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I remember reading that Clickhouse is quite bad at joins, which can be important if you have to build a snowflake schema. Is that still true? Is this something TimescaleDB would be better at?

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In this case PostgreSQL may be able to come to the rescue :)

There is Clickhouse FDW for PostgreSQL which in some cases can provide great speed with full join support

https://github.com/adjust/clickhouse_fdw

yes, to take this a bit further, I love the idea that no matter what db is best, Postgres can be the starting point for all queries.

If you data to join looks like not very huge dictionaries[1] (locations, types, etc) then ClickHouse can show amazing speeds. I had no any problems with a speed of usual joins though.

[1] https://clickhouse.com/docs/en/sql-reference/dictionaries/

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