def update_first_timestamps(self, field, value, service_calls=None):
    scft = self._get_service_call_first_timestamps_collection()
    scft.update({'$or': service_calls.to_dict(orient='records')}, {'$set': {field: value}}, upsert=False, multi=True)
def update_first_timestamps(self, field, value, service_calls=None):
    scft = self._get_service_call_first_timestamps_collection()
    scft.update({'$or': service_calls.to_dict(orient='records')}, {'$set': {field: value}}, upsert=False, multi=True)