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How do I specify reserved instances with Gruntwork modules?

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I need to have my databases run on reserved instances. How can I indicate this with Gruntwork modules? --- <ins datetime="2022-11-30T17:14:11Z"> <p><a href="https://support.gruntwork.io/hc/requests/109675">Tracked in ticket #109675</a></p> </ins>

Reserved instances are a billing mechanism that AWS uses to determine how much to charge you for your database instances. To quote the [AWS RDS Reserved Instances marketing page](https://aws.amazon.com/rds/reserved-instances/): > If you purchase a Reserved Instance in a given region where you have a applicable running DB instance, the benefit will automatically be applied to that instance moving forward. Therefore, there's nothing to indicate with the Gruntwork modules!