I've already tried not specifying a name - in that case it's `anon_2` in the error.
Here's an MCVE: https://gist.github.com/ThiefMaster/593e5a78f08d6323eb1b88270256baa7 -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.