Here's where the partitioning is really useful: we can simply drop the old partition which means we don't see any autovacuum pressure caused by row updates. To do this safely, we acquire a lock on the partition tables in ACCESS EXCLUSIVE MODE, drop the old partition and triggers, rename the new partition, and attach it to the parent table as a replacement for the prior partition.
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exiftool -p gps_format.fmt -ee3 GRMN.MP4 gps.tmp
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