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Hm, that can be done now with pg_cron(available on Supabase):
https://github.com/citusdata/pg_cron#what-is-pg_cron

But a pg extension that's simpler to use(only focused on TTL) could be developed 🤔

That's certainly something I've considered doing, but pg_cron is fairly easy to configure.

Perhaps an external tool where you provide a config (json, yml) listing tables and their respective TTL, and it runs a pg_cron query to set it up automatically