ETL 完成

etl_billiards/api/local_json_client.py

@@ -20,6 +20,10 @@ class LocalJsonClient:
         if not self.base_dir.exists():
             raise FileNotFoundError(f"JSON 目录不存在: {self.base_dir}")
 
+    def get_source_hint(self, endpoint: str) -> str:
+        """Return the JSON file path for this endpoint (for source_file lineage)."""
+        return str(self.base_dir / endpoint_to_filename(endpoint))
+
     def iter_paginated(
         self,
         endpoint: str,