diff --git a/backend/src/services/dataset_review/event_logger.py b/backend/src/services/dataset_review/event_logger.py
index 53063261..d221bbda 100644
--- a/backend/src/services/dataset_review/event_logger.py
+++ b/backend/src/services/dataset_review/event_logger.py
@@ -1,4 +1,4 @@
-# [DEF:SessionEventLogger:Module]
+# [DEF:SessionEventLoggerModule:Module]
 # @COMPLEXITY: 4
 # @SEMANTICS: dataset_review, audit, session_events, persistence, observability
 # @PURPOSE: Persist explicit session mutation events for dataset-review audit trails without weakening ownership or approval invariants.
@@ -8,10 +8,11 @@
 # @PRE: Caller provides an owned session scope and an authenticated actor identifier for each persisted mutation event.
 # @POST: Every logged event is committed as an explicit, queryable audit record with deterministic event metadata.
 # @SIDE_EFFECT: Inserts persisted session event rows and emits runtime belief-state logs for audit-sensitive mutations.
+# @DATA_CONTRACT: Input[SessionEventPayload] -> Output[SessionEvent]
 
 from __future__ import annotations
 
-# [DEF:SessionEventLogger.imports:Block]
+# [DEF:SessionEventLoggerImports:Block]
 from dataclasses import dataclass, field
 from typing import Any, Dict, Optional
 
@@ -19,7 +20,7 @@ from sqlalchemy.orm import Session
 
 from src.core.logger import belief_scope, logger
 from src.models.dataset_review import DatasetReviewSession, SessionEvent
-# [/DEF:SessionEventLogger.imports:Block]
+# [/DEF:SessionEventLoggerImports:Block]
 
 
 # [DEF:SessionEventPayload:Class]
@@ -41,10 +42,11 @@ class SessionEventPayload:
 # @COMPLEXITY: 4
 # @PURPOSE: Persist explicit dataset-review session audit events with meaningful runtime reasoning logs.
 # @RELATION: [DEPENDS_ON] ->[SessionEvent]
-# @RELATION: [DEPENDS_ON] ->[sqlalchemy.orm.Session]
+# @RELATION: [DEPENDS_ON] ->[SessionEventPayload]
 # @PRE: The database session is live and payload identifiers are non-empty.
 # @POST: Returns the committed session event row with a stable identifier and stored detail payload.
 # @SIDE_EFFECT: Writes one audit row to persistence and emits logger.reason/logger.reflect traces.
+# @DATA_CONTRACT: Input[SessionEventPayload] -> Output[SessionEvent]
 class SessionEventLogger:
     # [DEF:SessionEventLogger.__init__:Function]
     # @COMPLEXITY: 2
@@ -153,4 +155,4 @@ class SessionEventLogger:
     # [/DEF:SessionEventLogger.log_for_session:Function]
 # [/DEF:SessionEventLogger:Class]
 
-# [/DEF:SessionEventLogger:Module]
\ No newline at end of file
+# [/DEF:SessionEventLoggerModule:Module]
\ No newline at end of file
diff --git a/backend/src/services/git_service.py b/backend/src/services/git_service.py
index 669937de..c16b13d6 100644
--- a/backend/src/services/git_service.py
+++ b/backend/src/services/git_service.py
@@ -65,7 +65,13 @@ class GitService:
         base = Path(self.base_path)
         if base.exists() and not base.is_dir():
             raise ValueError(f"Git repositories base path is not a directory: {self.base_path}")
-        base.mkdir(parents=True, exist_ok=True)
+        try:
+            base.mkdir(parents=True, exist_ok=True)
+        except (PermissionError, OSError) as e:
+            logger.warning(
+                f"[_ensure_base_path_exists][Coherence:Failed] Cannot create Git repositories base path: {self.base_path}. Error: {e}"
+            )
+            raise ValueError(f"Cannot create Git repositories base path: {self.base_path}. {e}")
     # [/DEF:backend.src.services.git_service.GitService._ensure_base_path_exists:Function]
 
     # [DEF:backend.src.services.git_service.GitService._resolve_base_path:Function]
diff --git a/backend/tests/services/dataset_review/test_superset_matrix.py b/backend/tests/services/dataset_review/test_superset_matrix.py
index a948a1e1..29ed3975 100644
--- a/backend/tests/services/dataset_review/test_superset_matrix.py
+++ b/backend/tests/services/dataset_review/test_superset_matrix.py
@@ -3,8 +3,8 @@
 # @SEMANTICS: dataset_review, superset, compatibility_matrix, preview, sql_lab, tests
 # @PURPOSE: Verifies Superset preview and SQL Lab endpoint fallback strategy used by dataset-review orchestration.
 # @LAYER: Tests
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.superset_client.SupersetClient]
 # @RELATION: [DEPENDS_ON] ->[SupersetCompilationAdapter]
-# @RELATION: [DEPENDS_ON] ->[SupersetClient]
 
 from types import SimpleNamespace
 from unittest.mock import MagicMock
@@ -23,6 +23,7 @@ from src.core.utils.superset_compilation_adapter import (
 # [DEF:make_adapter:Function]
 # @COMPLEXITY: 2
 # @PURPOSE: Build an adapter with a mock Superset client and deterministic environment for compatibility tests.
+# @RELATION: [DEPENDS_ON] ->[SupersetCompilationAdapter]
 def make_adapter():
     environment = SimpleNamespace(
         id="env-1",
@@ -42,6 +43,7 @@ def make_adapter():
 # [DEF:test_preview_prefers_supported_client_method_before_network_fallback:Function]
 # @COMPLEXITY: 2
 # @PURPOSE: Confirms preview compilation uses a supported client method first when the capability exists.
+# @RELATION: [DEPENDS_ON] ->[SupersetCompilationAdapter]
 def test_preview_prefers_supported_client_method_before_network_fallback():
     adapter, client = make_adapter()
     client.compile_preview = MagicMock(return_value={"compiled_sql": "SELECT 1"})
@@ -65,6 +67,7 @@ def test_preview_prefers_supported_client_method_before_network_fallback():
 # [DEF:test_preview_falls_back_across_matrix_until_supported_endpoint_returns_sql:Function]
 # @COMPLEXITY: 3
 # @PURPOSE: Confirms preview fallback walks the compatibility matrix from preferred to legacy endpoints until one returns compiled SQL.
+# @RELATION: [DEPENDS_ON] ->[SupersetCompilationAdapter]
 def test_preview_falls_back_across_matrix_until_supported_endpoint_returns_sql():
     adapter, client = make_adapter()
     payload = PreviewCompilationPayload(
@@ -95,6 +98,7 @@ def test_preview_falls_back_across_matrix_until_supported_endpoint_returns_sql()
 # [DEF:test_sql_lab_launch_falls_back_to_legacy_execute_endpoint:Function]
 # @COMPLEXITY: 3
 # @PURPOSE: Confirms SQL Lab launch falls back from modern to legacy execute endpoint and preserves canonical session reference extraction.
+# @RELATION: [DEPENDS_ON] ->[SupersetCompilationAdapter]
 def test_sql_lab_launch_falls_back_to_legacy_execute_endpoint():
     adapter, client = make_adapter()
     client.get_dataset.return_value = {