260327-窗口迭代逻辑修复，不是每天只跑一条

main.py

@@ -403,7 +403,8 @@ async def scrape_one_source(
             f"[{source_key}] 窗口增量模式 start={start_dt} end={end_dt} (UTC), "
             f"message_id > {last_id}"
         )
-        iterator = client.iter_messages(entity, min_id=last_id, reverse=True)
+        # reverse=False: 从新到旧遍历，结合时间窗口可快速终止，避免扫全量历史。
+        iterator = client.iter_messages(entity, min_id=last_id, reverse=False)
     else:
         last_id = store.get_last_message_id(source_key)
         logger.info(f"[{source_key}] 增量模式，从 message_id > {last_id} 开始")
@@ -411,6 +412,10 @@ async def scrape_one_source(
 
     async for message in iterator:
         scanned += 1
+        msg_id = int(message.id)
+        if msg_id > max_seen_id:
+            max_seen_id = msg_id
+
         message_dt = message.date.astimezone(timezone.utc)
 
         if window_mode:
@@ -419,16 +424,12 @@ async def scrape_one_source(
             if start_dt and message_dt < start_dt:
                 break
 
-        msg_id = int(message.id)
         msg_date = message_dt.strftime("%Y-%m-%d %H:%M:%S")
         content = build_message_content(message)
 
         if store.save_message(source_key, chat_id, msg_id, content, msg_date):
             inserted += 1
 
-        if msg_id > max_seen_id:
-            max_seen_id = msg_id
-
         if scanned % 200 == 0:
             logger.info(f"[{source_key}] 进度: 扫描 {scanned} 条, 新增 {inserted} 条")
 
@@ -441,6 +442,12 @@ async def scrape_one_source(
         if max_seen_id > old_last:
             store.set_last_message_id(source_key, max_seen_id)
 
+    if window_mode and scanned <= 1:
+        logger.warning(
+            f"[{source_key}] 本次仅扫描 {scanned} 条消息，请检查源最近是否活跃，"
+            "或确认 time_window 配置与系统时钟是否正确。"
+        )
+
     logger.info(f"[{source_key}] 完成: 扫描 {scanned} 条, 新增 {inserted} 条")