prepare metrics writing process

tests/test_pipelines.py

@@ -9,6 +9,9 @@ from delta_barth import pipelines as pl
 from delta_barth.errors import STATUS_HANDLER
 
 
+def test_write_performance_metrics(session): ...
+
+
 @patch("delta_barth.analysis.forecast.SALES_BASE_NUM_DATAPOINTS_MONTHS", 1)
 def test_sales_prognosis_pipeline(exmpl_api_sales_prognosis_resp):
     with patch(