[dataimport] backport massive store from dataio cube Some tweaks have been made to work with 3.21 foreign key constraints. Also test are not executed in our own pg cluster instead of polluting the system one. Closes #5414760

sync_schema_props_perms('cwuri')

helper = repo.system_source.dbhelper
cu = session.cnxset.cu
helper.set_null_allowed(cu, 'moved_entities', 'extid', 'VARCHAR(256)', False)

commit()