@property
    def unique_storage_type(self):

        if len(self.storage_types) == 1:
            return list(self.storage_types)[0]
        else:
            return None
Return storage type if there is only one. This should always return a type in relational
dataset/ETHPy150Open Stiivi/brewery/brewery/probes.py/ValueTypeProbe.unique_storage_type