craigh/Tag — comment on commit 6e27adac8ff1042a2321af54ded169bb9bb0e471
File: src/modules/Tag/lib/Tag/Installer.php line 72
By Portugao:

Sorry. I thought in a wrong way.

Try to use DoctrineHelper::createSchema();

That's why there is no schema, if you upgrade from a non doctrine module ( hope is correct for 'Tag') to a doctrine module.
For me that works.