fix: stop three recurring errors on doc delete (#17685) (#17686)

Follow-up to #17526 ("Refactor: merge dataset scope graph"), which introduced two code paths that touch Infinity columns the deployed schema does not declare. This PR makes the runtime robust against the old schema while also adding the new column to the new schema so freshly created tables are correct.

test/unit_test/api/db/services/test_doc_metadata_service.py

@@ -0,0 +1,77 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+"""Unit tests for ``DocMetadataService`` metadata lookup and deletion methods."""
+
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+pytestmark = pytest.mark.p2
+
+from api.db.services.doc_metadata_service import DocMetadataService
+
+
+class TestDocMetadataServiceConnectorGetCalls:
+    """Verify that ``DocMetadataService`` passes ``[]`` as knowledgebase_ids
+    when interacting with ``docStoreConn.get`` for per-tenant metadata indexes,
+    avoiding the creation of non-existent ``<tenant>_<kb>`` table names."""
+
+    def test_delete_document_metadata_passes_empty_kb_list_to_get(self):
+        mock_doc_store = MagicMock()
+        mock_doc_store.index_exist.return_value = True
+        mock_doc_store.get.return_value = None  # No metadata found
+
+        with (
+            patch("api.db.services.doc_metadata_service.settings") as mock_settings,
+            patch("api.db.db_models.DB.connect"),
+            patch("api.db.db_models.DB.connection_context"),
+        ):
+            mock_settings.docStoreConn = mock_doc_store
+
+            res = DocMetadataService.delete_document_metadata("doc_789", "kb_123", tenant_id="tenant_456")
+
+            assert res is True
+            mock_doc_store.get.assert_called_once_with(
+                "doc_789",
+                "ragflow_doc_meta_tenant_456",
+                [],
+            )
+
+    def test_get_document_metadata_passes_empty_kb_list_to_get(self):
+        mock_doc_store = MagicMock()
+        mock_doc_store.get.return_value = {"id": "doc_789", "meta_fields": {"author": "alice"}}
+
+        mock_doc = MagicMock()
+        mock_doc.knowledgebase.tenant_id = "tenant_456"
+        mock_doc.kb_id = "kb_123"
+
+        with (
+            patch("api.db.services.doc_metadata_service.settings") as mock_settings,
+            patch("api.db.services.doc_metadata_service.Document") as mock_document_model,
+            patch("api.db.db_models.DB.connect"),
+            patch("api.db.db_models.DB.connection_context"),
+        ):
+            mock_settings.docStoreConn = mock_doc_store
+            mock_document_model.select.return_value.join.return_value.where.return_value.first.return_value = mock_doc
+
+            result = DocMetadataService.get_document_metadata("doc_789")
+
+            mock_doc_store.get.assert_called_once_with(
+                "doc_789",
+                "ragflow_doc_meta_tenant_456",
+                [],
+            )
+            assert result == {"author": "alice"}