docs: tag mutability adr

[jesperhodge]

Description

This is an ADR addressing an ambiguity on what identifiers of a Tag in a Taxonomy should be editable.

For further details, see the Files changed, as well as the conversations in this PR.

[openedx-webhooks]

Thanks for the pull request, @jesperhodge!

This repository is currently maintained by @axim-engineering.

Once you've gone through the following steps feel free to tag them in a comment and let them know that your changes are ready for engineering review.

🔘 Get product approval

If you haven't already, check this list to see if your contribution needs to go through the product review process.

• If it does, you'll need to submit a product proposal for your contribution, and have it reviewed by the Product Working Group.
  • This process (including the steps you'll need to take) is documented here.
• If it doesn't, simply proceed with the next step.

🔘 Provide context

To help your reviewers and other members of the community understand the purpose and larger context of your changes, feel free to add as much of the following information to the PR description as you can:

• Dependencies

  This PR must be merged before / after / at the same time as ...

• Blockers

  This PR is waiting for OEP-1234 to be accepted.

• Timeline information

  This PR must be merged by XX date because ...

• Partner information

  This is for a course on edx.org.

• Supporting documentation
• Relevant Open edX discussion forum threads

🔘 Get a green build

If one or more checks are failing, continue working on your changes until this is no longer the case and your build turns green.

Details

---

Where can I find more information?

If you'd like to get more details on all aspects of the review process for open source pull requests (OSPRs), check out the following resources:

• Overview of Review Process for Community Contributions
• Pull Request Status Guide
• Making changes to your pull request

When can I expect my changes to be merged?

Our goal is to get community contributions seen and reviewed as efficiently as possible.

However, the amount of time that it takes to review and merge a PR can vary significantly based on factors such as:

• The size and impact of the changes that it introduces
• The need for product review
• Maintenance status of the parent repository

💡 As a result it may take up to several weeks or months to complete a review and merge your PR.

[bradenmacdonald]

I think this is a good summary of our conversation.

As for how to handle external_id, I think a compromise might be:

• The taxonomy editor UI displays external IDs, but doesn't allow changing them. It may allow specifying them when creating a tag, and/or generate one based on the value if none is specified.
• In the rare case where an external ID needs to be changed, that can be easily done by an administrator using the Django admin UI.

[jesperhodge]

I think this is a good summary of our conversation.

As for how to handle external_id, I think a compromise might be:

• The taxonomy editor UI displays external IDs, but doesn't allow changing them. It may allow specifying them when creating a tag, and/or generate one based on the value if none is specified.
• In the rare case where an external ID needs to be changed, that can be easily done by an administrator using the Django admin UI.

Sounds good to me. Do you agree with this solution @mgwozdz-unicon ? In that case I'll put that in the ADR decision block and mark this as ready for review

[mgwozdz-unicon]

I think this is a good summary of our conversation.
As for how to handle external_id, I think a compromise might be:

• The taxonomy editor UI displays external IDs, but doesn't allow changing them. It may allow specifying them when creating a tag, and/or generate one based on the value if none is specified.
• In the rare case where an external ID needs to be changed, that can be easily done by an administrator using the Django admin UI.

Sounds good to me. Do you agree with this solution @mgwozdz-unicon ? In that case I'll put that in the ADR decision block and mark this as ready for review

Yes, I think this sounds good.

[jesperhodge]

@bradenmacdonald ready for review