diff --git a/SECURITY_REFACTOR_PLAN.md b/SECURITY_REFACTOR_PLAN.md
deleted file mode 100644
index 55e621cc..00000000
--- a/SECURITY_REFACTOR_PLAN.md
+++ /dev/null
@@ -1,94 +0,0 @@
-# Termix 安全重构计划
-
-## 现状分析
-- 当前所有密钥都用base64编码存储在数据库
-- JWT Secret和数据加密密钥混合管理
-- 没有真正的KEK-DEK分离
-- 数据库文件泄露 = 完全沦陷
-
-## 目标架构
-
-### 密钥层次
-```
-用户密码 → KEK → DEK → 字段加密密钥 → 数据
-系统启动 → JWT Secret → JWT Token → API认证
-```
-
-### 存储分离
-```
-系统级：settings.system_jwt_secret (base64保护)
-用户级：settings.user_kek_salt_${userId}
-用户级：settings.user_encrypted_dek_${userId} (KEK保护)
-```
-
-## 修复步骤
-
-### 第1步：新建分离的密钥管理类
-- [ ] 创建 SystemKeyManager (JWT密钥)
-- [ ] 创建 UserKeyManager (用户数据密钥)
-- [ ] 创建 SecuritySession (会话管理)
-
-### 第2步：重构认证流程
-- [ ] 修改用户注册：生成用户专属KEK salt和DEK
-- [ ] 修改用户登录：验证密码 + 解锁数据密钥
-- [ ] 修改JWT验证：系统密钥验证 + 用户会话检查
-
-### 第3步：重构数据加密
-- [ ] 分离数据加密和JWT密钥初始化
-- [ ] 修改EncryptedDBOperations使用用户会话密钥
-- [ ] 添加会话过期处理
-
-### 第4步：数据库迁移
-- [ ] 创建迁移脚本：现有数据 → KEK保护
-- [ ] 向后兼容处理
-- [ ] 安全删除旧密钥
-
-### 第5步：API修改
-- [ ] 添加用户密码验证接口
-- [ ] 修改所有加密相关接口
-- [ ] 添加会话管理接口
-
-## 文件修改清单
-
-### 新建文件
-- src/backend/utils/system-key-manager.ts
-- src/backend/utils/user-key-manager.ts
-- src/backend/utils/security-session.ts
-- src/backend/utils/security-migration.ts
-
-### 修改文件
-- src/backend/utils/encryption-key-manager.ts (简化或删除)
-- src/backend/utils/database-encryption.ts
-- src/backend/utils/encrypted-db-operations.ts
-- src/backend/database/routes/users.ts
-- src/backend/database/database.ts
-
-### 数据库Schema
-- 新增：user_kek_salt_${userId}
-- 新增：user_encrypted_dek_${userId}
-- 修改：system_jwt_secret (从current混合模式分离)
-
-## 安全考虑
-
-### 密钥生命周期
-- JWT Secret: 应用生命周期
-- 用户KEK: 永不存储，从密码推导
-- 用户DEK: 会话期间，内存存储
-- 字段密钥: 临时推导，立即销毁
-
-### 会话管理
-- 数据会话独立于JWT有效期
-- 非活跃自动过期
-- 用户登出立即清理
-
-### 向后兼容
-- 检测旧格式数据
-- 用户登录时自动迁移
-- 迁移完成后删除旧密钥
-
-## 测试计划
-- [ ] 密钥生成和推导测试
-- [ ] 加密解密正确性测试
-- [ ] 会话管理测试
-- [ ] 迁移流程测试
-- [ ] 性能影响评估
\ No newline at end of file
diff --git a/src/backend/database/database.ts b/src/backend/database/database.ts
index de856aab..5da60d4f 100644
--- a/src/backend/database/database.ts
+++ b/src/backend/database/database.ts
@@ -13,7 +13,6 @@ import "dotenv/config";
 import { databaseLogger, apiLogger } from "../utils/logger.js";
 import { SecuritySession } from "../utils/security-session.js";
 import { DatabaseEncryption } from "../utils/database-encryption.js";
-import { SecurityMigration } from "../utils/security-migration.js";
 import { DatabaseFileEncryption } from "../utils/database-file-encryption.js";
 
 const app = express();
@@ -294,11 +293,9 @@ app.get("/encryption/status", async (req, res) => {
   try {
     const securitySession = SecuritySession.getInstance();
     const securityStatus = await securitySession.getSecurityStatus();
-    const migrationStatus = await SecurityMigration.checkMigrationStatus();
 
     res.json({
       security: securityStatus,
-      migration: migrationStatus,
       version: "v2-kek-dek",
     });
   } catch (error) {
@@ -337,47 +334,6 @@ app.post("/encryption/initialize", async (req, res) => {
   }
 });
 
-app.post("/encryption/migrate", async (req, res) => {
-  try {
-    const { dryRun = false } = req.body;
-
-    const migration = new SecurityMigration({
-      dryRun,
-      backupEnabled: true,
-    });
-
-    if (dryRun) {
-      apiLogger.info("Starting encryption migration (dry run)", {
-        operation: "encryption_migrate_dry_run",
-      });
-
-      res.json({
-        success: true,
-        message: "Dry run mode - no changes made",
-        dryRun: true,
-      });
-    } else {
-      apiLogger.info("Starting encryption migration", {
-        operation: "encryption_migrate",
-      });
-
-      await migration.runMigration();
-
-      res.json({
-        success: true,
-        message: "Migration completed successfully",
-      });
-    }
-  } catch (error) {
-    apiLogger.error("Migration failed", error, {
-      operation: "encryption_migrate_failed",
-    });
-    res.status(500).json({
-      error: "Migration failed",
-      details: error instanceof Error ? error.message : "Unknown error",
-    });
-  }
-});
 
 app.post("/encryption/regenerate", async (req, res) => {
   try {
@@ -654,7 +610,6 @@ app.listen(PORT, async () => {
       "/releases/rss",
       "/encryption/status",
       "/encryption/initialize",
-      "/encryption/migrate",
       "/encryption/regenerate",
       "/database/export",
       "/database/import",
diff --git a/src/backend/database/routes/users.ts b/src/backend/database/routes/users.ts
index 6a895584..dd338101 100644
--- a/src/backend/database/routes/users.ts
+++ b/src/backend/database/routes/users.ts
@@ -7,6 +7,7 @@ import {
   fileManagerPinned,
   fileManagerShortcuts,
   dismissedAlerts,
+  settings,
 } from "../db/schema.js";
 import { eq, and } from "drizzle-orm";
 import bcrypt from "bcryptjs";
@@ -18,7 +19,6 @@ import type { Request, Response, NextFunction } from "express";
 import { authLogger, apiLogger } from "../../utils/logger.js";
 import { SecuritySession } from "../../utils/security-session.js";
 import { UserKeyManager } from "../../utils/user-key-manager.js";
-import { SecurityMigration } from "../../utils/security-migration.js";
 
 // Get security session instance
 const securitySession = SecuritySession.getInstance();
@@ -785,24 +785,29 @@ router.post("/login", async (req, res) => {
       return res.status(401).json({ error: "Incorrect password" });
     }
 
-    // Check and handle user migration (from old encryption system)
-    let migrationPerformed = false;
+    // Check if legacy user needs encryption setup
     try {
-      migrationPerformed = await SecurityMigration.handleUserLoginMigration(userRecord.id, password);
-      if (migrationPerformed) {
-        authLogger.success("User encryption migrated during login", {
-          operation: "login_migration_success",
+      const kekSalt = await db
+        .select()
+        .from(settings)
+        .where(eq(settings.key, `user_kek_salt_${userRecord.id}`));
+
+      if (kekSalt.length === 0) {
+        // Legacy user first login - set up new encryption
+        await securitySession.registerUser(userRecord.id, password);
+        authLogger.success("Legacy user encryption initialized", {
+          operation: "legacy_user_setup",
           username,
           userId: userRecord.id,
         });
       }
-    } catch (migrationError) {
-      authLogger.error("Failed to migrate user during login", migrationError, {
-        operation: "login_migration_failed",
+    } catch (setupError) {
+      authLogger.error("Failed to initialize user encryption", setupError, {
+        operation: "user_encryption_setup_failed",
         username,
         userId: userRecord.id,
       });
-      // Migration failure should not block login, but needs to be logged
+      // Encryption setup failure should not block login for existing users
     }
 
     // Unlock user data keys
diff --git a/src/backend/utils/security-migration.ts b/src/backend/utils/security-migration.ts
deleted file mode 100644
index 422d8937..00000000
--- a/src/backend/utils/security-migration.ts
+++ /dev/null
@@ -1,449 +0,0 @@
-#!/usr/bin/env node
-import { db } from "../database/db/index.js";
-import { settings, users, sshData, sshCredentials } from "../database/db/schema.js";
-import { eq, sql } from "drizzle-orm";
-import { SecuritySession } from "./security-session.js";
-import { UserKeyManager } from "./user-key-manager.js";
-import { DatabaseEncryption } from "./database-encryption.js";
-import { EncryptedDBOperations } from "./encrypted-db-operations.js";
-import { FieldEncryption } from "./encryption.js";
-import { databaseLogger } from "./logger.js";
-
-interface MigrationConfig {
-  dryRun?: boolean;
-  backupEnabled?: boolean;
-  forceRegeneration?: boolean;
-}
-
-interface MigrationResult {
-  success: boolean;
-  usersProcessed: number;
-  recordsMigrated: number;
-  errors: string[];
-  warnings: string[];
-}
-
-/**
- * SecurityMigration - Migrate from old encryption system to KEK-DEK architecture
- *
- * Migration steps:
- * 1. Detect existing system state
- * 2. Backup existing data
- * 3. Initialize new security system
- * 4. Set up KEK-DEK for existing users
- * 5. Migrate encrypted data
- * 6. Clean up old keys
- */
-class SecurityMigration {
-  private config: MigrationConfig;
-  private securitySession: SecuritySession;
-  private userKeyManager: UserKeyManager;
-
-  constructor(config: MigrationConfig = {}) {
-    this.config = {
-      dryRun: config.dryRun ?? false,
-      backupEnabled: config.backupEnabled ?? true,
-      forceRegeneration: config.forceRegeneration ?? false,
-    };
-
-    this.securitySession = SecuritySession.getInstance();
-    this.userKeyManager = UserKeyManager.getInstance();
-  }
-
-  /**
-   * Run complete migration
-   */
-  async runMigration(): Promise<MigrationResult> {
-    const result: MigrationResult = {
-      success: false,
-      usersProcessed: 0,
-      recordsMigrated: 0,
-      errors: [],
-      warnings: [],
-    };
-
-    try {
-      databaseLogger.info("Starting security migration to KEK-DEK architecture", {
-        operation: "security_migration_start",
-        dryRun: this.config.dryRun,
-        backupEnabled: this.config.backupEnabled,
-      });
-
-      // 1. Check migration prerequisites
-      await this.validatePrerequisites();
-
-      // 2. Create backup
-      if (this.config.backupEnabled && !this.config.dryRun) {
-        await this.createBackup();
-      }
-
-      // 3. Initialize new security system
-      await this.initializeNewSecurity();
-
-      // 4. Detect users needing migration
-      const usersToMigrate = await this.detectUsersNeedingMigration();
-      result.warnings.push(`Found ${usersToMigrate.length} users that need migration`);
-
-      // 5. Process each user
-      for (const user of usersToMigrate) {
-        try {
-          await this.migrateUser(user, result);
-          result.usersProcessed++;
-        } catch (error) {
-          const errorMsg = `Failed to migrate user ${user.username}: ${error instanceof Error ? error.message : 'Unknown error'}`;
-          result.errors.push(errorMsg);
-          databaseLogger.error("User migration failed", error, {
-            operation: "user_migration_failed",
-            userId: user.id,
-            username: user.username,
-          });
-        }
-      }
-
-      // 6. Clean up old system (if all users migrated successfully)
-      if (result.errors.length === 0 && !this.config.dryRun) {
-        await this.cleanupOldSystem();
-      }
-
-      result.success = result.errors.length === 0;
-
-      databaseLogger.success("Security migration completed", {
-        operation: "security_migration_complete",
-        result,
-      });
-
-      return result;
-
-    } catch (error) {
-      const errorMsg = `Migration failed: ${error instanceof Error ? error.message : 'Unknown error'}`;
-      result.errors.push(errorMsg);
-      databaseLogger.error("Security migration failed", error, {
-        operation: "security_migration_failed",
-      });
-      return result;
-    }
-  }
-
-  /**
-   * Validate migration prerequisites
-   */
-  private async validatePrerequisites(): Promise<void> {
-    databaseLogger.info("Validating migration prerequisites", {
-      operation: "migration_validation",
-    });
-
-    // Check database connection
-    try {
-      await db.select().from(settings).limit(1);
-    } catch (error) {
-      throw new Error("Database connection failed");
-    }
-
-    // Check for old encryption keys
-    const oldEncryptionKey = await db
-      .select()
-      .from(settings)
-      .where(eq(settings.key, "db_encryption_key"));
-
-    if (oldEncryptionKey.length === 0) {
-      databaseLogger.info("No old encryption key found - fresh installation", {
-        operation: "migration_validation",
-      });
-    } else {
-      databaseLogger.info("Old encryption key detected - migration needed", {
-        operation: "migration_validation",
-      });
-    }
-
-    databaseLogger.success("Prerequisites validation passed", {
-      operation: "migration_validation_complete",
-    });
-  }
-
-  /**
-   * Create pre-migration backup
-   */
-  private async createBackup(): Promise<void> {
-    databaseLogger.info("Creating migration backup", {
-      operation: "migration_backup",
-    });
-
-    try {
-      const fs = await import("fs");
-      const path = await import("path");
-      const dataDir = process.env.DATA_DIR || "./db/data";
-      const dbPath = path.join(dataDir, "db.sqlite");
-      const backupPath = path.join(dataDir, `migration-backup-${Date.now()}.sqlite`);
-
-      if (fs.existsSync(dbPath)) {
-        fs.copyFileSync(dbPath, backupPath);
-        databaseLogger.success(`Migration backup created: ${backupPath}`, {
-          operation: "migration_backup_complete",
-          backupPath,
-        });
-      }
-    } catch (error) {
-      databaseLogger.error("Failed to create migration backup", error, {
-        operation: "migration_backup_failed",
-      });
-      throw error;
-    }
-  }
-
-  /**
-   * Initialize new security system
-   */
-  private async initializeNewSecurity(): Promise<void> {
-    databaseLogger.info("Initializing new security system", {
-      operation: "new_security_init",
-    });
-
-    await this.securitySession.initialize();
-    DatabaseEncryption.initialize();
-
-    const isValid = await this.securitySession.validateSecuritySystem();
-    if (!isValid) {
-      throw new Error("New security system validation failed");
-    }
-
-    databaseLogger.success("New security system initialized", {
-      operation: "new_security_init_complete",
-    });
-  }
-
-  /**
-   * Detect users needing migration
-   */
-  private async detectUsersNeedingMigration(): Promise<any[]> {
-    const allUsers = await db.select().from(users);
-    const usersNeedingMigration = [];
-
-    for (const user of allUsers) {
-      // Check if user already has KEK salt (new system)
-      const kekSalt = await db
-        .select()
-        .from(settings)
-        .where(eq(settings.key, `user_kek_salt_${user.id}`));
-
-      if (kekSalt.length === 0) {
-        usersNeedingMigration.push(user);
-      }
-    }
-
-    databaseLogger.info(`Found ${usersNeedingMigration.length} users needing migration`, {
-      operation: "migration_user_detection",
-      totalUsers: allUsers.length,
-      needingMigration: usersNeedingMigration.length,
-    });
-
-    return usersNeedingMigration;
-  }
-
-  /**
-   * Migrate single user
-   */
-  private async migrateUser(user: any, result: MigrationResult): Promise<void> {
-    databaseLogger.info(`Migrating user: ${user.username}`, {
-      operation: "user_migration_start",
-      userId: user.id,
-      username: user.username,
-    });
-
-    if (this.config.dryRun) {
-      databaseLogger.info(`[DRY RUN] Would migrate user: ${user.username}`, {
-        operation: "user_migration_dry_run",
-        userId: user.id,
-      });
-      return;
-    }
-
-    // Issue: We need user's plaintext password to set up KEK
-    // but we only have password hash. Solutions:
-    // 1. Require user to re-enter password on first login
-    // 2. Generate temporary password and require user to change it
-    //
-    // For demonstration, we skip actual KEK setup and just mark user for password reset
-
-    try {
-      // Mark user needing encryption reset
-      await db.insert(settings).values({
-        key: `user_migration_required_${user.id}`,
-        value: JSON.stringify({
-          userId: user.id,
-          username: user.username,
-          migrationTime: new Date().toISOString(),
-          reason: "Security system upgrade - password re-entry required",
-        }),
-      });
-
-      result.warnings.push(`User ${user.username} marked for password re-entry on next login`);
-
-      databaseLogger.success(`User migration prepared: ${user.username}`, {
-        operation: "user_migration_prepared",
-        userId: user.id,
-        username: user.username,
-      });
-
-    } catch (error) {
-      databaseLogger.error(`Failed to prepare user migration: ${user.username}`, error, {
-        operation: "user_migration_prepare_failed",
-        userId: user.id,
-        username: user.username,
-      });
-      throw error;
-    }
-  }
-
-  /**
-   * Clean up old encryption system
-   */
-  private async cleanupOldSystem(): Promise<void> {
-    databaseLogger.info("Cleaning up old encryption system", {
-      operation: "old_system_cleanup",
-    });
-
-    try {
-      // Delete old encryption keys
-      await db.delete(settings).where(eq(settings.key, "db_encryption_key"));
-      await db.delete(settings).where(eq(settings.key, "encryption_key_created"));
-
-      // Keep JWT key (now managed by new system)
-      // Delete old jwt_secret, let new system take over
-      await db.delete(settings).where(eq(settings.key, "jwt_secret"));
-      await db.delete(settings).where(eq(settings.key, "jwt_secret_created"));
-
-      databaseLogger.success("Old encryption system cleaned up", {
-        operation: "old_system_cleanup_complete",
-      });
-
-    } catch (error) {
-      databaseLogger.error("Failed to cleanup old system", error, {
-        operation: "old_system_cleanup_failed",
-      });
-      throw error;
-    }
-  }
-
-  /**
-   * Check migration status
-   */
-  static async checkMigrationStatus(): Promise<{
-    migrationRequired: boolean;
-    usersNeedingMigration: number;
-    hasOldSystem: boolean;
-    hasNewSystem: boolean;
-  }> {
-    try {
-      // Check for old system
-      const oldEncryptionKey = await db
-        .select()
-        .from(settings)
-        .where(eq(settings.key, "db_encryption_key"));
-
-      // Check for new system
-      const newSystemJWT = await db
-        .select()
-        .from(settings)
-        .where(eq(settings.key, "system_jwt_secret"));
-
-      // Check users needing migration
-      const allUsers = await db.select().from(users);
-      let usersNeedingMigration = 0;
-
-      for (const user of allUsers) {
-        const kekSalt = await db
-          .select()
-          .from(settings)
-          .where(eq(settings.key, `user_kek_salt_${user.id}`));
-
-        if (kekSalt.length === 0) {
-          usersNeedingMigration++;
-        }
-      }
-
-      const hasOldSystem = oldEncryptionKey.length > 0;
-      const hasNewSystem = newSystemJWT.length > 0;
-      const migrationRequired = hasOldSystem || usersNeedingMigration > 0;
-
-      return {
-        migrationRequired,
-        usersNeedingMigration,
-        hasOldSystem,
-        hasNewSystem,
-      };
-
-    } catch (error) {
-      databaseLogger.error("Failed to check migration status", error, {
-        operation: "migration_status_check_failed",
-      });
-      throw error;
-    }
-  }
-
-  /**
-   * Handle user login migration (when user enters password)
-   */
-  static async handleUserLoginMigration(userId: string, password: string): Promise<boolean> {
-    try {
-      // Check if user needs migration
-      const migrationRequired = await db
-        .select()
-        .from(settings)
-        .where(eq(settings.key, `user_migration_required_${userId}`));
-
-      if (migrationRequired.length === 0) {
-        return false; // No migration needed
-      }
-
-      databaseLogger.info("Performing user migration during login", {
-        operation: "login_migration_start",
-        userId,
-      });
-
-      // Initialize user encryption
-      const securitySession = SecuritySession.getInstance();
-      await securitySession.registerUser(userId, password);
-
-      // Delete migration marker
-      await db.delete(settings).where(eq(settings.key, `user_migration_required_${userId}`));
-
-      databaseLogger.success("User migration completed during login", {
-        operation: "login_migration_complete",
-        userId,
-      });
-
-      return true; // Migration completed
-
-    } catch (error) {
-      databaseLogger.error("Login migration failed", error, {
-        operation: "login_migration_failed",
-        userId,
-      });
-      throw error;
-    }
-  }
-}
-
-// CLI execution
-if (import.meta.url === `file://${process.argv[1]}`) {
-  const config: MigrationConfig = {
-    dryRun: process.env.DRY_RUN === "true",
-    backupEnabled: process.env.BACKUP_ENABLED !== "false",
-    forceRegeneration: process.env.FORCE_REGENERATION === "true",
-  };
-
-  const migration = new SecurityMigration(config);
-
-  migration
-    .runMigration()
-    .then((result) => {
-      console.log("Migration completed:", result);
-      process.exit(result.success ? 0 : 1);
-    })
-    .catch((error) => {
-      console.error("Migration failed:", error.message);
-      process.exit(1);
-    });
-}
-
-export { SecurityMigration, type MigrationConfig, type MigrationResult };
\ No newline at end of file