Reduce ingestion buffering and improve author metadata fallback.

Flush context blocks faster to avoid delayed indexing and use sender_id-based labels when Telegram sender objects are unavailable in historical messages.

Co-authored-by: Cursor <cursoragent@cursor.com>

script.py

@@ -57,13 +57,15 @@ client = TelegramClient(
     auto_reconnect=True,
 )
 
-def build_author(sender) -> dict:
+def build_author(sender, sender_id=None) -> dict:
+    effective_id = str(sender_id or 0)
     if not sender:
+        unknown_label = f"id:{effective_id}" if effective_id != "0" else "Unknown"
         return {
-            "id": "0",
+            "id": effective_id,
             "username": "",
             "display_name": "Unknown",
-            "label": "Unknown",
+            "label": unknown_label,
         }
     username = getattr(sender, "username", "") or ""
     display_name = (
@@ -71,8 +73,11 @@ def build_author(sender) -> dict:
         or "Unknown"
     )
     label = f"@{username}" if username else display_name
+    sender_obj_id = str(getattr(sender, "id", None) or sender_id or 0)
+    if label == "Unknown" and sender_obj_id != "0":
+        label = f"id:{sender_obj_id}"
     return {
-        "id": str(getattr(sender, "id", 0)),
+        "id": sender_obj_id,
         "username": username,
         "display_name": display_name,
         "label": label,
@@ -105,10 +110,14 @@ def extract_attachment(message) -> dict:
 
 async def send_to_n8n(message):
     sender = message.sender or await message.get_sender()
-    author = build_author(sender)
+    author = build_author(sender, message.sender_id)
     reply_message = await message.get_reply_message() if message.reply_to_msg_id else None
     reply_sender = await reply_message.get_sender() if reply_message else None
-    reply_author = build_author(reply_sender) if reply_sender else None
+    reply_author = (
+        build_author(reply_sender, getattr(reply_message, "sender_id", None))
+        if reply_message
+        else None
+    )
 
     data = {
         "text": message.text,