Postgresql On Compute Node(s)?

Hello fellow HPCC users and admins,
Do I need to install Postgresql on the compute node(s) as well, or just the head node?

Just the head node. Only the pbspro-server RPM has a dependency on postgres:

[root@host x86_64]# rpm -qpR pbspro-execution-19.0.0-0.x86_64.rpm | grep sql
[root@host x86_64]# rpm -qpR pbspro-server-19.0.0-0.x86_64.rpm | grep sql
postgresql-contrib >= 9.1
postgresql-server >= 9.1

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