docs: @Deactivate
      protected void deactivate() {
  
          if (psu != null) {
              try {
                  psu.close();
              } catch (Exception e) {
                  // FFDC.
              }
          }
  
          logger.log(Level.INFO, "persistence.service.status", new Object[] { "JPA", "deactivated" });
      }