Not possible to create demo dataset with php artisan db:seed --class=DemoDataSeeder about core

[ikzent]

The issue commes from the following issues.
When the database is created all the tables, definitions labels ... was created with non null constraints.
When inserting records in the different tables the datatank tries to create first the record without any fields and updates in the second instance the records with the correct fields.
Postgres does not accept to insert the records without the proper restrictions and this result in failing inserting the records.
The mysql database has probably other restrictions.
A short term solution is to loosen the database definitions, the better solution is to insert in one insert not in two inserts