code: public void clearCheckSums() throws LiquibaseException {
          LOG.info(LogType.LOG, "Clearing database change log checksums");
          LockService lockService = LockServiceFactory.getInstance().getLockService(database);
          lockService.waitForLock();
  
          try {
              checkLiquibaseTables(false, null, new Contexts(), new LabelExpression());
  
              UpdateStatement updateStatement = new UpdateStatement(
                  getDatabase().getLiquibaseCatalogName(),
                  getDatabase().getLiquibaseSchemaName(),
                  getDatabase().getDatabaseChangeLogTableName()
              );
              updateStatement.addNewColumnValue("MD5SUM", null);
              ExecutorService.getInstance().getExecutor(database).execute(updateStatement);
              getDatabase().commit();
          } finally {
              try {
                  lockService.releaseLock();
              } catch (LockException e) {
                  LOG.severe(LogType.LOG, MSG_COULD_NOT_RELEASE_LOCK, e);
              }
          }
          resetServices();
      }
docs: Sets checksums to null so they will be repopulated next run