Ruby on Rails

Hello,

DELETE e1

  FROM events e1

  JOIN events e2

 WHERE e1.subject_type = e2.subject_type

   AND e1.subject_id   = e2.subject_id

   AND e1.origin_type  = e2.origin_type

   AND e1.origin_id    = e2.origin_id

   AND e1.id > e2.id

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