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Document URL: 

Section Number and Name: 

Describe the issue: 
When using an External DB setup, users need to create the "HStore" extension manually on their setups, as our installer can't handle this for them.

For fresh installs this means: postgresql-contrib needs to be installed and "create extension hstore" needs to be executed *before* the installation is attempted
For uphgrades this means: the same steps need to be executed *before* the upgrade is attempted (they can happen at any time before the upgrade, as the installation of the extension happens without a downtime).

Suggestions for improvement: 
https://github.com/theforeman/foreman-documentation/pull/2573

Additional information: 
the installation of postgresql contrib for fresh installs was already handled in https://github.com/theforeman/foreman-documentation/pull/2277 and https://github.com/theforeman/foreman-documentation/pull/2567

→ MODIFIED
doc PRs merged