[linda]

Yes, custom keys can be added to both the "cdbBlobs" and "cdbUsers" tables. One of our data servers in London was down recently, so that may have been the issue you ran into when modifying your table. Error messaging in the software when such cases occur can be improved to better notify the user.

Thank you for the additional feedback regarding the issues you face with batch uploading blobs. I'll forward them to the rest of the team.