Code review comment for ~andersson123/autopkgtest-cloud:seed_new_release_neutral_results

I've amended the exitcode, I'm not sure we can speed up the script much. The swift connection checks for duplicates anyway and doesn't copy if one exists I believe, so an external check I don't think would add much. But there could be a way to change the SQL query which I think is what you were suggesting, but I'm not well versed enough in SQL to say.