'bundle exec rake db:migrate' выполняется долго из-за миграции календаря

Поддержка Самостоятельное хостинг
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      DELETE
        FROM calendar_events ce
      WHERE
        ce.id IN (SELECT DISTINCT(ce3.id) FROM calendar_events ce2
                  LEFT JOIN calendar_events ce3 ON ce3.user_id = ce2.user_id AND ce3.description = ce2.description
                  WHERE ce2.start_date >= (ce3.start_date - INTERVAL '1 day')
                    AND ce2.start_date <= (ce3.start_date + INTERVAL '1 day')
                    AND ce2.timezone IS NOT NULL
                    AND ce3.timezone IS NULL
                    AND ce3.id != ce2.id
                    AND ce2.post_id IS NULL
                    AND ce3.post_id IS NULL
        )