Create db-migrator script for postgres

Policy 18/11-01/12, Policy 02/12-15/12, Policy 18/01/22-31/01/22, Policy 08/02/22-01/03/22, Policy 02/03/22-16/03/22, Policy 16/03/22-30/03/22, Policy 30/03/22-13/04/22, Policy 13/04/22-27/04/22