[OSM-dev] Read-only API calls, fair usage

[Darafei "Komяpa" Praliaskouski]

>
> There's no guarantee that the read-only changeset call will go to the same
> backend server as the write call.
> https://github.com/openstreetmap/iD/issues/1646 shows the problem caused
> by iD not parsing the diff response and relying on redownloading.
>

This suggests that currently apidb replicas aren't in synchronous mode. Can
it be switched to synchronous?

https://www.postgresql.org/docs/9.5/static/warm-standby.html#SYNCHRONOUS-REPLICATION
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