diff --git a/layer/nrlf/core/dynamodb/repository.py b/layer/nrlf/core/dynamodb/repository.py
index 26a36deef..7c2ef6954 100644
--- a/layer/nrlf/core/dynamodb/repository.py
+++ b/layer/nrlf/core/dynamodb/repository.py
@@ -344,6 +344,7 @@ def delete_by_id(self, id_: str, can_ignore_delete_fail: bool = False):
         key = f"D#{id_}"
         try:
             self.table.delete_item(Key={"pk": key, "sk": key})
+            logger.log(LogReference.REPOSITORY027, id=id_)
         except Exception as exc:
             if can_ignore_delete_fail:
                 logger.log(
@@ -352,6 +353,13 @@ def delete_by_id(self, id_: str, can_ignore_delete_fail: bool = False):
                     stacklevel=5,
                     error=str(exc),
                 )
+            else:
+                raise OperationOutcomeError(
+                    status_code="500",
+                    severity="error",
+                    code="exception",
+                    details=SpineErrorConcept.from_code("INTERNAL_SERVER_ERROR"),
+                ) from exc
 
     def _query(self, **kwargs) -> Iterator[DocumentPointer]:
         """
diff --git a/layer/nrlf/core/dynamodb/tests/test_repository.py b/layer/nrlf/core/dynamodb/tests/test_repository.py
index 75a8b605d..387df8d0d 100644
--- a/layer/nrlf/core/dynamodb/tests/test_repository.py
+++ b/layer/nrlf/core/dynamodb/tests/test_repository.py
@@ -1,7 +1,33 @@
+from unittest.mock import patch
+
 import pytest
+from moto import mock_aws
 
 from nrlf.core.constants import PointerTypes
-from nrlf.core.dynamodb.repository import _get_sk_ids_for_type
+from nrlf.core.dynamodb.model import DocumentPointer
+from nrlf.core.dynamodb.repository import (
+    DocumentPointerRepository,
+    _get_sk_ids_for_type,
+)
+from nrlf.core.errors import OperationOutcomeError
+from nrlf.core.log_references import LogReference
+from nrlf.tests.data import load_document_reference
+from nrlf.tests.dynamodb import mock_repository
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+
+def make_document_pointer(id: str = "Y05868-99999-99999-999999") -> DocumentPointer:
+    doc_ref = load_document_reference("Y05868-736253002-Valid")
+    doc_ref.id = id
+    return DocumentPointer.from_document_reference(doc_ref)
+
+
+# ---------------------------------------------------------------------------
+# _get_sk_ids_for_type
+# ---------------------------------------------------------------------------
 
 
 def test_get_sk_ids_for_type_exception_thrown_for_invalid_type():
@@ -30,4 +56,97 @@ def test_get_sk_ids_for_type_exception_thrown_if_new_type_has_no_category():
     )
 
 
-# TODO: Add unit tests for Repository Class
+# ---------------------------------------------------------------------------
+# DocumentPointerRepository.supersede
+# ---------------------------------------------------------------------------
+
+
+@mock_aws
+@mock_repository
+def test_supersede_creates_new_and_deletes_old(repository: DocumentPointerRepository):
+    old_doc = make_document_pointer(id="Y05868-OLD0001")
+    repository.create(old_doc)
+    assert repository.get_by_id("Y05868-OLD0001") is not None
+
+    new_doc = make_document_pointer(id="Y05868-NEW0001")
+    result = repository.supersede(new_doc, ids_to_delete=["Y05868-OLD0001"])
+
+    assert result.id == "Y05868-NEW0001"
+    assert repository.get_by_id("Y05868-NEW0001") is not None
+    assert repository.get_by_id("Y05868-OLD0001") is None
+
+
+@mock_aws
+@mock_repository
+@patch("nrlf.core.dynamodb.repository.logger")
+def test_supersede_with_can_ignore_delete_fail(
+    mock_logger,
+    repository: DocumentPointerRepository,
+):
+    new_doc = make_document_pointer(id="Y05868-NEW0003")
+
+    with patch.object(
+        repository.table,
+        "delete_item",
+        side_effect=Exception("simulated delete failure"),
+    ):
+        result = repository.supersede(
+            new_doc,
+            ids_to_delete=["Y05868-NONEXISTENT"],
+            can_ignore_delete_fail=True,
+        )
+
+    assert result.id == "Y05868-NEW0003"
+    log_codes = [c.args[0] for c in mock_logger.log.call_args_list]
+    assert LogReference.REPOSITORY026a in log_codes
+
+
+# ---------------------------------------------------------------------------
+# DocumentPointerRepository.delete_by_id
+# ---------------------------------------------------------------------------
+
+
+@mock_aws
+@mock_repository
+def test_delete_by_id_removes_document_pointer(repository: DocumentPointerRepository):
+    doc = make_document_pointer()
+    repository.create(doc)
+    assert repository.get_by_id(doc.id) is not None
+
+    repository.delete_by_id(doc.id)
+
+    assert repository.get_by_id(doc.id) is None
+
+
+@mock_aws
+@mock_repository
+def test_delete_by_id_raises_error_when_can_ignore_delete_fail_is_false(
+    repository: DocumentPointerRepository,
+):
+    with patch.object(
+        repository.table,
+        "delete_item",
+        side_effect=Exception("simulated delete failure"),
+    ):
+        with pytest.raises(OperationOutcomeError) as exc_info:
+            repository.delete_by_id("Y05868-NONEXISTENT", can_ignore_delete_fail=False)
+
+    assert exc_info.value.status_code == "500"
+
+
+@mock_aws
+@mock_repository
+@patch("nrlf.core.dynamodb.repository.logger")
+def test_delete_by_id_ignores_error_when_can_ignore_delete_fail_is_true(
+    mock_logger,
+    repository: DocumentPointerRepository,
+):
+    with patch.object(
+        repository.table,
+        "delete_item",
+        side_effect=Exception("simulated delete failure"),
+    ):
+        repository.delete_by_id("Y05868-NONEXISTENT", can_ignore_delete_fail=True)
+
+    log_codes = [c.args[0] for c in mock_logger.log.call_args_list]
+    assert LogReference.REPOSITORY026a in log_codes