For a new type of architecture, to aggregate 2 or more Real Time Gateway database to a central database (A copy tag archiecture), an option or a device to expose all the tag of a database (memory and other) with the internal opc UA serveur of the gateway will be usefull feature.
Another solution could be to indicate a special OPC Item path (with Ignition OPC-UA Server) when creating the OPC Sql Tag in order to create a local memory value ?
These function could be usefull to exchange tag between 2 opc-ua system or scada…