It's worth checking out "terragrunt" it helps one breakdown larger terraform sites into re-usable modules which can be ran independently without having to rede

It's worth checking out "terragrunt" it helps one breakdown larger terraform sites into re-usable modules which can be ran independently without having to redefine common configuration such as backends. It allows for running a plan or apply on the whole site, or each individual module in the site. So in this case it's easy to just apply the database changes, and then run the whole site plan to make sure everything is indeed in the right state.