fix(优先组): #18 密钥明文直配 config(弃 .env 依赖)；#5 appearances 改 distinct 视频数覆盖校准(防 reconcile 累加膨胀)；#9 oracle_sync 拉取加锁防 trigger_now 与后台并发双拉；#11 LLM 合并命名解析 target 已有 canonical(统一显示名)

fam-core/src/fam_core/oracle_sync.py

@@ -49,10 +49,16 @@ class OracleSync:
         self._last_sync_at = None
         self._last_error = None
         self._last_count = None
+        # 拉取互斥锁：trigger_now（命名后即时拉回）与后台 _run 并发时只允许一个执行
+        self._pull_lock = threading.Lock()
 
     # ------------------------------------------------------------------
     def _pull_once(self) -> bool:
-        """执行一次增量拉取。返回是否成功。"""
+        """执行一次增量拉取（加锁防并发双拉）。返回是否成功。"""
+        with self._pull_lock:
+            return self._pull_once_locked()
+
+    def _pull_once_locked(self) -> bool:
         since = db_layer.get_sync_cursor() or ''
         params = {'since': since, 'token': self.token}
         try: