xos/core/models/sitedeployment.xproto

message SiteDeployment (PlCoreBase){
     required manytoone site->Site:sitedeployments = 1 [db_index = True, null = False, blank = False];
     required manytoone deployment->Deployment:sitedeployments = 2 [db_index = True, null = False, blank = False];
     optional manytoone controller->Controller:sitedeployments = 3 [db_index = True, null = True, blank = True];
     optional string availability_zone = 4 [max_length = 200, content_type = "stripped", blank = True, help_text = "OpenStack availability zone", null = True, db_index = False];
}