Enterprise AI API Security Audit: HolySheep Request Logs, Key Isolation và Abnormal Consumption Tracking

Trong bối cảnh chi phí AI API ngày càng tăng và các mối đe dọa bảo mật ngày càng phức tạp, việc triển khai hệ thống audit cho AI API không còn là lựa chọn mà là yêu cầu bắt buộc đối với doanh nghiệp. Bài viết này sẽ hướng dẫn chi tiết cách xây dựng Enterprise AI API Security Audit với HolySheep, bao gồm request logging, key isolation và abnormal consumption tracking.

Bảng so sánh: HolySheep vs API Chính thức vs Dịch vụ Relay

Tiêu chí	HolySheep AI	API Chính thức (OpenAI/Anthropic)	Dịch vụ Relay khác
Chi phí GPT-4.1	$8/MTok	$60/MTok	$15-40/MTok
Chi phí Claude Sonnet 4.5	$15/MTok	$90/MTok	$25-50/MTok
Chi phí Gemini 2.5 Flash	$2.50/MTok	$15/MTok	$5-12/MTok
DeepSeek V3.2	$0.42/MTok	Không có	$0.80-2/MTok
Request Logging	Tích hợp sẵn	Cần tự xây dựng	Hạn chế
Key Isolation	Đa tenant, workspace riêng	Không hỗ trợ	Chia sẻ key
Abnormal Consumption Alert	Real-time, tự động	Cần webhook/logging riêng	Thủ công
Thanh toán	WeChat/Alipay, USD	Chỉ thẻ quốc tế	Đa dạng
Độ trễ trung bình	<50ms	100-300ms	80-200ms
Tín dụng miễn phí	Có khi đăng ký	$5 trial	Không
Tiết kiệm	85%+	Baseline	30-70%

Tại sao Enterprise cần AI API Security Audit?

Khi triển khai AI API trong production, doanh nghiệp đối mặt với nhiều rủi ro:

• Chi phí phát sinh bất thường: API key bị leak có thể gây thiệt hại hàng ngàn đô la trong vài giờ
• Không minh bạch trong sử dụng: Không biết developer nào, ứng dụng nào đang tiêu tốn bao nhiêu token
• Compliance và Audit Trail: Cần log đầy đủ cho SOX, SOC2 hoặc các quy định nội bộ
• Performance degradation: Không phát hiện kịp thời các request bất thường

Với HolySheep AI, toàn bộ các tính năng này được tích hợp sẵn, giúp doanh nghiệp tiết kiệm hàng triệu đồng chi phí xây dựng hệ thống audit riêng.

1. Cấu trúc dự án Enterprise AI Security Audit

enterprise-ai-audit/
├── src/
│   ├── config/
│   │   ├── holySheepConfig.js      # Cấu hình HolySheep API
│   │   └── alertConfig.js          # Cấu hình cảnh báo
│   ├── services/
│   │   ├── requestLogger.js        # Ghi log request
│   │   ├── keyManager.js           # Quản lý key isolation
│   │   ├── consumptionTracker.js   # Theo dõi tiêu thụ
│   │   └── alertService.js         # Dịch vụ cảnh báo
│   ├── middleware/
│   │   ├── auditMiddleware.js      # Middleware audit
│   │   └── rateLimitMiddleware.js  # Rate limiting
│   ├── routes/
│   │   └── auditRoutes.js          # API routes cho audit
│   └── utils/
│       └── costCalculator.js       # Tính toán chi phí
├── logs/                           # Thư mục lưu log
├── tests/
│   └── audit.test.js               # Unit tests
├── .env.example                    # Template biến môi trường
└── package.json

2. Cấu hình HolySheep API với Key Isolation

// src/config/holySheepConfig.js
const HOLYSHEEP_CONFIG = {
    baseUrl: 'https://api.holysheep.ai/v1',
    apiKey: process.env.HOLYSHEEP_API_KEY,
    
    // Workspace isolation - mỗi team/project có workspace riêng
    workspace: {
        default: process.env.DEFAULT_WORKSPACE_ID,
        teams: {
            backend: process.env.BACKEND_TEAM_WORKSPACE,
            frontend: process.env.FRONTEND_TEAM_WORKSPACE,
            ml: process.env.ML_TEAM_WORKSPACE,
            qa: process.env.QA_TEAM_WORKSPACE
        }
    },
    
    // Model pricing (USD per 1M tokens) - 2026
    models: {
        'gpt-4.1': { input: 8, output: 24 },
        'claude-sonnet-4.5': { input: 15, output: 75 },
        'gemini-2.5-flash': { input: 2.50, output: 10 },
        'deepseek-v3.2': { input: 0.42, output: 1.68 }
    },
    
    // Alert thresholds (USD)
    alertThresholds: {
        dailyLimit: 100,        // Cảnh báo khi chi phí/ngày > $100
        hourlyLimit: 20,        // Cảnh báo khi chi phí/giờ > $20
        burstThreshold: 50,     // Cảnh báo khi request/giây > 50
        tokenBurst: 1000000     // Cảnh báo khi tokens/request > 1M
    },
    
    // Request logging config
    logging: {
        enabled: true,
        retentionDays: 90,
        logLevel: 'detailed',   // minimal, standard, detailed
        sensitiveFields: ['api_key', 'password', 'token']
    }
};

module.exports = HOLYSHEEP_CONFIG;

3. Request Logger Service - Ghi log chi tiết

// src/services/requestLogger.js
const fs = require('fs');
const path = require('path');
const crypto = require('crypto');
const HOLYSHEEP_CONFIG = require('../config/holySheepConfig');

class RequestLogger {
    constructor() {
        this.logDir = path.join(__dirname, '../../logs');
        this.ensureLogDirectory();
    }
    
    ensureLogDirectory() {
        if (!fs.existsSync(this.logDir)) {
            fs.mkdirSync(this.logDir, { recursive: true });
        }
    }
    
    // Hash sensitive data trước khi log
    maskSensitiveData(data) {
        if (!data) return data;
        
        const masked = { ...data };
        HOLYSHEEP_CONFIG.logging.sensitiveFields.forEach(field => {
            if (masked[field]) {
                masked[field] = '***REDACTED***';
            }
        });
        
        // Đặc biệt mask API key partial
        if (masked.api_key || masked.key) {
            const key = masked.api_key || masked.key;
            masked.key_preview = key.substring(0, 8) + '...' + key.slice(-4);
        }
        
        return masked;
    }
    
    // Calculate chi phí cho một request
    calculateRequestCost(model, usage) {
        const modelPricing = HOLYSHEEP_CONFIG.models[model];
        if (!modelPricing) return 0;
        
        const inputCost = (usage.prompt_tokens / 1000000) * modelPricing.input;
        const outputCost = (usage.completion_tokens / 1000000) * modelPricing.output;
        
        return {
            inputCost: Math.round(inputCost * 10000) / 10000, // 4 decimal places
            outputCost: Math.round(outputCost * 10000) / 10000,
            totalCost: Math.round((inputCost + outputCost) * 10000) / 10000
        };
    }
    
    // Generate unique request ID
    generateRequestId() {
        return req_${Date.now()}_${crypto.randomBytes(4).toString('hex')};
    }
    
    // Log request mới
    logRequest(reqData) {
        const timestamp = new Date().toISOString();
        const requestId = this.generateRequestId();
        
        const logEntry = {
            request_id: requestId,
            timestamp,
            workspace_id: reqData.workspaceId,
            team: reqData.team,
            application: reqData.application,
            
            // Request details
            model: reqData.model,
            endpoint: reqData.endpoint,
            method: reqData.method || 'POST',
            
            // Usage
            usage: {
                prompt_tokens: reqData.promptTokens || 0,
                completion_tokens: reqData.completionTokens || 0,
                total_tokens: (reqData.promptTokens || 0) + (reqData.completionTokens || 0)
            },
            
            // Cost
            cost: reqData.usage ? 
                this.calculateRequestCost(reqData.model, reqData.usage) : 
                { inputCost: 0, outputCost: 0, totalCost: 0 },
            
            // Performance
            latency_ms: reqData.latencyMs,
            time_to_first_token: reqData.timeToFirstToken,
            
            // Metadata
            user_id: reqData.userId,
            ip_address: this.maskIp(reqData.ipAddress),
            user_agent: reqData.userAgent,
            
            // Error tracking
            error: reqData.error || null,
            error_code: reqData.errorCode,
            
            // Request body (masked)
            request_body: this.maskSensitiveData(reqData.body)
        };
        
        // Write to daily log file
        const dateStr = timestamp.split('T')[0];
        const logFile = path.join(this.logDir, audit_${dateStr}.jsonl);
        
        fs.appendFileSync(logFile, JSON.stringify(logEntry) + '\n');
        
        // Write to team-specific log
        if (reqData.team) {
            const teamLogFile = path.join(this.logDir, team_${reqData.team}_${dateStr}.jsonl);
            fs.appendFileSync(teamLogFile, JSON.stringify(logEntry) + '\n');
        }
        
        return requestId;
    }
    
    maskIp(ip) {
        if (!ip) return null;
        const parts = ip.split('.');
        if (parts.length === 4) {
            return ${parts[0]}.${parts[1]}.***.${parts[3]};
        }
        return ip;
    }
    
    // Query logs với filters
    async queryLogs(filters = {}) {
        const { startDate, endDate, team, model, minCost, maxCost } = filters;
        
        // Implementation for querying logs
        // Trả về array các log entries thỏa mãn filter
        return [];
    }
    
    // Aggregate costs theo ngày/team/model
    async aggregateCosts(groupBy = 'day') {
        // Implementation for cost aggregation
        return {};
    }
}

module.exports = new RequestLogger();

4. Key Manager với Workspace Isolation

// src/services/keyManager.js
const crypto = require('crypto');
const HOLYSHEEP_CONFIG = require('../config/holySheepConfig');

class KeyManager {
    constructor() {
        // In-memory key store (thay bằng database trong production)
        this.keys = new Map();
        this.workspaces = new Map();
    }
    
    // Tạo workspace mới cho team
    createWorkspace(teamName, metadata = {}) {
        const workspaceId = ws_${teamName}_${Date.now()};
        
        const workspace = {
            id: workspaceId,
            name: teamName,
            created_at: new Date().toISOString(),
            monthly_limit: metadata.monthlyLimit || 1000, // USD
            daily_limit: metadata.dailyLimit || 100,
            hourly_limit: metadata.hourlyLimit || 20,
            models_allowed: metadata.allowedModels || Object.keys(HOLYSHEEP_CONFIG.models),
            status: 'active',
            metadata
        };
        
        this.workspaces.set(workspaceId, workspace);
        
        // Tạo API key cho workspace
        const apiKey = this.createApiKey(workspaceId);
        
        return { workspace, apiKey };
    }
    
    // Tạo API key mới
    createApiKey(workspaceId, options = {}) {
        const prefix = 'hssk'; // HolySheep Secret Key prefix
        const randomPart = crypto.randomBytes(24).toString('base64');
        const apiKey = ${prefix}_${randomPart};
        
        const keyRecord = {
            key: apiKey,
            key_preview: apiKey.substring(0, 12) + '...',
            workspace_id: workspaceId,
            name: options.name || 'Default Key',
            created_at: new Date().toISOString(),
            last_used: null,
            usage_count: 0,
            total_cost: 0,
            permissions: options.permissions || ['chat', 'embeddings'],
            rate_limit: options.rateLimit || { requests_per_minute: 60 },
            status: 'active'
        };
        
        this.keys.set(apiKey, keyRecord);
        return apiKey;
    }
    
    // Validate API key
    validateApiKey(apiKey) {
        const keyRecord = this.keys.get(apiKey);
        
        if (!keyRecord) {
            return { valid: false, error: 'Invalid API key' };
        }
        
        if (keyRecord.status !== 'active') {
            return { valid: false, error: 'API key is inactive' };
        }
        
        // Check workspace status
        const workspace = this.workspaces.get(keyRecord.workspace_id);
        if (!workspace || workspace.status !== 'active') {
            return { valid: false, error: 'Workspace is inactive' };
        }
        
        // Update last used
        keyRecord.last_used = new Date().toISOString();
        keyRecord.usage_count++;
        
        return {
            valid: true,
            keyRecord,
            workspace
        };
    }
    
    // Get available models cho workspace
    getAllowedModels(workspaceId) {
        const workspace = this.workspaces.get(workspaceId);
        if (!workspace) return [];
        return workspace.models_allowed;
    }
    
    // Kiểm tra và enforce rate limit
    checkRateLimit(apiKey) {
        const keyRecord = this.keys.get(apiKey);
        if (!keyRecord) return { allowed: false, error: 'Invalid key' };
        
        const { rate_limit } = keyRecord;
        
        // Implement rate limit checking với sliding window
        // Trả về { allowed: true/false, remaining: number, reset: timestamp }
        
        return { 
            allowed: true, 
            remaining: rate_limit.requests_per_minute - 1,
            reset: Date.now() + 60000
        };
    }
    
    // Revoke API key
    revokeKey(apiKey) {
        const keyRecord = this.keys.get(apiKey);
        if (keyRecord) {
            keyRecord.status = 'revoked';
            keyRecord.revoked_at = new Date().toISOString();
            return true;
        }
        return false;
    }
    
    // Get workspace usage statistics
    getWorkspaceStats(workspaceId) {
        const workspace = this.workspaces.get(workspaceId);
        if (!workspace) return null;
        
        // Calculate total usage từ keys
        let totalUsage = { count: 0, cost: 0 };
        this.keys.forEach((key) => {
            if (key.workspace_id === workspaceId) {
                totalUsage.count += key.usage_count;
                totalUsage.cost += key.total_cost;
            }
        });
        
        return {
            workspace,
            total_usage: totalUsage,
            monthly_limit: workspace.monthly_limit,
            usage_percentage: (totalUsage.cost / workspace.monthly_limit) * 100,
            remaining_credit: workspace.monthly_limit - totalUsage.cost
        };
    }
}

// Singleton instance
const keyManager = new KeyManager();

// Tạo sample workspaces
keyManager.createWorkspace('backend', {
    monthlyLimit: 500,
    allowedModels: ['gpt-4.1', 'deepseek-v3.2']
});

keyManager.createWorkspace('frontend', {
    monthlyLimit: 200,
    allowedModels: ['gemini-2.5-flash']
});

keyManager.createWorkspace('ml', {
    monthlyLimit: 1000,
    allowedModels: ['claude-sonnet-4.5', 'gpt-4.1', 'deepseek-v3.2']
});

module.exports = keyManager;

5. Abnormal Consumption Tracker với Real-time Alerts

// src/services/consumptionTracker.js
const HOLYSHEEP_CONFIG = require('../config/holySheepConfig');

class ConsumptionTracker {
    constructor() {
        // In-memory stores (thay bằng Redis trong production)
        this.hourlyUsage = new Map();    // workspace_id -> hourly data
        this.dailyUsage = new Map();     // workspace_id -> daily data
        this.requestBuffer = [];         // Buffer cho real-time processing
        this.alertCallbacks = [];
    }
    
    // Register alert callback
    onAlert(callback) {
        this.alertCallbacks.push(callback);
    }
    
    // Track request usage
    trackUsage(workspaceId, cost, tokens, metadata = {}) {
        const now = new Date();
        const hourKey = ${workspaceId}_${now.toISOString().slice(0, 13)};
        const dayKey = ${workspaceId}_${now.toISOString().slice(0, 10)};
        
        // Update hourly usage
        if (!this.hourlyUsage.has(hourKey)) {
            this.hourlyUsage.set(hourKey, {
                workspace_id: workspaceId,
                hour: hourKey,
                total_cost: 0,
                request_count: 0,
                total_tokens: 0,
                models_used: {}
            });
        }
        
        const hourly = this.hourlyUsage.get(hourKey);
        hourly.total_cost += cost;
        hourly.request_count++;
        hourly.total_tokens += tokens;
        
        // Track by model
        const model = metadata.model || 'unknown';
        if (!hourly.models_used[model]) {
            hourly.models_used[model] = { cost: 0, tokens: 0, count: 0 };
        }
        hourly.models_used[model].cost += cost;
        hourly.models_used[model].tokens += tokens;
        hourly.models_used[model].count++;
        
        // Update daily usage
        if (!this.dailyUsage.has(dayKey)) {
            this.dailyUsage.set(dayKey, {
                workspace_id: workspaceId,
                date: dayKey,
                total_cost: 0,
                request_count: 0,
                total_tokens: 0,
                hourly_breakdown: {}
            });
        }
        
        const daily = this.dailyUsage.get(dayKey);
        daily.total_cost += cost;
        daily.request_count++;
        daily.total_tokens += tokens;
        
        const hour = now.getHours();
        if (!daily.hourly_breakdown[hour]) {
            daily.hourly_breakdown[hour] = { cost: 0, count: 0 };
        }
        daily.hourly_breakdown[hour].cost += cost;
        daily.hourly_breakdown[hour].count++;
        
        // Check thresholds and trigger alerts
        this.checkAndAlert(workspaceId, hourly, daily, metadata);
    }
    
    // Check thresholds and trigger alerts
    checkAndAlert(workspaceId, hourlyData, dailyData, metadata) {
        const workspace = keyManager.workspaces.get(workspaceId);
        if (!workspace) return;
        
        const alerts = [];
        
        // Hourly cost threshold
        if (hourlyData.total_cost > HOLYSHEEP_CONFIG.alertThresholds.hourlyLimit) {
            alerts.push({
                type: 'HOURLY_COST_EXCEEDED',
                severity: 'HIGH',
                workspace_id: workspaceId,
                message: Hourly cost exceeded: $${hourlyData.total_cost.toFixed(2)} (limit: $${HOLYSHEEP_CONFIG.alertThresholds.hourlyLimit}),
                current: hourlyData.total_cost,
                limit: HOLYSHEEP_CONFIG.alertThresholds.hourlyLimit,
                timestamp: new Date().toISOString()
            });
        }
        
        // Daily cost threshold
        if (dailyData.total_cost > HOLYSHEEP_CONFIG.alertThresholds.dailyLimit) {
            alerts.push({
                type: 'DAILY_COST_EXCEEDED',
                severity: 'CRITICAL',
                workspace_id: workspaceId,
                message: Daily cost exceeded: $${dailyData.total_cost.toFixed(2)} (limit: $${HOLYSHEEP_CONFIG.alertThresholds.dailyLimit}),
                current: dailyData.total_cost,
                limit: HOLYSHEEP_CONFIG.alertThresholds.dailyLimit,
                timestamp: new Date().toISOString()
            });
        }
        
        // Monthly budget check
        const monthlyUsage = this.getMonthlyUsage(workspaceId);
        if (monthlyUsage > workspace.monthly_limit) {
            alerts.push({
                type: 'MONTHLY_BUDGET_EXCEEDED',
                severity: 'CRITICAL',
                workspace_id: workspaceId,
                message: Monthly budget exceeded: $${monthlyUsage.toFixed(2)} (budget: $${workspace.monthly_limit}),
                current: monthlyUsage,
                limit: workspace.monthly_limit,
                timestamp: new Date().toISOString()
            });
        }
        
        // Burst detection (high request rate)
        if (hourlyData.request_count > HOLYSHEEP_CONFIG.alertThresholds.burstThreshold * 60) {
            alerts.push({
                type: 'BURST_DETECTED',
                severity: 'MEDIUM',
                workspace_id: workspaceId,
                message: Unusual request burst: ${hourlyData.request_count} requests in current hour,
                current: hourlyData.request_count,
                threshold: HOLYSHEEP_CONFIG.alertThresholds.burstThreshold * 60,
                timestamp: new Date().toISOString()
            });
        }
        
        // Token burst (very long requests)
        if (metadata.promptTokens > HOLYSHEEP_CONFIG.alertThresholds.tokenBurst) {
            alerts.push({
                type: 'LARGE_REQUEST_DETECTED',
                severity: 'LOW',
                workspace_id: workspaceId,
                message: Large token request: ${metadata.promptTokens.toLocaleString()} tokens,
                tokens: metadata.promptTokens,
                estimated_cost: metadata.estimatedCost,
                timestamp: new Date().toISOString()
            });
        }
        
        // Fire alerts
        alerts.forEach(alert => this.fireAlert(alert));
    }
    
    // Fire alert to all registered callbacks
    fireAlert(alert) {
        console.error([ALERT] ${alert.severity}: ${alert.message});
        this.alertCallbacks.forEach(callback => {
            try {
                callback(alert);
            } catch (err) {
                console.error('Alert callback error:', err);
            }
        });
    }
    
    // Get monthly usage for workspace
    getMonthlyUsage(workspaceId) {
        const now = new Date();
        const monthStart = ${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, '0')}-01;
        
        let total = 0;
        this.dailyUsage.forEach((data, key) => {
            if (key.startsWith(workspaceId) && key >= monthStart) {
                total += data.total_cost;
            }
        });
        
        return total;
    }
    
    // Get dashboard data
    getDashboardData(workspaceId) {
        const now = new Date();
        const today = now.toISOString().slice(0, 10);
        const thisMonth = ${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, '0')};
        
        const workspace = keyManager.workspaces.get(workspaceId);
        if (!workspace) return null;
        
        const todayData = this.dailyUsage.get(${workspaceId}_${today});
        const monthlyUsage = this.getMonthlyUsage(workspaceId);
        
        // Get hourly breakdown for today
        const hourlyBreakdown = [];
        for (let h = 0; h < 24; h++) {
            const hourKey = ${workspaceId}_${today}T${String(h).padStart(2, '0')};
            const hourData = this.hourlyUsage.get(hourKey);
            hourlyBreakdown.push({
                hour: h,
                cost: hourData?.total_cost || 0,
                requests: hourData?.request_count || 0
            });
        }
        
        return {
            workspace_id: workspaceId,
            workspace_name: workspace.name,
            budget: {
                monthly: workspace.monthly_limit,
                daily: workspace.daily_limit,
                hourly: workspace.hourly_limit
            },
            usage: {
                today: {
                    cost: todayData?.total_cost || 0,
                    requests: todayData?.request_count || 0,
                    tokens: todayData?.total_tokens || 0
                },
                this_month: {
                    cost: monthlyUsage,
                    requests: this.getMonthlyRequestCount(workspaceId),
                    tokens: this.getMonthlyTokenCount(workspaceId)
                },
                hourly_breakdown: hourlyBreakdown
            },
            utilization: {
                monthly_percent: (monthlyUsage / workspace.monthly_limit) * 100,
                daily_percent: ((todayData?.total_cost || 0) / workspace.daily_limit) * 100
            }
        };
    }
    
    getMonthlyRequestCount(workspaceId) {
        let count = 0;
        this.dailyUsage.forEach((data, key) => {
            if (key.startsWith(workspaceId) && key.includes(thisMonth)) {
                count += data.request_count;
            }
        });
        return count;
    }
    
    getMonthlyTokenCount(workspaceId) {
        let tokens = 0;
        this.dailyUsage.forEach((data, key) => {
            if (key.startsWith(workspaceId) && key.includes(thisMonth)) {
                tokens += data.total_tokens;
            }
        });
        return tokens;
    }
}

module.exports = new ConsumptionTracker();

6. Integration với HolySheep API - Complete Example

// src/services/holySheepClient.js
const HOLYSHEEP_CONFIG = require('../config/holySheepConfig');
const requestLogger = require('./requestLogger');
const consumptionTracker = require('./consumptionTracker');
const keyManager = require('./keyManager');

class HolySheepClient {
    constructor(apiKey) {
        this.baseUrl = HOLYSHEEP_CONFIG.baseUrl;
        this.apiKey = apiKey;
    }
    
    // Unified API call method với auto-logging
    async chatCompletion(model, messages, options = {}) {
        const startTime = Date.now();
        const workspaceId = options.workspaceId || 'default';
        
        // Validate API key
        const validation = keyManager.validateApiKey(this.apiKey);
        if (!validation.valid) {
            throw new Error(API Key validation failed: ${validation.error});
        }
        
        // Check if model is allowed
        const allowedModels = keyManager.getAllowedModels(validation.workspace.id);
        if (!allowedModels.includes(model)) {
            throw new Error(Model ${model} not allowed for this workspace. Allowed: ${allowedModels.join(', ')});
        }
        
        try {
            // Make request to HolySheep API
            const response = await fetch(${this.baseUrl}/chat/completions, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'Authorization': Bearer ${this.apiKey},
                    'X-Workspace-ID': validation.workspace.id
                },
                body: JSON.stringify({
                    model,
                    messages,
                    ...options
                })
            });
            
            const latencyMs = Date.now() - startTime;
            
            if (!response.ok) {
                const error = await response.json();
                throw new Error(HolySheep API Error: ${error.message || response.statusText});
            }
            
            const data = await response.json();
            
            // Extract usage
            const usage = data.usage || {
                prompt_tokens: 0,
                completion_tokens: 0,
                total_tokens: 0
            };
            
            // Calculate cost
            const cost = requestLogger.calculateRequestCost(model, usage);
            
            // Log request
            const requestId = requestLogger.logRequest({
                workspaceId: validation.workspace.id,
                team: validation.workspace.name,
                model,
                endpoint: '/chat/completions',
                promptTokens: usage.prompt_tokens,
                completionTokens: usage.completion_tokens,
                latencyMs,
                cost
            });
            
            // Track consumption
            consumptionTracker.trackUsage(validation.workspace.id, cost.totalCost, usage.total_tokens, {
                model,
                promptTokens: usage.prompt_tokens
            });
            
            return {
                ...data,
                _audit: {
                    request_id: requestId,
                    cost,
                    latency_ms: latencyMs,
                    workspace_id: validation.workspace.id
                }
            };
            
        } catch (error) {
            // Log failed request
            requestLogger.logRequest({
                workspaceId: validation.workspace.id,
                team: validation.workspace.name,
                model,
                endpoint: '/chat/completions',
                latencyMs: Date.now() - startTime,
                error: error.message,
                errorCode: error.code
            });
            
            throw error;
        }
    }
    
    // Streaming completion với audit
    async *chatCompletionStream(model, messages, options = {}) {
        const startTime = Date.now();
        const validation = keyManager.validateApiKey(this.apiKey);
        
        if (!validation.valid) {
            throw new Error(API Key validation failed: ${validation.error});
        }
        
        let fullResponse = '';
        let totalTokens = 0;
        
        const response = await fetch(${this.baseUrl}/chat/completions, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'Authorization': Bearer ${this.apiKey},
                'X-Workspace-ID': validation.workspace.id
            },
            body: JSON.stringify({
                model,
                messages,
                stream: true,
                ...options
            })
        });
        
        if (!response.ok) {
            throw new Error(HolySheep API Error: ${response.statusText});
        }
        
        const reader = response.body.getReader();
        const decoder = new TextDecoder();
        
        try {
            while (true) {
                const { done, value } = await reader.read();
                if (done) break;
                
                const chunk = decoder.decode(value);
                const lines = chunk.split('\n').filter(line => line.trim());
                
                for (const line of lines) {
                    if (line.startsWith('data: ')) {
                        const data = line.slice(6);
                        if (data === '[DONE]') continue;
                        
                        try {
                            const parsed = JSON.parse(data);
                            if (parsed.choices?.[0]?.delta?.content) {
                                fullResponse += parsed.choices[0].delta.content;
                            }
                            if (parsed.usage) {
                                totalTokens = parsed.usage.total_tokens;
                            }
                            yield parsed;
                        } catch (e) {
                            // Skip invalid JSON
                        }
                    }
                }
            }
            
            // Log streaming completion
            const latencyMs = Date.now() - startTime;
            const cost = requestLogger.calculateRequestCost(model, {
                prompt_tokens: Math.floor(totalTokens *
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