* BRIN indexes are great for append only with an incremental value (a 50MB instead of 100GB index in timeseries data in my case)

* If your disks are ssd and scsi in different volumes, adapt the random cost of io in the config to let the planner now

* if you have RAID controller and a Battery-Backed Write Cache (BBWC), you can disable Linux filesystem write barriers. removing excessive fsync from the mouth of the psql demigod in SoCaL ~linux 2015, Bruce Momjian IIRC

* monitor disk usage, in backups pipe to gz, never to disk

* counter-intuitevely modern hardware may have an io bottleneck and plenty of cpu, so try Filesystems like ZFS using Zstandard (zstd), for boost in your Transactions per second

* if possible, schema multitenancy instead of database multitenancy, instagram talked about this decades ago

* indexes index functions results too, precompute those fields and partial indexes help a lot

* BM25 and FTS in pg are so good you probably don't need Elasticsearch and you will save a lot in de-sync between both of them

* you may be hacked in this brave new world post Mythos, thus, learn PITR to an external only write, no override medium like S3