Custom template deletion endpoint

[Linker44]

Ticket Ticket ENG-565

Description Of Changes

Added endpoint for deleting custom templates if they have a fides provided template to fall back to.
Added fallback logic.

Code Changes

• new delete custom template endpoint

Steps to Confirm

1. upload a custom integration
2. set up a connection using it.
3. use the delete custom template endpoint.
4. verify the config and dataset reverted back to the original template.

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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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
fides-plus-nightly	Ignored	Preview	Feb 6, 2026 10:04pm
fides-privacy-center	Ignored		Feb 6, 2026 10:04pm

[greptile-apps]

Greptile Overview

Greptile Summary

Added a new DELETE endpoint for removing custom connector templates with automatic fallback to Fides-provided templates. The endpoint validates that a custom template exists and has a default fallback before deletion, then updates all existing connection configs to use the Fides-provided template.

Key changes:

• New DELETE /connector-templates/{connector_template_type} endpoint with proper validation and authorization
• Service layer methods delete_datasets_for_connector_type() and update_existing_connection_configs_for_connector_type() to handle the migration
• Refactored monitored endpoints preservation logic to run earlier in the dataset upsert flow, fixing a bug where monitored collections weren't preserved when no customer dataset existed
• Comprehensive test coverage including integration tests

Issues found:

• Broad exception handler at connector_template_endpoints.py:300-307 catches HTTPExceptions from service methods and converts them to 500 errors
• Helper function _delete_custom_template() contains significant business logic that should be in the service layer per architectural guidelines
• Manual test cleanup code that's unnecessary since the database auto-clears between tests

Confidence Score: 4/5

• This PR is safe to merge with minor architectural improvements needed
• The implementation is functionally sound with good test coverage and proper validation. One critical issue exists with the broad exception handler that could mask errors. The code would benefit from better separation of concerns (moving business logic to service layer), but these are non-blocking improvements.
• connector_template_endpoints.py needs the exception handling fix at line 300

Important Files Changed

Filename	Overview
src/fides/api/api/v1/endpoints/connector_template_endpoints.py	Added delete endpoint for custom templates with validation and fallback logic to Fides-provided templates
src/fides/service/connection/connection_service.py	Added methods to delete datasets and update connection configs; moved monitored endpoints logic earlier in upsert flow
tests/ops/api/v1/endpoints/test_connector_template_endpoints.py	Added comprehensive test suite for delete custom connector template endpoint with integration test

[greptile-apps]

_{3 files reviewed, 3 comments}

_{Edit Code Review Agent Settings | Greptile}

[galvana]

This one looks good, just make the changes in the base branch and we should be good to go