The "already exists" error is because a volume named postgres-volume is still attached to the Postgres service in your development environment, and volume names must be unique within a project. You would need to use a different name for the production volume. We also see that a replacement volume you created (postgres-data) is currently scheduled for permanent deletion on 2026-09-24 - if you want to keep it, you can cancel that deletion from the project's Activity feed by finding the deletion entry and clicking Restore before the deadline.