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Sounds great. So I just manually execute this `compress_chunks` command once on each data node and then I have compression enabled forever on those nodes?

Not yet, I should have been clearer:

compress_chunk operates on a single chunk, the way to define "compress all chunks older than 1 week is":

   SELECT compress_chunk(i) from show_chunks('conditions', older_than => INTERVAL '1 week'); 

So you'd need to setup a cron job that runs that script every night or something...at least until we release compression policy support.

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