.NotFound.value, "Update not exists")
         file
     }
+
+     private companion object {
+         var updateInfo: UpdateInfo? = null
+         var updateFile: File? = null
+     }
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/FuzzySearchFilter.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/FuzzySearchFilter.kt
index c1410c9..1e7d293 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/FuzzySearchFilter.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/FuzzySearchFilter.kt
@@ -49,6 +49,6 @@ class FuzzyMovieSearchFilter {
     }
 
     private companion object {
-        const val THRESHOLD = 55
+        const val THRESHOLD = 70
     }
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/RedisCacheStorage.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/RedisCacheStorage.kt
index 8c1a704..3c05afa 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/RedisCacheStorage.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/RedisCacheStorage.kt
@@ -3,7 +3,7 @@ package ru.shadowsparky.vbox.backend.data
 import io.lettuce.core.ExperimentalLettuceCoroutinesApi
 import io.lettuce.core.RedisClient
 import io.lettuce.core.SetArgs
-import io.lettuce.core.api.StatefulRedisConnection
+import io.lettuce.core.api.StatefulConnection
 import io.lettuce.core.api.coroutines
 import io.lettuce.core.api.coroutines.RedisCoroutinesCommands
 import kotlinx.coroutines.sync.Mutex
@@ -18,6 +18,7 @@ import ru.shadowsparky.domain.DispatcherProvider
 import ru.shadowsparky.vbox.backend.domain.CacheStorage
 import java.util.concurrent.ConcurrentHashMap
 import kotlin.time.Duration
+import kotlin.time.toJavaDuration
 
 @OptIn(ExperimentalLettuceCoroutinesApi::class)
 @Single
@@ -27,25 +28,23 @@ class RedisCacheStorage(
     private val json: Json
 ) : CacheStorage {
     private val logger = LoggerFactory.getLogger("RedisCacheStorage")
-
-    private var client: RedisClient? = null
-    private var connection: StatefulRedisConnection<String, String>? = null
-    private var commands: RedisCoroutinesCommands<String, String>? = null
+    private var session: Session? = null
     private val connectionMutex = Mutex()
+
     private val locks = ConcurrentHashMap<String, Mutex>()
 
     override suspend fun <T> getOrCreate(
         key: String,
         serializer: KSerializer<T>,
-        ttl: Duration?,
-        createNew: suspend () -> T,
+        ttl: Duration,
+        factory: suspend () -> T,
     ): T {
         read(key, serializer)?.let { return it }
         val mutex = locks.computeIfAbsent(key) { Mutex() }
         return mutex.withLock {
             try {
                 read(key, serializer)?.let { return@withLock it }
-                createNew().also {
+                factory().also {
                     write(key, it, serializer, ttl)
                 }
             } finally {
@@ -58,16 +57,11 @@ class RedisCacheStorage(
         key: String,
         value: T,
         serializer: KSerializer<T>,
-        duration: Duration? = null
+        duration: Duration
     ) {
-        val ttlInSeconds = duration?.inWholeSeconds
         val rawValue = json.encodeToString(serializer, value)
-        if (ttlInSeconds != null && ttlInSeconds > 0) {
-            val args = SetArgs().ex(ttlInSeconds)
-            getCommands().set(key, rawValue, args)
-        } else {
-            getCommands().set(key, rawValue)
-        }
+        val args = SetArgs().ex(duration.toJavaDuration())
+        getCommands().set(key, rawValue, args)
     }
 
     private suspend fun <T> read(key: String, serializer: KSerializer<T>): T? {
@@ -76,50 +70,40 @@ class RedisCacheStorage(
     }
 
     override suspend fun delete(key: String) {
-        (getCommands().del(key) ?: 0L) > 0L
+        getCommands().del(key)
     }
 
     override suspend fun close() {
         connectionMutex.withLock {
-            if (connection != null || client != null) {
+            session?.let {
                 logger.info("closing redis...")
-                try {
-                    connection?.close()
-                    client?.shutdown()
-                } catch (e: Exception) {
-                    logger.error("unable to close redis: ${e.message}", e)
-                } finally {
-                    connection = null
-                    client = null
-                    commands = null
+                runCatching {
+                    it.connection.close()
+                    it.client.shutdown()
                 }
+                session = null
             }
         }
     }
 
     private suspend fun getCommands(): RedisCoroutinesCommands<String, String> {
-        commands?.let { return it }
+        session?.commands?.let { return it }
         return connectionMutex.withLock {
-            commands?.let { return@withLock it }
+            session?.commands?.let { return@withLock it }
             withContext(dispatcherProvider.io) {
-                try {
-                    val redisUri = envFetcher.get("REDIS_URI", "redis://redis:6379")
-                    logger.info("Динамическое подключение к Redis: $redisUri")
-                    val redisClient = RedisClient.create(redisUri)
-                    val conn = redisClient.connect()
-                    val cmds = conn.coroutines()
-
-                    client = redisClient
-                    connection = conn
-                    commands = cmds
-
-                    logger.info("Успешно подключено к Redis")
-                    cmds
-                } catch (e: Exception) {
-                    logger.error("Ошибка динамического подключения к Redis: ${e.message}", e)
-                    throw e
+                val redisUri = envFetcher.get("REDIS_URI", "redis://redis:6379")
+                val redisClient = RedisClient.create(redisUri)
+                val conn = redisClient.connect()
+                conn.coroutines().apply {
+                    session = Session(redisClient, conn, this)
                 }
             }
         }
     }
+
+    private class Session(
+        val client: RedisClient,
+        val connection: StatefulConnection<String, String>,
+        val commands: RedisCoroutinesCommands<String, String>
+    )
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/domain/CacheStorage.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/domain/CacheStorage.kt
index 35a0125..78c42ce 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/domain/CacheStorage.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/domain/CacheStorage.kt
@@ -8,8 +8,8 @@ interface CacheStorage {
     suspend fun <T> getOrCreate(
         key: String,
         serializer: KSerializer<T>,
-        ttl: Duration? = null,
-        createNew: suspend () -> T,
+        ttl: Duration,
+        factory: suspend () -> T
     ): T
     suspend fun delete(key: String)
     suspend fun close()
@@ -18,12 +18,12 @@ interface CacheStorage {
 suspend inline fun <reified T> CacheStorage.getOrCreate(
     key: String,
     ttl: Duration,
-    noinline createNew: suspend () -> T,
+    noinline factory: suspend () -> T,
 ): T {
     return getOrCreate(
         key = key,
         serializer = serializer<T>(),
         ttl = ttl,
-        createNew = createNew
+        factory = factory
     )
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Jwt.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Jwt.kt
index f6f5e85..8af777c 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Jwt.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Jwt.kt
@@ -18,18 +18,16 @@ import ru.shadowsparky.vbox.shared.domain.model.ServerExceptionInfo
 
 const val AUTH_JWT_NAME = "auth-jwt"
 
-fun Application.configureJwt(authEntryPoint: AuthEntryPoint) {
+fun Application.configureJwt(authEntryPoint: AuthEntryPoint) = with(authEntryPoint) {
     install(Authentication) {
         jwt(AUTH_JWT_NAME) {
-            val jwtInfo = authEntryPoint.jwtInfo
             realm = jwtInfo.realm
-            verifier(authEntryPoint.tokenVerifier.verifier)
+            verifier(tokenVerifier.verifier)
             validate { credential ->
-                val tokenRepo = authEntryPoint.loginVerifier
                 val login = credential.payload.getClaim(LOGIN_NAME).asString()
                 try {
                     if (login != null) {
-                        tokenRepo.verify(login)
+                        loginVerifier.verify(login)
                         if (credential.payload.expiresAt == null) {
                             throw VerifyTokenException("Static tokens not supported!")
                         }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Serialization.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Serialization.kt
index bcd316d..89533f1 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Serialization.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Serialization.kt
@@ -4,9 +4,8 @@ import io.ktor.serialization.kotlinx.json.json
 import io.ktor.server.application.Application
 import io.ktor.server.application.install
 import io.ktor.server.plugins.contentnegotiation.ContentNegotiation
+import kotlinx.serialization.json.Json
 
-fun Application.configureSerialization() {
-    install(ContentNegotiation) {
-        json()
-    }
+fun Application.configureSerialization(json: Json) {
+    install(ContentNegotiation) { json(json) }
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/WebSocket.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/WebSocket.kt
index 54e3c13..f326110 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/WebSocket.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/WebSocket.kt
@@ -13,24 +13,19 @@ import io.ktor.server.websocket.webSocket
 import io.ktor.websocket.Frame
 import io.ktor.websocket.readText
 import kotlinx.coroutines.CompletableDeferred
-import kotlinx.coroutines.awaitCancellation
 import kotlinx.coroutines.channels.ReceiveChannel
 import kotlinx.coroutines.channels.SendChannel
 import kotlinx.serialization.json.Json
 import ru.shadowsparky.backend.data.TokenVerifier
+import ru.shadowsparky.http.domain.BadRequestException
 import ru.shadowsparky.http.domain.HttpException
 import ru.shadowsparky.vbox.backend.data.SessionRegistry
 import ru.shadowsparky.vbox.backend.data.eventLogger
 import ru.shadowsparky.vbox.backend.di.WebSocketEntryPoint
 import ru.shadowsparky.vbox.shared.domain.AuthRequest
 import ru.shadowsparky.vbox.shared.domain.AuthResponse
-import ru.shadowsparky.vbox.shared.domain.RecentlyWatchedRepository
 import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
-import ru.shadowsparky.vbox.shared.domain.SavedMovieRepository
-import ru.shadowsparky.vbox.shared.domain.SearchRepository
 import ru.shadowsparky.vbox.shared.domain.USER_ID_ARG
-import ru.shadowsparky.vbox.shared.domain.tag.MovieTagRepository
-import ru.shadowsparky.vbox.shared.domain.tag.UserTagRepository
 import kotlin.time.Duration.Companion.seconds
 
 fun Application.configureWebSocket(socketEntryPoint: WebSocketEntryPoint) = with(socketEntryPoint) {
@@ -41,15 +36,6 @@ fun Application.configureWebSocket(socketEntryPoint: WebSocketEntryPoint) = with
         masking = false
     }
     routing {
-        listOf(
-            "${SearchRepository.PREFIX}/onChange",
-            "${RecentlyWatchedRepository.PREFIX}/onChange",
-            "${SavedMovieRepository.PREFIX}/onChange",
-            "${UserTagRepository.PREFIX}/onChange",
-            "${MovieTagRepository.PREFIX}/onChange"
-        ).forEach {
-            webSocket(it) { awaitCancellation() }
-        }
         webSocket(RemoteEventHandler.ON_EVENT) {
             val userId = incoming.authFlow(json, tokenVerifier, outgoing)
             val session = SessionRegistry.Writer { text -> outgoing.trySend(Frame.Text(text)) }
@@ -75,7 +61,7 @@ private suspend fun ReceiveChannel<Frame>.authFlow(
     tokenVerifier: TokenVerifier,
     sendChannel: SendChannel<Frame>
 ): Long {
-    val rawRequest = receiveTextOrNull() ?: throw HttpException(HttpStatusCode.BadRequest)
+    val rawRequest = receiveTextOrNull() ?: throw BadRequestException("Authentication request required")
     val request = runCatching { json.decodeFromString<AuthRequest>(rawRequest) }.getOrNull()
     val decodedJwt = if (request == null) {
         tokenVerifier.verify(rawRequest)