title: MySQL generating duplicate UUID
body: <p>I use the Mysql UUID() function to generate unique IDs. </p>
  
  <p>However, I have come across a situation where it has generated a duplicate UUID. I was under the impression that if the entries were done at separate times , that this would not occur. </p>
  
  <p>In this particular case, the insert queries were run a day apart and yet they have duplicated the UUID.</p>
  
  <p>I can't set the field index to <em>unique</em> to ensure uniqueness, so given that this has happened, how do I ensure that UUID is generating a unique ID?</p>