Initial commit: Telegram Management System

Full-stack web application for Telegram management
- Frontend: Vue 3 + Vben Admin
- Backend: NestJS
- Features: User management, group broadcast, statistics

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

marketing-agent/services/user-management/src/middleware/errorHandler.js

@@ -0,0 +1,80 @@
+import { logger } from '../utils/logger.js';
+
+export const errorHandler = (err, req, res, next) => {
+    // Log error
+    logger.error('Error occurred:', {
+        error: err.message,
+        stack: err.stack,
+        url: req.url,
+        method: req.method,
+        body: req.body,
+        params: req.params,
+        query: req.query
+    });
+
+    // Mongoose validation error
+    if (err.name === 'ValidationError') {
+        const errors = Object.values(err.errors).map(e => e.message);
+        return res.status(400).json({
+            error: 'Validation failed',
+            details: errors
+        });
+    }
+
+    // Mongoose duplicate key error
+    if (err.code === 11000) {
+        const field = Object.keys(err.keyPattern)[0];
+        return res.status(400).json({
+            error: 'Duplicate value',
+            field,
+            message: `${field} already exists`
+        });
+    }
+
+    // Mongoose cast error
+    if (err.name === 'CastError') {
+        return res.status(400).json({
+            error: 'Invalid ID format',
+            field: err.path,
+            value: err.value
+        });
+    }
+
+    // JWT errors
+    if (err.name === 'JsonWebTokenError') {
+        return res.status(401).json({
+            error: 'Invalid token'
+        });
+    }
+
+    if (err.name === 'TokenExpiredError') {
+        return res.status(401).json({
+            error: 'Token expired'
+        });
+    }
+
+    // Custom business logic errors
+    if (err.message.includes('not found')) {
+        return res.status(404).json({
+            error: err.message
+        });
+    }
+
+    if (err.message.includes('already exists')) {
+        return res.status(409).json({
+            error: err.message
+        });
+    }
+
+    if (err.message.includes('Cannot') || err.message.includes('Invalid')) {
+        return res.status(400).json({
+            error: err.message
+        });
+    }
+
+    // Default error
+    res.status(err.status || 500).json({
+        error: err.message || 'Internal server error',
+        ...(process.env.NODE_ENV === 'development' && { stack: err.stack })
+    });
+};