<p>Oh, I think I've figured it out. In some places in the tests, we do things like</p>

<pre><code>def test_something
  trace = Trace.create
  [...]
  trace.destroy
end
</code></pre>

<p>If the created trace has an id <= 10 , then one of the fixture files from will be deleted. Gah. So it's not only execution-order-dependent, it only happens with the primary key sequence is reset, which is why I was struggling to reproduce it locally.</p>

<p>I'll need to think about this, suggestions welcome.</p>

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