I don’t run imports on production servers with sidekiq running, emails being sent, etc. You definitely want to see what the imported data looks like before going into production with it. Every import is a special snowflake with its own surprises and requirements.
If you are running an import onto a live production site, disable emails in settings, or add this to the initialize method of your script:
SiteSetting.disable_emails = true
and you’ll probably have other setting you’ll want to change.