code: def ensure_table(self, cls):
          
          cur = self._conn().cursor()
  
          table_name = cls.get_table_name()
          index_names = cls.index_names() or []
  
          cols = ['id text primary key', 'value text']
          for name in index_names:
              cols.append(name + ' text')
  
          cur.execute('create table if not exists %s (%s)' % (
              table_name,
              ','.join(cols)
          ))
  
          for name in index_names:
              cur.execute('create index if not exists %s on %s(%s)' % (
                  table_name + '_' + name + '_idx',
                  table_name,
                  name
              ))
  
          self._conn().commit()
          cur.close()
docs: Ensure table's existence - as per the gludb spec.