Comment by levkk

1. Yup, we support online resharding, so you don't need to deploy this until you have to.

2. That's right, we broadcast the DDL to all shards in the configuration. If two-phase commit [1] is enabled, you have a strong guarantee that this operation will be atomic. The broadcast is done in parallel, so this is fast.

[1]: https://docs.pgdog.dev/features/sharding/2pc/