refactor: enhance file handling and metrics tracking; remove unused bot health tracker

src/index.ts

@@ -5,7 +5,9 @@ import { handleFileInfo, handleFileRedirect } from './routes/files';
 import { handleHealth } from './routes/health';
 import { handleSwaggerHtml, handleSwaggerJson } from './routes/swagger';
 import { handleUpload } from './routes/upload';
+import { fileInfoCache } from './utils/cache';
 import logger from './utils/logger';
+import { metricsCollector } from './utils/metrics';
 import { cleanupRateLimitCache, withRateLimit } from './utils/rateLimit';
 
 const server = serve({
@@ -52,6 +54,28 @@ const gracefulShutdown = async (signal: string): Promise<void> => {
 process.on('SIGTERM', () => gracefulShutdown('SIGTERM'));
 process.on('SIGINT', () => gracefulShutdown('SIGINT'));
 
+// Periodic maintenance intervals
 setInterval(cleanupRateLimitCache, 60000);
+setInterval(
+  () => {
+    const removed = fileInfoCache.cleanup();
+    if (removed > 0) {
+      logger.info(`Cleaned up ${removed} expired cache entries`);
+    }
+  },
+  5 * 60 * 1000,
+);
+setInterval(
+  () => {
+    const snapshot = metricsCollector.getSnapshot();
+    logger.info('Metrics snapshot', {
+      uploadLatency: snapshot.uploadLatency,
+      uploadThroughput: snapshot.uploadThroughput.toFixed(2),
+      errorRate: snapshot.errorRate.toFixed(2),
+      cacheHitRate: snapshot.cacheHitRate.toFixed(2),
+    });
+  },
+  5 * 60 * 1000,
+);
 
 logger.info('Application running successfully');