Disclaimer: I work at Google.<p>Have you looked at Google at all? Cloud Bigtable runs the whole of Google&#x27;s Advertising Business and could scale per your requirements.<p><a href="https:&#x2F;&#x2F;cloud.google.com&#x2F;bigtable&#x2F;docs&#x2F;" rel="nofollow">https:&#x2F;&#x2F;cloud.google.com&#x2F;bigtable&#x2F;docs&#x2F;</a>