code: def ensure_table(self, cls):
          
          id_len = len(uuid())
          index_names = cls.index_names() or []
          cols = [
              'id char(%d) primary key' % (id_len,),
              'value jsonb'
          ] + [
              name + ' text' for name in index_names
          ]
  
          table_name = cls.get_table_name()
  
          with self._conn() as conn:
              with conn.cursor() as cur:
                  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
                      ))
docs: Ensure table's existence - as per the gludb spec.