fix(glossary): deduplicate Unicode source case variants

[rudycelekli]

Summary

SQLite LOWER folds only ASCII, so auto-extraction can duplicate an existing manual glossary term with accented or Cyrillic casing.

Changes

• Read saved sources directly and apply the same Python Unicode casing to saved and proposed terms.
• Add focused regressions and update the relevant documentation and changelog.

Type

• 🐛 Bug fix

Testing

• Hosted CI audit at 2026-10-06T12:35:20.584679+00:00: no failing latest checks; required CLA passes. All latest reported checks completed successfully. No upstream merge performed.

• Real Pydantic models, endpoint parsing and SQLite writes are exercised; only the completion boundary is scripted. Accented, Cyrillic, ASCII and separate-project controls pass. No model-quality claim is made.

• Regression against unchanged main production source: 3 failed, 5 passed. After the fix: 8 passed; 21 with changelog gate.

• Python 3.13 with HF_HUB_OFFLINE=1 and an empty Hugging Face cache. No model download or inference calls.

• Diff check and Python compilation pass.

• Full backend/Electron suites were not run locally; focused tests alone do not establish hosted security or platform gates. Hosted results are reported separately below.

Review follow-up verification

• Symmetric Unicode case folding covers saved sources, proposed-source checks and newly inserted keys. Six added native SQLite regressions fail before this follow-up; 27 focused glossary/changelog tests pass afterward. German sharp S and Greek sigma are covered in both existing-term and same-batch deduplication while stored source spelling, manual translations and project scope remain intact.

Checklist

• I've tested this locally
• Every commit author has signed the CLA — registered signature and required CLA status verified
• I've updated relevant documentation
• No local machine paths, logs, or personal env details in this PR
• Maintained version files are in sync — no version bump
• Runtime regression fixture still loads green on smoke-matrix CI — not run locally

Closes #2638

[github-actions]

All contributors on this pull request have signed the VoiceStudio CLA. Thank you!

[greptile-apps]

[Medium risk] Changes how glossary terms are deduplicated during auto-extraction.

The PR appears safe to merge based on this review; no new actionable issue was identified.

Summary

The PR uses Unicode case folding to deduplicate glossary auto-extraction proposals against saved terms and proposals in the same batch.

• Adds SQLite-backed regressions for accented, Cyrillic, German sharp-S, and Greek sigma variants.
• Updates the glossary documentation and changelog.

_{Reviews (2) · Last reviewed commit: "fix(glossary): fold Unicode source keys ..."}

[coderabbitai]

📝 Walkthrough

Walkthrough

Glossary auto-extraction now deduplicates existing and proposed terms using Python lowercase conversion. The added test covers ASCII, accented Latin, and Cyrillic case variants, and verifies that deduplication applies only within the current project.

Changes

Glossary deduplication

Layer / File(s)	Summary
Project term deduplication backend/api/routers/glossary.py, tests/test_glossary_scrub.py, docs/dubbing/translation-engines.md, CHANGELOG.md	The route lowercases original saved source terms in Python before deduplication. The regression test checks Unicode and ASCII variants, preserves the existing manual term, and verifies project scope. The documentation and changelog describe the behavior.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Low

Suggested reviewers: debpalash

Merge Risk: 🔵 Low · up to 82ded

Some Unicode-equivalent glossary terms can still be duplicated. This is a bounded issue to fix or explicitly accept before merging.

🚥 Pre-merge checks | ✅ 9

✅ Passed checks (9 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Issue [#2638] requires deduplication of Unicode case variants in glossary auto-extraction. backend/api/routers/glossary.py now compares saved and proposed sources with Python lower(), and `tests/t…
Out of Scope Changes check	✅ Passed	The glossary regression tests, documentation note, and changelog entry support the fix for [#2638]. The reviewed changes contain no demonstrated unrelated change.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (2 skipped: 2 …
Cross-Platform Default Parity	✅ Passed	The default auto-extract path now uses Python str.lower() on saved and proposed terms, with no operating-system-specific branch. The app uses managed Python 3.11 across macOS, Windows, and Linux, so…
I18n Completeness (21 Locales)	✅ Passed	The PR changes only CHANGELOG.md, backend/api/routers/glossary.py, docs/dubbing/translation-engines.md, and tests/test_glossary_scrub.py. It adds no Electron UI t('...') keys and no hardcode…
Local-First Guarantee	✅ Passed	The PR adds no required cloud call, account, API key, or outbound call. Its only production-code change reads glossary sources from SQLite and applies Python Unicode lowercasing; the existing LLM call…
Backward Compatibility	✅ Passed	The PR changes glossary deduplication logic only. Its database query reads existing glossary_terms.source values and applies Python lowercase conversion; it adds, removes, or alters no database colu…
Title check	✅ Passed	The title follows the required conventional-commit format with a scope, and the description references issue #2638.
Description check	✅ Passed	The description includes the required summary, changes, type, testing, and checklist sections. It notes that the runtime regression fixture was not run locally.

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[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
Review comments at @backend/api/routers/glossary.py:
- Line 278: Update the source-key normalization in the deduplication logic
around existing_srcs to use casefold() for both saved and proposed sources, and
add a regression test confirming that Straße and STRASSE are treated as
duplicates.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Repository: debpalash/VoiceStudio/.coderabbit.yaml
• Review profile: CHILL
• Plan: Advanced
• Run ID: 72c7b708-d15c-438f-989e-31bc66e30cda

📥 Commits

Reviewing files that changed from the base of the PR and between 286f46b and 82ded33.

📒 Files selected for processing (4)

• CHANGELOG.md
• backend/api/routers/glossary.py
• docs/dubbing/translation-engines.md
• tests/test_glossary_scrub.py

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