Niceness is an ENUM<p><pre><code>  &#x27;not known&#x27;,
  &#x27;nice&#x27;,
  &#x27;naughty&#x27;,
  &#x27;nasty&#x27;
</code></pre>
Additionally, the nice list is a bitemporal table, and CheckStatus is also an ENUM ( &#x27;nunce&#x27;, &#x27;once&#x27;, &#x27;twice&#x27;, &#x27;more&#x27; ).  Foreign keys go to the Person and Elf tables.