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>The docs, sort of, are already ready in the IBRest codes, they already contain the SQL's and to an extent it does the job. Does your API return database handle for further working as would in a Deplhi progam?

Nope. It just creates it.
But you can use ODBC after is created to connect and run DDL commands on it.
The driver has clauses for connections that creates database if don't exists on server, and keeps connection opened to it.