-- +goose Up
-- Allow pending unsubscribe tokens (issued at send time) before the recipient opts out.
ALTER TABLE email_unsubscribes ALTER COLUMN unsubscribed_at DROP NOT NULL;
ALTER TABLE email_unsubscribes ALTER COLUMN unsubscribed_at DROP DEFAULT;

-- +goose Down
UPDATE email_unsubscribes SET unsubscribed_at = COALESCE(unsubscribed_at, now()) WHERE unsubscribed_at IS NULL;
ALTER TABLE email_unsubscribes ALTER COLUMN unsubscribed_at SET DEFAULT now();
ALTER TABLE email_unsubscribes ALTER COLUMN unsubscribed_at SET NOT NULL;