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Because e.g. for the following instance parameters

    <?xml version='1.0' encoding='utf-8'?>
    <instance>
      <parameter id="text">Привет Мир!</parameter>
    </instance>

we get the following DB query

    'UPDATE %s SET slap_state="busy" ,software_release=? ,partition_reference=? ,requested_by=? ,software_type=? ,xml=? WHERE
reference=? AND computer_reference=?',
    ['http://sr//', 'myinstance', 'slappart0', 'default',
     '<?xml version=\'1.0\' encoding=\'utf-8\'?>\n<instance>\n  <parameter id="text">\xd0\x9f\xd1\x80\xd0\xb8\xd0\xb2\xd0\xb5\xd1\x82\xd0\x9c\xd0\xb8\xd1\x80!</parameter>\n</instance>\n',
     'slappart6', 'computer']

which fails the following way:

  File ".../site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File ".../site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File ".../site-packages/flask/app.py", line 1381, in handle_u...