Approach for multiple schema architecture

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Hello,
For context, our system is built using multiple schema approach (1 schema per client), and we are using MySQL by the way. The number of clients are ~700. So that's roughly 700 schemas. However, the version and structure are guaranteed to be the same for each clients.

We are trying to move forward to using GraphQL for internal communication between services, and stumble upon GraphJin, and so we gave it a try.

However, it seems an instance of GraphJin cannot start without selecting a database first. And even then, it also seems to not having any way to modify the resulting query to change schema on request basis.

So, the only option is to create an instance of GraphJin per database? which is pretty costly.
Any suggestion?

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However, it seems an instance of GraphJin cannot start without selecting a database first. And even then, it also seems to not having any way to modify the resulting query to change database on request basis.

My bad. It is in fact, able to change resulting query's schema using directive.

Kudos for the work, GraphJin team.