List<cxsrec__cxsCandidate__c> candidates = new List<cxsrec__cxsCandidate__c>();
for(Integer i = 0; i<150; i++) {
    candidates.add(new cxsrec__cxsCandidate__c(
            cxsrec__Last_name__c = 'Test' + i,
            cxsrec__First_name__c = 'Anonymisierung noch nicht abgelaufen' + i,
            cxsrec__Date_of_birth__c = Date.newInstance(2017, 1, 1),
            cxsrec__E_mail_address__c = '1anontest@test.xysz',
            cxsrec__Mobile_phone__c ='+491221211',
            Anonymization_Status__c = 'Anonymization in 6 days',
            Eingangsdatum_Email_Einverst_ndnis__c = Date.today() - 750,
            ExistsInTalentPool__c = false,
            Brand__c = 'AMS'
    ));
}

insert candidates;