The Importer tool is of very ppor quality
I just want to highlight the fact that importing via the csv is very poor and makes me think this was a rushed job.
1. It truncates coupon_titles if it has a $ or £ sign it
2. Does not automatically create unique coupon IDs. On the list of all the other fixes, I don't have the time to try and figure out how to create an automatically generated coupon id.
3. To avoid confusion and possible errors, you really should have kept importing of stores and importing of coupons separate.