Add endpoint to set broadcast service channel

app/dao/service_broadcast_settings_dao.py

@@ -0,0 +1,15 @@
+from app import db
+from app.models import ServiceBroadcastSettings
+from app.dao.dao_utils import transactional
+
+
+@transactional
+def insert_or_update_service_broadcast_settings(service, channel, provider_restriction=None):
+    if not service.service_broadcast_settings:
+        settings = ServiceBroadcastSettings()
+        settings.service = service
+        settings.channel = channel
+        db.session.add(settings)
+    else:
+        service.service_broadcast_settings.channel = channel
+        db.session.add(service.service_broadcast_settings)