aws-cdk-rds-with-rotation.ts

    const database = new rds.DatabaseInstance(this, 'example', {
      engine: rds.DatabaseInstanceEngine.postgres({ version: rds.PostgresEngineVersion.VER_11 }),
      vpc: ec2.Vpc.fromLookup(this, 'vpc', { isDefault: true }),
      credentials: rds.Credentials.fromGeneratedSecret('admin'),
      // other RDS instance properties
    });

    database.addRotationSingleUser({
      automaticallyAfter: cdk.Duration.days(8 * 7),
      excludeCharacters: '!@#$%^&*'
    });