diff --git a/requirements-light.txt b/requirements-light.txt
deleted file mode 100644
index f105052..0000000
--- a/requirements-light.txt
+++ /dev/null
@@ -1,12 +0,0 @@
-temporalio
-psycopg2-binary
-sqlalchemy
-asyncua
-redis
-git+ssh://git@github.com/Aignosi/sientia-dataops-library.git@1.12.0
-prometheus-client
-botocore
-boto3
-s3fs
-pyarrow
-mlflow
\ No newline at end of file
diff --git a/tests/conftest.py b/tests/conftest.py
index e46ac68..eb23f39 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -3,6 +3,19 @@ import os
 from sientia_do.temporal.activities.postgres_sync import Postgres
 
 
+def _noop_postgres_del(_self):
+    """
+    Unit tests use MagicMock metrics controllers; postgres_sync.Postgres.__del__ calls
+    close() during GC and triggers async shutdown. Explicit ``close()`` is covered in tests.
+    """
+    return None
+
+
+Postgres.__del__ = _noop_postgres_del  # type: ignore[method-assign]
+
+from sientia_do.temporal.activities.postgres_sync import Postgres
+
+
 def _noop_postgres_del(_self):
     """
     Unit tests use MagicMock metrics controllers; postgres_sync.Postgres.__del__ calls