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")
 
 

run_daily_incremental.sh

@@ -25,6 +25,27 @@ if [[ ! -x "$PY_BIN" ]]; then
   exit 1
 fi
 
+# Dependency preflight (avoid silent runtime failures after cron upgrades)
+if ! "$PY_BIN" - <<'PY' >> "$LOG_DIR/daily_job.log" 2>&1
+import importlib
+missing = []
+for name in ("telethon", "pymysql", "cryptography"):
+    try:
+        importlib.import_module(name)
+    except Exception:
+        missing.append(name)
+
+if missing:
+    print(f"missing python packages: {', '.join(missing)}")
+    raise SystemExit(1)
+
+print("python dependency preflight passed")
+PY
+then
+  echo "[$(date '+%Y-%m-%d %H:%M:%S')] dependency preflight failed, exit" >> "$LOG_DIR/daily_job.log"
+  exit 1
+fi
+
 # Auto-advance time window to a rolling daily range.
 "$PY_BIN" - <<'PY'
 import json