[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/