chore: Simplify to_dict, from_dict with default (de-)serialization of Secrets

[julian-risch]

Related Issues

• fixes Simplify to_dict, from_dict with default (de-)serialization of Secrets #10406

Proposed Changes:

• Drop to_dict and deserialize_secrets_inplace where Secrets are handled in (de-)serialization
• Remove imports that are no longer used
• Correct a few docstrings where to_dict and from_dict docstrings were mixed up

How did you test it?

• unit tests

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct.
• I have updated the related issue with new insights and changes.
• I have added unit tests and updated the docstrings.
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
• I have documented my code.
• I have added a release note file, following the contributors guidelines.
• I have run pre-commit hooks and fixed any issue.

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Project	Deployment	Review	Updated (UTC)
haystack-docs	Ready	Preview, Comment	Jan 20, 2026 5:17pm

[davidsbatista]

LGTM!

[davidsbatista]

@julian-risch looks good - I think we can also open an issue to do the same in the integrations.

[julian-risch]

@julian-risch looks good - I think we can also open an issue to do the same in the integrations.

Yes, I can do that. Will be blocked by the Haystack release for now but not for long. 🙂