fix: 修复实时RPM/TPM指标显示为0的问题

- 添加调试日志以追踪数据读取过程
- 修复getRealtimeSystemMetrics中的数据验证逻辑
- 添加测试脚本用于验证时间戳匹配问题
- 改进错误处理和日志记录

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

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

scripts/test-realtime-metrics.js

@@ -0,0 +1,69 @@
+const redis = require('../src/models/redis');
+const logger = require('../src/utils/logger');
+
+async function testRealtimeMetrics() {
+  try {
+    // 连接Redis
+    await redis.connect();
+    
+    // 获取当前时间戳
+    const now = new Date();
+    const currentMinute = Math.floor(now.getTime() / 60000);
+    
+    console.log('=== 时间戳测试 ===');
+    console.log('当前时间:', now.toISOString());
+    console.log('当前分钟时间戳:', currentMinute);
+    console.log('');
+    
+    // 检查最近5分钟的键
+    console.log('=== 检查Redis键 ===');
+    const client = redis.getClient();
+    for (let i = 0; i < 5; i++) {
+      const minuteKey = `system:metrics:minute:${currentMinute - i}`;
+      const exists = await client.exists(minuteKey);
+      const data = await client.hgetall(minuteKey);
+      
+      console.log(`键: ${minuteKey}`);
+      console.log(`  存在: ${exists ? '是' : '否'}`);
+      if (exists && data) {
+        console.log(`  数据: requests=${data.requests}, totalTokens=${data.totalTokens}`);
+      }
+      console.log('');
+    }
+    
+    // 调用getRealtimeSystemMetrics
+    console.log('=== 调用 getRealtimeSystemMetrics ===');
+    const metrics = await redis.getRealtimeSystemMetrics();
+    console.log('结果:', JSON.stringify(metrics, null, 2));
+    
+    // 列出所有system:metrics:minute:*键
+    console.log('\n=== 所有系统指标键 ===');
+    const allKeys = await client.keys('system:metrics:minute:*');
+    console.log('找到的键数量:', allKeys.length);
+    if (allKeys.length > 0) {
+      // 排序并显示最新的10个
+      allKeys.sort((a, b) => {
+        const aNum = parseInt(a.split(':').pop());
+        const bNum = parseInt(b.split(':').pop());
+        return bNum - aNum;
+      });
+      
+      console.log('最新的10个键:');
+      for (let i = 0; i < Math.min(10, allKeys.length); i++) {
+        const key = allKeys[i];
+        const timestamp = parseInt(key.split(':').pop());
+        const timeDiff = currentMinute - timestamp;
+        console.log(`  ${key} (${timeDiff}分钟前)`);
+      }
+    }
+    
+  } catch (error) {
+    console.error('测试失败:', error);
+  } finally {
+    await redis.disconnect();
+    process.exit(0);
+  }
+}
+
+// 运行测试
+testRealtimeMetrics();