docs: void removeExportedKeys(Table toDrop) {
  
          // toDrop.schema may be null because it is not registerd
          Schema schema = (Schema) schemaMap.get(toDrop.getSchemaName().name);
  
          for (int i = 0; i < schema.tableList.size(); i++) {
              Table table = (Table) schema.tableList.get(i);
  
              for (int j = table.constraintList.length - 1; j >= 0; j--) {
                  Table refTable = table.constraintList[j].getRef();
  
                  if (toDrop == refTable) {
                      table.removeConstraint(j);
                  }
              }
          }
      }