feat: add authenticated engine processing boundary

site/db/dossiers.py

@@ -7,7 +7,7 @@
 import json
 import uuid
 
-from db.connection import execute, query, transaction
+from db.connection import execute, query
 
 
 def _json_value(value, default):
@@ -123,5 +123,4 @@ def list_dossier_documents(dossier_id):
 
 def clear_batch_dossiers(batch_id):
     """Удалить все досье batch; таблицы с ON DELETE CASCADE очистятся вместе с ними."""
-    with transaction():
-        return execute("DELETE FROM contract_dossiers WHERE batch_id = %s", (batch_id,))
+    return execute("DELETE FROM contract_dossiers WHERE batch_id = %s", (batch_id,))