Creates a new ServerClient.
The pg Client instance
Create a new database catalog only if it does not already exist.
The database catalog to create
A Promise that resolves when the operation completes
Execute a grant statement.
The grant to perform
A Promise that resolves when the operation completes
Create a new login only if it does not already exist.
The login to create
A Promise that resolves when the operation completes
A connection to the "postgres" database on a PostegreSQL server.