def _get_service_call_first_timestamps_collection(self):
    db_client = MongoClient(self._db_config.MONGODB_URI)
    db = db_client[self._db_config.MONGODB_AD]
    return db.service_call_first_timestamps
def _get_service_call_first_timestamps_collection(self):
    db_client = MongoClient(self._db_config.MONGODB_URI)
    db = db_client[self._db_config.MONGODB_AD]
    return db.service_call_first_timestamps