Connect to the OpManager DB remotely (PGSQL)

Connect to the OpManager DB remotely (PGSQL)

Hi,

I need to connect to the OpManager PGSQL DB from a remote server.
Could you tell me how I can do that? 
Is the connection from external server permitted?
What is the DB name? (it should be OpManager DB)
What is the port?
What is the username/password?

Is it possible to have the DB ER schema of the release 11.6?

Thanks,
Roberto.
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