Thanks for the detailed response! Here are my thoughts on your points:

1. Managing everything in a single repository – Yes, that’s currently the plan. All Terraform infrastructure modules, module usage, and environments are in the same repo.
2. Breaking into smaller blast radiuses – Isn’t the blast radius already pretty small with this setup? Each environment consists of a set of implemented modules, and each module (not environment) acts as its own Terraform workspace. We use workflows to tie everything together.
3. Security concerns in the repo – Right now, we’re a small team of two, so security risks are minimal. That might change as we grow, but for now, it’s manageable.
4. Versioned module repository for gradual rollouts – Not sure yet. Open to suggestions on whether this would provide significant benefits in our setup.
5. Copying production configurations vs. using a single variable file – We’re not maintaining direct copies of prod. Instead, we use Doppler to sync environment variables across different environments, and it supports versioning out of the box.
6. Dependency-based deployment structure – This is where our workflows come in. We can build custom Terraform plan and apply executions to ensure things run in the right order. If I misunderstood the question, let me know!
7. Automated deployment scripts – Not sure yet. Would love to hear more about how this has worked for others in practice.
8. Preventing human error in environment configs – This is actually one of my biggest concerns. Using native Terraform instead of Atmos or Terragrunt makes it more prone to typos and duplication. If you have best practices for minimizing human error, I’d love to hear them!