fix(postgres): update document status with partial update instead of full upsert

lightrag/base.py

@@ -202,3 +202,7 @@ class DocStatusStorage(BaseKVStorage):
     async def get_pending_docs(self) -> dict[str, DocProcessingStatus]:
         """Get all pending documents"""
         raise NotImplementedError
+
+    async def update_doc_status(self, data: dict[str, Any]) -> None:
+        """Updates the status of a document. By default, it calls upsert."""
+        await self.upsert(data)