code: def add_kb_mapping(kb_name, key, value=""):
      
      kb = get_kb_by_name(kb_name)
      if key in kb.kbrvals:
          # update
          kb.kbrvals[key].m_value = value
      else:
          # insert
          kb.kbrvals.set(models.KnwKBRVAL(m_key=key, m_value=value))
docs: Add a new mapping to given kb.
  
      :param kb_name: the name of the kb where to insert the new value
      :param key: the key of the mapping
      :param value: the value of the mapping