ALTER TABLE scheduled_events
  DROP CONSTRAINT IF EXISTS chk_event_type,
  ADD CONSTRAINT chk_event_type CHECK (event_type IN ('call', 'follow_up', 'website_creation'));

ALTER TABLE scheduled_events
  ADD COLUMN IF NOT EXISTS client_name VARCHAR(255),
  ADD COLUMN IF NOT EXISTS client_email VARCHAR(255),
  ADD COLUMN IF NOT EXISTS client_phone VARCHAR(50);
