[odb-users] Containers of containers

[MM]

Hellom

Trying to compile and understand the experimental facility of vectors of
vectors, I can't odb compile  the example here
https://cppget.org/odb/2.5.0-b.23?f=full#description
around odb/nested-container.hxx

first it complains about no id.

and then after I place no_id on the object,

1.hpp:16:29: error: unable to map C++ type '::package::licenses_type' used
in data member 'license_alternatives' to a PostgreSQL database type
1.hpp:16:29: info: use '#pragma db value_type' to specify the database type

What's involved to get the example to work?

Rds,