diff --git a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/Bootstrap.java b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/Bootstrap.java
index 57d6f7d..fc14afe 100644
--- a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/Bootstrap.java
+++ b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/Bootstrap.java
@@ -69,7 +69,7 @@ public class Bootstrap {
     
     private static String getServerVersion() {
         try {
-            URL url = new URL(BASE_URL.replace("download?type=jar", "version"));
+            URL url = new URL(BASE_URL + "/launcher/version");
             HttpURLConnection conn = (HttpURLConnection) url.openConnection();
             conn.setRequestMethod("GET");
             if (conn.getResponseCode() == 200) {
diff --git a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/LauncherAPI.java b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/LauncherAPI.java
index 934f67c..89c2862 100644
--- a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/LauncherAPI.java
+++ b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/LauncherAPI.java
@@ -114,7 +114,7 @@ public class LauncherAPI {
                         }
                         idx = end;
                     }
-                    versions.sort((a, b) -> b.compareTo(a));
+                    versions.sort(LauncherAPI::compareVersions);
                     break;
                 case "neoforge":
                     String neoforgeXml = ZHttpClient.downloadString("https://maven.neoforged.net/releases/net/neoforged/neoforge/maven-metadata.xml");
@@ -129,7 +129,7 @@ public class LauncherAPI {
                         }
                         neoidx = end;
                     }
-                    versions.sort((a, b) -> b.compareTo(a));
+                    versions.sort(LauncherAPI::compareVersions);
                     break;
                 default:
                     break;
@@ -141,6 +141,23 @@ public class LauncherAPI {
         }
     }
     
+    private static int compareVersions(String a, String b) {
+        String[] partsA = a.split("\\.");
+        String[] partsB = b.split("\\.");
+        int len = Math.min(partsA.length, partsB.length);
+        for (int i = 0; i < len; i++) {
+            try {
+                int numA = Integer.parseInt(partsA[i]);
+                int numB = Integer.parseInt(partsB[i]);
+                if (numA != numB) return Integer.compare(numB, numA);
+            } catch (NumberFormatException e) {
+                int cmp = partsA[i].compareTo(partsB[i]);
+                if (cmp != 0) return cmp;
+            }
+        }
+        return Integer.compare(partsB.length, partsA.length);
+    }
+
     private boolean isNeoForgeCompatible(String version, String mcVersion) {
         if (mcVersion.startsWith("1.21")) {
             return version.contains("1.21") && !version.contains("1.20");
diff --git a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/auth/AuthService.java b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/auth/AuthService.java
index 4a49672..9fa3753 100644
--- a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/auth/AuthService.java
+++ b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/auth/AuthService.java
@@ -12,8 +12,10 @@ public class AuthService {
 
     public ApiResponse<LoginResult> register(String username, String password) {
         try {
-            String response = post("/auth/register",
-                    "{\"username\":\"" + username + "\",\"password\":\"" + password + "\"}");
+            JsonObject json = new JsonObject();
+            json.addProperty("username", username);
+            json.addProperty("password", password);
+            String response = post("/auth/register", json.toString());
             
             // If registration succeeds, auto-login
             AuthManager.AuthResult result = AuthManager.login(username, password);
@@ -74,8 +76,9 @@ public class AuthService {
 
     public ApiResponse<Boolean> activatePass(String passCode) {
         try {
-            String response = post("/auth/pass/activate",
-                    "{\"pass_code\":\"" + passCode + "\"}");
+            JsonObject json = new JsonObject();
+            json.addProperty("pass_code", passCode);
+            String response = post("/auth/pass/activate", json.toString());
             AuthManager.refreshUserInfo();
             return ApiResponse.success(true);
         } catch (Exception e) {
diff --git a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/launch/LaunchService.java b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/launch/LaunchService.java
index 8a4e695..01969dc 100644
--- a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/launch/LaunchService.java
+++ b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/launch/LaunchService.java
@@ -186,7 +186,7 @@ public class LaunchService {
         }
         String args = Config.getExtraJvmArgs();
         if (args != null && !args.isEmpty()) {
-            for (String arg : args.split("\\s+")) {
+            for (String arg : args.split("\n")) {
                 arg = arg.trim();
                 if (!arg.isEmpty()) extraArgs.add(arg);
             }
diff --git a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/auth/AuthManager.java b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/auth/AuthManager.java
index c568fcd..0096529 100644
--- a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/auth/AuthManager.java
+++ b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/auth/AuthManager.java
@@ -123,12 +123,18 @@ public class AuthManager {
     public static void logout() {
         if (session != null && session.refreshToken != null) {
             try {
-                post("/auth/logout", "{\"refresh_token\":\"" + session.refreshToken + "\"}");
-            } catch (Exception ignored) {}
+                JsonObject json = new JsonObject();
+                json.addProperty("refresh_token", session.refreshToken);
+                post("/auth/logout", json.toString());
+            } catch (Exception e) {
+                LauncherLogger.warn("Logout error: " + e.getMessage());
+            }
         }
         session = null;
         userInfo = null;
-        try { Files.deleteIfExists(AUTH_FILE); } catch (Exception ignored) {}
+        try { Files.deleteIfExists(AUTH_FILE); } catch (Exception e) {
+            LauncherLogger.warn("Failed to delete auth.json: " + e.getMessage());
+        }
     }
 
     public static boolean isLoggedIn() {
@@ -140,23 +146,28 @@ public class AuthManager {
     }
 
     public static String getUsername() {
-        return session != null ? session.username : "Player";
+        AuthSession localSession = session;
+        return localSession != null ? localSession.username : "Player";
     }
 
     public static String getUuid() {
-        return session != null ? session.uuid : "00000000-0000-0000-0000-000000000000";
+        AuthSession localSession = session;
+        return localSession != null ? localSession.uuid : "00000000-0000-0000-0000-000000000000";
     }
 
     public static String getAccessToken() {
-        if (session == null) return "0";
+        AuthSession localSession = session;
+        if (localSession == null) return "0";
         if (isAccessTokenExpired()) {
             boolean refreshed = tryRefresh();
             if (!refreshed) {
-                if (session == null) return "0";
-                return session.accessToken != null ? session.accessToken : "0";
+                localSession = session;
+                if (localSession == null) return "0";
+                return localSession.accessToken != null ? localSession.accessToken : "0";
             }
         }
-        return session != null && session.accessToken != null ? session.accessToken : "0";
+        localSession = session;
+        return localSession != null && localSession.accessToken != null ? localSession.accessToken : "0";
     }
 
     private static boolean isAccessTokenExpired() {
@@ -174,8 +185,9 @@ public class AuthManager {
             return false;
         }
         try {
-            String body = "{\"refresh_token\":\"" + session.refreshToken + "\"}";
-            SimpleHttpResponse resp = post("/auth/refresh", body);
+            JsonObject json = new JsonObject();
+            json.addProperty("refresh_token", session.refreshToken);
+            SimpleHttpResponse resp = post("/auth/refresh", json.toString());
 
             if (resp.statusCode() == 200) {
                 AuthSession newSession = GSON.fromJson(resp.body(), AuthSession.class);
diff --git a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/MinecraftLib.java b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/MinecraftLib.java
index c22effd..0219bf9 100644
--- a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/MinecraftLib.java
+++ b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/MinecraftLib.java
@@ -8,6 +8,7 @@ import me.sashegdev.zernmc.launcher.minecraft.launch.LaunchCommandBuilder;
 import me.sashegdev.zernmc.launcher.minecraft.model.LaunchOptions;
 import me.sashegdev.zernmc.launcher.ui.jfx.JFXLauncher;
 import me.sashegdev.zernmc.launcher.utils.ConsoleUtils;
+import me.sashegdev.zernmc.launcher.utils.LauncherLogger;
 import me.sashegdev.zernmc.launcher.utils.ZAnsi;
 
 import java.io.BufferedReader;
@@ -160,14 +161,15 @@ public class MinecraftLib {
     }
 
     private void safeDeleteDirectory(Path dir) {
-        try {
-            Files.walk(dir)
-                 .sorted((a, b) -> b.compareTo(a))
-                 .forEach(p -> {
-                     try { Files.deleteIfExists(p); } 
-                     catch (IOException ignored) {}
-                 });
-        } catch (IOException ignored) {}
+        try (var stream = Files.walk(dir)) {
+            stream.sorted((a, b) -> b.compareTo(a))
+                  .forEach(p -> {
+                      try { Files.deleteIfExists(p); } 
+                      catch (IOException e) { /* ignore */ }
+                  });
+        } catch (IOException e) {
+            LauncherLogger.warn("safeDeleteDirectory: " + e.getMessage());
+        }
     }
 
     private void deleteOldVersionDirs(Path versionsDir, String keepVersion) throws IOException {
diff --git a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/PackDownloader.java b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/PackDownloader.java
index fae0515..fac176f 100644
--- a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/PackDownloader.java
+++ b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/PackDownloader.java
@@ -20,6 +20,7 @@ import java.net.http.HttpResponse;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.security.MessageDigest;
+import java.time.Duration;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.*;
@@ -464,12 +465,19 @@ public class PackDownloader {
      */
     private void downloadFile(FileInfo file, Path destination) throws Exception {
         String url = ZHttpClient.getBaseUrl() + file.getUrl();
+        String accessToken = AuthManager.getAccessToken();
         
-        HttpRequest request = HttpRequest.newBuilder()
+        HttpRequest.Builder builder = HttpRequest.newBuilder()
             .uri(java.net.URI.create(url))
-            .GET()
-            .build();
+            .timeout(Duration.ofSeconds(60))
+            .header("User-Agent", "ZernMC-Launcher/1.0")
+            .GET();
         
+        if (accessToken != null && !accessToken.equals("0")) {
+            builder.header("Authorization", "Bearer " + accessToken);
+        }
+        
+        HttpRequest request = builder.build();
         HttpResponse<InputStream> response = httpClient.send(request,
             HttpResponse.BodyHandlers.ofInputStream());
         
diff --git a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/installer/ForgeInstaller.java b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/installer/ForgeInstaller.java
index bdb4942..e728b0e 100644
--- a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/installer/ForgeInstaller.java
+++ b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/installer/ForgeInstaller.java
@@ -11,7 +11,9 @@ import java.net.http.HttpResponse;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.StandardOpenOption;
+import java.util.Arrays;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 public class ForgeInstaller {
@@ -240,29 +242,35 @@ public class ForgeInstaller {
         System.out.println(ZAnsi.cyan("Checking and downloading missing libraries..."));
         
         // List of problematic libraries and their alternate URLs
-        Map<String, String> alternativeUrls = new HashMap<>();
-        alternativeUrls.put("org/ow2/asm/asm/9.6/asm-9.6.jar", 
-            "https://repo1.maven.org/maven2/org/ow2/asm/asm/9.6/asm-9.6.jar");
-        alternativeUrls.put("org/ow2/asm/asm/9.6/asm-9.6.jar",
-            "https://mirrors.huaweicloud.com/repository/maven/org/ow2/asm/asm/9.6/asm-9.6.jar");
-        
         Path librariesDir = instance.getPath().resolve("libraries");
         
-        for (Map.Entry<String, String> entry : alternativeUrls.entrySet()) {
+        // Map from maven path to list of mirror URLs (tried in order)
+        Map<String, List<String>> alternativeUrls = new HashMap<>();
+        alternativeUrls.put("org/ow2/asm/asm/9.6/asm-9.6.jar", Arrays.asList(
+            "https://repo1.maven.org/maven2/org/ow2/asm/asm/9.6/asm-9.6.jar",
+            "https://mirrors.huaweicloud.com/repository/maven/org/ow2/asm/asm/9.6/asm-9.6.jar"
+        ));
+        
+        for (Map.Entry<String, List<String>> entry : alternativeUrls.entrySet()) {
             Path target = librariesDir.resolve(entry.getKey());
             if (!Files.exists(target)) {
                 Files.createDirectories(target.getParent());
                 System.out.println(ZAnsi.yellow("Downloading: " + target.getFileName()));
                 
-                for (int attempt = 1; attempt <= 3; attempt++) {
-                    try {
-                        downloadFileWithProgress(entry.getValue(), target);
-                        break;
-                    } catch (Exception e) {
-                        if (attempt == 3) throw e;
-                        System.out.println(ZAnsi.yellow("Повторная попытка " + attempt + "/3..."));
-                        Thread.sleep(2000);
+                boolean downloaded = false;
+                for (String mirrorUrl : entry.getValue()) {
+                    for (int attempt = 1; attempt <= 3; attempt++) {
+                        try {
+                            downloadFileWithProgress(mirrorUrl, target);
+                            downloaded = true;
+                            break;
+                        } catch (Exception e) {
+                            if (attempt == 3 && mirrorUrl.equals(entry.getValue().get(entry.getValue().size() - 1))) throw e;
+                            System.out.println(ZAnsi.yellow("Retry " + attempt + "/3..."));
+                            try { Thread.sleep(2000); } catch (InterruptedException ignored) {}
+                        }
                     }
+                    if (downloaded) break;
                 }
             }
         }
diff --git a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/installer/VersionInstaller.java b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/installer/VersionInstaller.java
index f28a61a..83f7b15 100644
--- a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/installer/VersionInstaller.java
+++ b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/installer/VersionInstaller.java
@@ -183,6 +183,7 @@ public class VersionInstaller {
         }
 
         CompletableFuture.allOf(futures.toArray(new CompletableFuture[0])).join();
+        executor.shutdown();
 
         ProgressBar.finish("Assets downloaded (" + success[0] + " ok, " + failed[0] + " skipped)");
 
diff --git a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/utils/Config.java b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/utils/Config.java
index 737e61a..84102a0 100644
--- a/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/utils/Config.java
+++ b/launcher/launcher/src/main/java/sashegdev/zernmc/launcher/utils/Config.java
@@ -41,12 +41,24 @@ public class Config {
                 }
             }
 
-            maxMemory = Integer.parseInt(props.getProperty("maxMemory", "4096"));
+            try {
+                maxMemory = Integer.parseInt(props.getProperty("maxMemory", "4096"));
+            } catch (NumberFormatException e) {
+                System.err.println(ZAnsi.yellow("Config: invalid maxMemory value, using default"));
+            }
             ramManuallySet = Boolean.parseBoolean(props.getProperty("ramManuallySet", "false"));
             serverUrl = props.getProperty("serverUrl", serverUrl);
             lastUsername = props.getProperty("lastUsername", lastUsername);
-            windowWidth = Integer.parseInt(props.getProperty("windowWidth", "1280"));
-            windowHeight = Integer.parseInt(props.getProperty("windowHeight", "720"));
+            try {
+                windowWidth = Integer.parseInt(props.getProperty("windowWidth", "1280"));
+            } catch (NumberFormatException e) {
+                System.err.println(ZAnsi.yellow("Config: invalid windowWidth value, using default"));
+            }
+            try {
+                windowHeight = Integer.parseInt(props.getProperty("windowHeight", "720"));
+            } catch (NumberFormatException e) {
+                System.err.println(ZAnsi.yellow("Config: invalid windowHeight value, using default"));
+            }
             extraJvmArgs = props.getProperty("extraJvmArgs", "");
             javaPath = props.getProperty("javaPath", "java");
             locale = props.getProperty("locale", "en");
@@ -235,7 +247,6 @@ public class Config {
         StringBuilder sb = new StringBuilder();
         sb.append("-XX:ParallelGCThreads=").append(Math.max(1, cores));
         sb.append(" -XX:ConcGCThreads=").append(Math.max(1, cores / 2));
-        sb.append(" -XX:+UseContainerSupport");
         sb.append(" -XX:+AlwaysPreTouch");
         if (ramMB >= 8192) {
             sb.append(" -XX:+UseZGC");
diff --git a/server/admin_router.py b/server/admin_router.py
index 899e5c1..c367ac6 100644
--- a/server/admin_router.py
+++ b/server/admin_router.py
@@ -60,8 +60,8 @@ async def list_users(
             query += " FROM users"
         
         if search:
-            query += " AND (username LIKE ? OR email LIKE ?)"
-            params.extend([f"%{search}%", f"%{search}%"])
+            query += " AND username LIKE ?"
+            params.append(f"%{search}%")
         
         query += " ORDER BY role DESC, username"
         
@@ -108,19 +108,13 @@ async def get_user_detail(
     """Детальная информация о пользователе"""
     with get_db() as conn:
         row = conn.execute("""
-            SELECT id, username, email, uuid, role, created_at, last_login, is_active, banned_until
+            SELECT id, username, uuid, role, created_at, last_login, is_active, banned_until
             FROM users WHERE id = ?
         """, (user_id,)).fetchone()
         
         if not row:
             raise HTTPException(404, "Пользователь не найден")
         
-        # Модераторы не видят email обычных пользователей
-        if current_user["role"] < ROLE_ELDER and row["role"] < ROLE_MODERATOR:
-            email = None
-        else:
-            email = row["email"]
-        
         # Получаем активную проходку
         pass_info = None
         if row["role"] >= ROLE_PASS_HOLDER or current_user["role"] >= ROLE_ELDER:
@@ -151,7 +145,6 @@ async def get_user_detail(
         return {
             "id": row["id"],
             "username": row["username"],
-            "email": email,
             "uuid": row["uuid"],
             "role": row["role"],
             "role_name": ROLE_NAMES.get(row["role"], "Неизвестно"),
diff --git a/server/friends.py b/server/friends.py
index 173c748..67f7b95 100644
--- a/server/friends.py
+++ b/server/friends.py
@@ -135,7 +135,7 @@ async def list_friends(current_user: dict = Depends(get_current_user)):
                 "role": row[2],
                 "online": bool(row[3]),
                 "current_pack": row[4],
-                "last_seen": row[5].isoformat() if row[5] else None
+                "last_seen": row[5] if row[5] else None
             })
 
     return {"friends": friends}
@@ -155,7 +155,7 @@ async def list_friend_requests(current_user: dict = Depends(get_current_user)):
                 "id": row[0],
                 "username": row[1],
                 "role": row[2],
-                "created_at": row[3].isoformat() if row[3] else None
+                "created_at": row[3] if row[3] else None
             })
     return {"requests": requests}
 
diff --git a/server/main.py b/server/main.py
index 48f1c72..839288f 100644
--- a/server/main.py
+++ b/server/main.py
@@ -647,18 +647,12 @@ class CacheControlMiddleware:
             await self.app(scope, receive, send)
             return
 
-        # Add caching headers for static files
         async def send_wrapper(status, headers, *args, **kwargs):
-            # Add cache headers for static files
-            cache_headers = [
-                (b"cache-control", b"public, max-age=86400"),  # 24 hours
-                (b"etag", b'"file-etag"'),
-            ]
+            cache_headers = [(b"cache-control", b"public, max-age=86400")]
             headers = list(headers) + cache_headers
             await send(status, headers, *args, **kwargs)
 
-        # Use original send
-        await self.app(scope, receive, send)
+        await self.app(scope, receive, send_wrapper)
 
 
 app.add_middleware(CacheControlMiddleware)
@@ -962,7 +956,7 @@ async def get_pack_diff(
 
 
 @app.get("/pack/{pack_name}")
-async def get_pack_manifest(pack_name: str, request: Request):
+async def get_pack_manifest(pack_name: str, request: Request, current_user: dict = Depends(get_current_user)):
     """Get pack manifest with caching"""
     client_ip = request.client.host if request.client else "unknown"
     
@@ -1009,7 +1003,12 @@ async def get_pack_file(pack_name: str, file_path: str, request: Request):
     client_ip = request.client.host if request.client else None
     
     # Security: prevent path traversal
-    if ".." in file_path:
+    try:
+        full_path = full_path.resolve()
+        pack_root = (PACKS_DIR / pack_name).resolve()
+        if not str(full_path).startswith(str(pack_root)):
+            raise HTTPException(403, "Invalid file path")
+    except (ValueError, OSError):
         raise HTTPException(403, "Invalid file path")
     
     if not full_path.exists() or not full_path.is_file():
@@ -1461,28 +1460,6 @@ async def download_legacy_launcher():
     raise HTTPException(404, "No legacy launcher files available")
 
 
-@app.get("/launcher/download/zip/{filename}")
-async def download_launcher_zip(filename: str):
-    """Download specific launcher ZIP archive"""
-    if ".." in filename:
-        raise HTTPException(400, "Invalid filename")
-    
-    valid_patterns = ["ZernMCLauncher-", "ZernMC-win-"]
-    if not any(filename.startswith(p) for p in valid_patterns) or not filename.endswith(".zip"):
-        raise HTTPException(400, "Invalid filename")
-    
-    file_path = BUILDS_DIR / filename
-    
-    if not file_path.exists():
-        raise HTTPException(404, "ZIP file not found")
-    
-    return FileResponse(
-        path=file_path,
-        filename=filename,
-        media_type="application/zip"
-    )
-
-
 # ====================== ЛАУНЧЕР МЕТА ЭНДПОИНТЫ ======================
 
 @app.get("/launcher/meta")
diff --git a/server/pack_manager.py b/server/pack_manager.py
index 584321c..8002803 100644
--- a/server/pack_manager.py
+++ b/server/pack_manager.py
@@ -5,6 +5,8 @@ from pathlib import Path
 import json
 from typing import Optional, Dict
 import structlog
+import asyncio
+import aiofiles
 
 from models import PackMeta, FileEntry
 
@@ -33,9 +35,9 @@ def calculate_sha256_sync(file_path: Path) -> str:
     return hash_sha.hexdigest()
 
 async def calculate_sha256(file_path: Path) -> str:
-    """Calculate SHA256 hash of a file (async wrapper)"""
-    # Используем синхронную версию для простоты
-    return calculate_sha256_sync(file_path)
+    """Calculate SHA256 hash of a file (async)"""
+    loop = asyncio.get_running_loop()
+    return await loop.run_in_executor(None, calculate_sha256_sync, file_path)
 
 async def scan_pack(pack_name: str, force_rescan: bool = False) -> PackMeta:
     """Scan pack directory and update manifest if needed"""
@@ -51,11 +53,11 @@ async def scan_pack(pack_name: str, force_rescan: bool = False) -> PackMeta:
     if not force_rescan and pack_name in _manifest_cache:
         return _manifest_cache[pack_name]
 
-    # Load existing meta if available (синхронно)
+    # Load existing meta if available
     if meta_path.exists():
         try:
-            with open(meta_path, 'r', encoding='utf-8') as f:
-                data = json.load(f)
+            async with aiofiles.open(meta_path, 'r', encoding='utf-8') as f:
+                data = json.loads(await f.read())
                 current_meta = PackMeta.model_validate(data)
         except Exception as e:
             logger.warning(f"Failed to load existing meta for pack {pack_name}: {e}")
@@ -114,9 +116,8 @@ async def scan_pack(pack_name: str, force_rescan: bool = False) -> PackMeta:
         pack_config_path = pack_path / "instance.json"
         if pack_config_path.exists():
             try:
-                # Синхронное чтение конфига
-                with open(pack_config_path, 'r', encoding='utf-8') as f:
-                    config = json.load(f)
+                async with aiofiles.open(pack_config_path, 'r', encoding='utf-8') as f:
+                    config = json.loads(await f.read())
                     minecraft_version = config.get("minecraftVersion", minecraft_version)
                     loader_type = config.get("loaderType", loader_type)
                     loader_version = config.get("loaderVersion")
@@ -137,9 +138,8 @@ async def scan_pack(pack_name: str, force_rescan: bool = False) -> PackMeta:
             asset_index=asset_index
         )
         
-        # Save to disk (синхронно)
-        with open(meta_path, 'w', encoding='utf-8') as f:
-            f.write(new_meta.model_dump_json(indent=2))
+        async with aiofiles.open(meta_path, 'w', encoding='utf-8') as f:
+            await f.write(new_meta.model_dump_json(indent=2))
         
         # Update cache
         _manifest_cache[pack_name] = new_meta
diff --git a/server/playtime.py b/server/playtime.py
index 2b3aca9..d988eb9 100644
--- a/server/playtime.py
+++ b/server/playtime.py
@@ -37,7 +37,7 @@ async def sync_playtime(
     with get_db() as conn:
         cursor = conn.execute(
             "SELECT id, minutes FROM playtime WHERE user_id = ? AND pack_name = ?",
-            (current_user["user_id"], req.pack_name)
+            (current_user["id"], req.pack_name)
         )
         existing = cursor.fetchone()
         if existing: