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There's a lot of good ecosystem stuff around this:
https://github.com/HypoPG/hypopg
HypoPG is a PostgreSQL extension adding support for hypothetical indexes.
An hypothetical -- or virtual -- index is an index that doesn't really exists, and thus doesn't cost CPU, disk or any resource to create. They're useful to know if specific indexes can increase performance for problematic queries, since you can know if PostgreSQL will use these indexes or not without having to spend resources to create them.
With one approach to using it here: https://www.percona.com/blog/2019/07/22/automatic-index-reco...
Here's a database that does much better than this, it creates and fine-grainedly updates materialized views of the queries you're using: https://github.com/mit-pdos/noria
Here's an excellent interview with the creator: https://corecursive.com/030-rethinking-databases-with-jon-gj...