Hey. Here are the mssqlserver backend files my org is using for their old roundup issue tracker install. I'm not sure if back_mssqlserver.pyc or _old.pyc would be of interest to you, but I've included them just in case.

I have no expectation for anyone to convert this backend for python3 and newer versions of issue tracker for me. But if you'd like, you can use this as reference to implement an mssqlserver backend alternative for future versions. We don't own this and I don't believe it was anyone in my org wrote who it. Maybe modified.

Thanks for all your help!