README states 9.3+ is required. But using 9.4.18 I am seeing errors in Jobs::UpdateUsername
PG::UndefinedFunction: ERROR: function jsonb_build_object(unknown, text, unknown, text, unknown, text, unknown, text) does not exist
LINE 4: jsonb_build_object(
It appears that jsonb_build_object was added in 9.5
Standard install:
# psql --version
psql (PostgreSQL) 10.3 (Ubuntu 10.3-1.pgdg16.04+1
That’s what I’d recommend. You can search here, but I think 10 is required.
I’ve updated README.md and a few other docs, Thanks @tmm1 
I’ve just bumped it from 9.3 to 9.5 for now because Ubuntu 16.04 still ships with 9.5 
We should really point to 10, since it’s what we use on every install.
PostgreSQL officially supports Ubuntu 16.04: Apt - PostgreSQL wiki
Sure, I’ll change it back to 10!
I chose 9.5 because on a fresh 16.04 droplet:
apt install postgres → installs 9.5
apt install postgres-10 → doesn’t have an installation candidate
so our instructions here will not work on 16.04:
https://github.com/discourse/discourse/blob/master/docs/DEVELOPER-ADVANCED.md#preparing-a-fresh-ubuntu-install
Can I update that guide to say Postgres 10 & Ubuntu 18.04?
Yes, the guide should point to the official PostgreSQL docs for installation, so it will work in any distro/version.
Awesome, it is done: https://github.com/discourse/discourse/commit/0dd98982ebc1c44c81d6d3d441a9374893bc58c2 