ENG-1086: Updates legacy taxonomy consts for custom taxonomy API

[eastandwestwind]

Ticket ENG-1086

❗ Please test alongside the Fidesplus PR https://github.com/ethyca/fidesplus/pull/2677

Description Of Changes

Updates legacy taxonomy consts for custom taxonomy API work.

Our legacy taxonomies are auto-inserted into the DB on server start. these include:

# Seed legacy taxonomies that are managed by the system
    op.execute(
        """
        INSERT INTO taxonomy (id, created_at, updated_at, fides_key, organization_fides_key, tags, name, description)
        VALUES
          ('data_category', now(), now(), 'data_category', NULL, NULL, 'Data categories', 'Taxonomy for data categories'),
          ('data_use', now(), now(), 'data_use', NULL, NULL, 'Data uses', 'Taxonomy for data uses'),
          ('data_subject', now(), now(), 'data_subject', NULL, NULL, 'Data subjects', 'Taxonomy for data subjects'),
          ('system_group', now(), now(), 'system_group', NULL, NULL, 'System groups', 'Taxonomy for system groups')
        """
    )

We have to ensure any time we need to check / access legacy taxonomies, we use the fides_key instead of the resource type. I've also updated the const to include system_group.

Code Changes

• Updated consts to use fides_key instead of resource type for taxonomies
• Updated const to include "system_groups"

Steps to Confirm

1. Confirm tests pass
2. Test alongside fidesplus PR (https://github.com/ethyca/fidesplus/pull/2677)
3. Using Swagger (http://localhost:8080/docs#/Plus), hit the following endpoints and confirm you are able to perform all operations:

Taxonomy-level operations:

GET /taxonomies - List all custom taxonomies

POST /taxonomies - Create a new custom taxonomy

PUT /taxonomies/{taxonomy_type} - Update a taxonomy

DELETE /taxonomies/{taxonomy_type} - Delete a taxonomy

Taxonomy Element operations:

GET /taxonomies/{taxonomy_type}/elements - List elements for a taxonomy

POST /taxonomies/{taxonomy_type}/elements - Create a new element

PUT /taxonomies/{taxonomy_type}/elements/{fides_key} - Update an element

DELETE /taxonomies/{taxonomy_type}/elements/{fides_key} - Delete an element

Pre-Merge Checklist

• Issue requirements met
• All CI pipelines succeeded
• CHANGELOG.md updated
  • Add a db-migration This indicates that a change includes a database migration label to the entry if your change includes a DB migration
  • Add a high-risk This issue suggests changes that have a high-probability of breaking existing code label to the entry if your change includes a high-risk change (i.e. potential for performance impact or unexpected regression) that should be flagged
  • Updates unreleased work already in Changelog, no new entry necessary
• UX feedback:
  • All UX related changes have been reviewed by a designer
  • No UX review needed
• Followup issues:
  • Followup issues created
  • No followup issues
• Database migrations:
  • Ensure that your downrev is up to date with the latest revision on main
  • Ensure that your downgrade() migration is correct and works
    • If a downgrade migration is not possible for this change, please call this out in the PR description!
  • No migrations
• Documentation:
  • Documentation complete, PR opened in fidesdocs
  • Documentation issue created in fidesdocs
  • If there are any new client scopes created as part of the pull request, remember to update public-facing documentation that references our scope registry
  • No documentation updates required

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Project	Deployment	Preview	Comments	Updated (UTC)
fides-plus-nightly	Ready	Preview	Comment	Oct 29, 2025 11:35pm

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
fides-privacy-center	Ignored			Oct 29, 2025 11:35pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.40%. Comparing base (9968765) to head (f5173e9).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6824      +/-   ##
==========================================
- Coverage   87.40%   87.40%   -0.01%     
==========================================
  Files         520      520              
  Lines       33920    33918       -2     
  Branches     3899     3899              
==========================================
- Hits        29648    29646       -2     
  Misses       3415     3415              
  Partials      857      857              

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