title: Would you add an owner_id in the parent table or a is_owner in the child table?
body: <p>Let's say you have a table </p>
  
  <pre><code>collection
      id
      name
  </code></pre>
  
  <p>and a table</p>
  
  <pre><code>collection_collaborator
      id
      user_id
  </code></pre>
  
  <p>Would you add an owner_id in parent table?</p>
  
  <pre><code>collection
      id
      name
      owner_id
  </code></pre>
  
  <p>Would you add a is_owner on child table??</p>
  
  <pre><code>collection_collaborator
      id
      name
      is_owner
  </code></pre>