Fixed slash problem in pims_split alembic file

shared/workspaces/alembic/versions/e8e6d54d8444_add_pimscache_split_workflow.py

@@ -211,8 +211,16 @@ def upgrade():
         VALUES ('write_finished_file.sh', E'{write_finished_file_sh}', 'pims_split')
         """
     )
-    pass
 
 
 def downgrade():
-    pass
+    op.execute(
+        """
+        DELETE FROM workflows WHERE workflow_name = 'pims_split'
+        """
+    )
+    op.execute(
+        """
+        DELETE FROM workflow_templates WHERE workflow_name = 'pims_split'
+        """
+    )