feat: telegram chat throttle cleanup

lib/notification/adapter/telegram.js

@@ -7,6 +7,15 @@ const MAX_ENTITIES_PER_CHUNK = 8;
 const RATE_LIMIT_INTERVAL = 1000;
 const chatThrottleMap = new Map();
 
+function cleanupOldThrottles() {
+  const now = Date.now();
+  for (const [chatId, chatThrottle] of chatThrottleMap.entries()) {
+    if (now - chatThrottle.lastUsedAt > RATE_LIMIT_INTERVAL) {
+      chatThrottleMap.delete(chatId);
+    }
+  }
+}
+
 /**
  * Returns a throttled async function for sending messages to a specific chat.
  * Telegram enforces a rate limit of 1 message per second per chat (chatId).
@@ -15,11 +24,24 @@ const chatThrottleMap = new Map();
  * @param {Function} fn - The async function to throttle (should send the message).
  * @returns {Function} Throttled async function for sending messages.
  */
-function getThrottled(chatId, fn) {
-  if (!chatThrottleMap.has(chatId)) {
-    chatThrottleMap.set(chatId, pThrottle({ limit: 1, interval: RATE_LIMIT_INTERVAL })(fn));
+function getThrottled(chatId, call) {
+  cleanupOldThrottles();
+
+  const now = Date.now();
+  const chatThrottle = chatThrottleMap.get(chatId);
+
+  if (chatThrottle) {
+    chatThrottle.lastUsedAt = now;
+    return chatThrottle.throttled;
   }
-  return chatThrottleMap.get(chatId);
+
+  // Create new throttled function
+  const newThrottle = {
+    lastUsedAt: now,
+    throttled: pThrottle({ limit: 1, interval: RATE_LIMIT_INTERVAL })(call),
+  };
+  chatThrottleMap.set(chatId, newThrottle);
+  return newThrottle.throttled;
 }
 
 /**