couchbase-cli doesn't provide possibility to set Metadata Purge Interval (days):

setting-compaction doesn't have such option

setting-compaction OPTIONS:
--compaction-db-percentage=PERCENTAGE at which point database compaction is triggered
--compaction-db-size=SIZE[MB] at which point database compaction is triggered
--compaction-view-percentage=PERCENTAGE at which point view compaction is triggered
--compaction-view-size=SIZE[MB] at which point view compaction is triggered
--compaction-period-from=HH:MM allow compaction time period from
--compaction-period-to=HH:MM allow compaction time period to
--enable-compaction-abort=[0|1] allow compaction abort when time expires
--enable-compaction-parallel=[0|1] allow parallel compaction for database and view