Corey Quinn from Last Week in AWS jokes about using Route53 as a db often, including this hilarious twitter thread [0].
[0] https://twitter.com/quinnypig/status/1120653859561459712
[0] https://twitter.com/quinnypig/status/1120653859561459712
Source: Principal at AWS, worked on route 53 for a few years.
sounds like another good candidate for distributed TimeSeries DB or DHT type of things.