[neoden]

One could use a trigger for this. All we need is to setup a trigger that would delete all expired records looking at some timestamp column on update. That would eat up some latency but as was said, most projects would find it good enough anyway.

[dmitry-vsl]

Probably better to use partitioned table and drop old partitions.

[nhumrich]

I use pg cron for this. But I don't have a need for TTL to be to the minute accurate, or even to the hour.