Duplicate key error on switching services

[ph448]

This seems to only happen to services switching multiple times, we get:

IntegrityError at /switch_services/352/
duplicate key value violates unique constraint "apimws_ansibleconfiguration_service_id_57c01285a0290788_uniq"
DETAIL:  Key (service_id, key)=(703, backup_first_date) already exists.

This means that

mws-panel/mws/sitesmanagement/models.py

Lines 286 to 287 in 0abdf86

	AnsibleConfiguration.objects.update_or_create(service=test_service, key="backup_first_date",
	value=date.today().isoformat())

fails.