fix: support large accounts and archived chats in channel discovery

- Increase getChats pagination from 50 pages (5K chats) to 500 pages
  (50K chats) to support accounts with many channels/groups
- Load from both chatListMain AND chatListArchive so older/archived
  chats are discovered and scannable
- Deduplicate chat IDs across both lists
- Worker startup also loads both lists before scanning

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

worker/src/tdlib/chats.ts

@@ -34,16 +34,22 @@ export async function getAccountChats(
     log.warn("Failed to get current user via getMe");
   }
 
-  // Load ALL chats from the main list by paginating getChats.
+  // Load ALL chats from both main and archive lists by paginating getChats.
   // TDLib's getChats returns batches — keep calling until it returns
   // an empty list, which signals all chats have been loaded.
-  const MAX_PAGES = 50; // safety limit (50 × 100 = 5000 chats)
+  const seenChatIds = new Set<number>();
+
+  for (const chatList of [
+    { _: "chatListMain" as const },
+    { _: "chatListArchive" as const },
+  ]) {
+    const MAX_PAGES = 500; // support up to 50,000 chats per list
     for (let page = 0; page < MAX_PAGES; page++) {
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
       const result = (await withFloodWait(
         () => client.invoke({
           _: "getChats",
-        chat_list: { _: "chatListMain" },
+          chat_list: chatList,
           limit: 100,
         }),
         "getChats"
@@ -54,6 +60,9 @@ export async function getAccountChats(
       }
 
       for (const chatId of result.chat_ids) {
+        if (seenChatIds.has(chatId)) continue;
+        seenChatIds.add(chatId);
+
         try {
           // eslint-disable-next-line @typescript-eslint/no-explicit-any
           const chat = (await withFloodWait(
@@ -109,10 +118,11 @@ export async function getAccountChats(
 
       await sleep(config.apiDelayMs);
     }
+  }
 
   log.info(
     { total: chats.length },
-    "Fetched all chats from Telegram"
+    "Fetched all chats from Telegram (main + archive)"
   );
 
   return chats;

worker/src/worker.ts

@@ -338,11 +338,16 @@ export async function runWorkerForAccount(
     // Load the full chat list so TDLib knows about all chats.
     // Without this, getChat/searchChatMessages fail with "Chat not found".
     // TDLib returns chats in batches — keep calling until empty.
+    // Load from both main and archive lists to cover older/archived chats.
+    for (const chatList of [
+      { _: "chatListMain" as const },
+      { _: "chatListArchive" as const },
+    ]) {
       try {
-      for (let page = 0; page < 50; page++) {
+        for (let page = 0; page < 500; page++) {
           const chatResult = await client.invoke({
             _: "getChats",
-          chat_list: { _: "chatListMain" },
+            chat_list: chatList,
             limit: 100,
           }) as { chat_ids?: number[] };
           if (!chatResult.chat_ids || chatResult.chat_ids.length === 0) break;
@@ -350,6 +355,7 @@ export async function runWorkerForAccount(
       } catch {
         // Ignore — chat list may already be loaded
       }
+    }
 
     const counters = {
       messagesScanned: 0,