-- Migration for Story 3.1: URL Generation and Site Assignment
-- Run this on your development database to test the changes
-- The model updates will handle production automatically

-- Make custom_hostname nullable
ALTER TABLE site_deployments 
  MODIFY COLUMN custom_hostname VARCHAR(255) NULL;

-- Add unique constraint to pull_zone_bcdn_hostname
ALTER TABLE site_deployments 
  ADD CONSTRAINT uq_pull_zone_bcdn_hostname 
  UNIQUE (pull_zone_bcdn_hostname);