db: stop messing with convert_unicode in .ini and db scheme convert_unicode=False is the default for String fields ... except when the .ini file contains sets it to True. String fields are however no longer used for unicode and we can drop convert_unicode everywhere. See http://docs.sqlalchemy.org/en/latest/core/type_basics.html#sqlalchemy.types.String.params.convert_unicode for the advice of never setting convert_unicode.