docs: @Override
      public synchronized void rollbackToSavepoint(String name) {
  
          if (isClosed) {
              return;
          }
  
          int index = sessionContext.savepoints.getIndex(name);
  
          if (index < 0) {
              throw Error.error(ErrorCode.X_3B001, name);
          }
  
          database.txManager.rollbackSavepoint(this, index);
  
          try {
              database.logger.writeToLog(this, getSavepointRollbackSQL(name));
          } catch (HsqlException e) {}
      }