Fix case insensitive connector type matching

[Linker44]

Ticket ENG-2706

Description Of Changes

Upon the upload of a new custom template we try to update existing connections by searching for connection configs with the same connector type.
If the connector type is uppercase it will stay uppercased for the connection config but the connector_type value being compared against will be casted to lowercase. this causes a type mismatch and zero connectors being found so no update is done.

We should cast the connection config connector type to lowercase since that is what we do for connector_type.

Code Changes

Steps to Confirm

1. Upload a custom template with an uppercase connector_type.
2. set up an integration with it.
3. upload the same custom template with the same connector type but with an updated saas config. validate that the update was sucessfull for the connection config.

Pre-Merge Checklist

• Issue requirements met
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• CHANGELOG.md updated
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  • Updates unreleased work already in Changelog, no new entry necessary
• UX feedback:
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• Documentation:
  • Documentation complete, PR opened in fidesdocs
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Project	Deployment	Actions	Updated (UTC)
fides-plus-nightly	Ready	Preview, Comment	Feb 18, 2026 7:45pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
fides-privacy-center	Ignored		Feb 18, 2026 7:45pm

[greptile-apps]

Greptile Overview

Greptile Summary

Fixed a bug where connector type matching failed when the stored type field in saas_config had different casing than the connector template. The fix adds case-insensitive comparison using sa_func.lower() on both sides of the filter condition, ensuring that connector configs are properly updated regardless of case differences.

• Changed the database filter to use sa_func.lower() for case-insensitive comparison
• Added import for sqlalchemy func as sa_func
• Added logging to track how many connection configs were found for the connector type
• Changed return type annotation from Iterable[ConnectionConfig] to list[ConnectionConfig] for clarity
• Added comprehensive test case that validates uppercase stored types match lowercase template types
• Test includes manual cleanup that should be removed per project guidelines

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The change is straightforward, well-tested, and addresses a specific bug. The case-insensitive comparison is the correct approach for this issue. The only concern is a minor style violation with manual test cleanup that doesn't affect production code.
• No files require special attention

Important Files Changed

Filename	Overview
src/fides/service/connection/connection_service.py	Added case-insensitive matching for connector types using sa_func.lower() and added helpful logging
tests/service/test_connection_service.py	Comprehensive test for case-insensitive connector type matching; includes unnecessary manual cleanup

_{Last reviewed commit: 8f035bc}

[greptile-apps]

_{2 files reviewed, 1 comment}

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