CREATE EXTENSION IF NOT EXISTS "pgcrypto";

UPDATE "users"
SET "id" = gen_random_uuid()::text
WHERE "id" !~* '^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$';

UPDATE "lms_notifications"
SET "id" = gen_random_uuid()::text
WHERE "id" !~* '^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$';

ALTER TABLE "users"
  ALTER COLUMN "id" TYPE uuid USING "id"::uuid;

ALTER TABLE "lms_notifications"
  ALTER COLUMN "id" TYPE uuid USING "id"::uuid;