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What really interests me most is the sharding and the possibility of using this for multitenancy - is the hooks / plugin architecture sufficient so you can run a small sidecar to add shards or tenants to the TOML file dynamically? Would be a game changer.

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We found it pretty easy to build a little k8s controller for our own purposes to do this -- see https://news.ycombinator.com/item?id=48478994 . You probably don't need to implement this as a plugin or hook, pgdog supports dynamic reload of its configuration without dropping existing connections.

Although I'm the type to shy away from adding extra layers in my architectures when I can help it, pgdog has been an absolute breeze to use :)

Yes. The plugin architecture supports this currently. That being said, you can use any number of sharding functions we support to do this too.

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