title: ERROR: null value in column "interaction_id" violates not-null constraint
body: <p>Help.  Please.  </p>
  
  <p>Error occurs with table, sequence, and either of the commands shown below.  It's the old story, it worked, I cleared the DB to get ready for a demo, and ....</p>
  
  <pre><code>CREATE SEQUENCE interaction_seq;
  CREATE TABLE IF NOT EXISTS Interact (
       webRequest text NOT NULL,
       interaction_id integer DEFAULT nextval('interaction_seq'),
       cTime timestamp without time zone DEFAULT now() ,
       uid integer default NULL,
       successful boolean default(false)
  );
  insert into interact values ('::COOKIE::::',DEFAULT);
  insert into interact values ('::COOKIE::::');
  </code></pre>
  
  <p>Seems to me the first, at least, should work.  </p>
  
  <p>Help greatly appreciated.</p>