oh how i wish they were in azure. azure's postgresql flex offering is horrid. for some reason the HA standby instance can't be used as a read replica, it's filled with maintenance windows / downtime-ful upgrades / etc..
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In a less anti-competitive world you would be perfectly happy to use a database hosted in an Equinix facility or whatever next door. You could connect via a fractional 100Gbps link at a price multiple orders of magnitude below what Azure would actually charge for an equivalent amount of data transfer.