PR Type: Refactoring

PR Summary: The pull request introduces a refactoring of the fragment update functionality within the repository and updater classes. It defines a new UpdatableField type and refactors the update methods to use this type, improving type safety and clarity. The PR also separates the transliteration update logic into its own method, further clarifying the codebase.

Decision: Comment

General suggestions:

• Ensure that the new update_transliteration method and the changes to update_field method are thoroughly tested, especially around the behavior when setting a field to None. This could potentially unset values in the database if not handled correctly.
• Review the broader impact of changing the update_lemmatization method to use the 'text' field instead of 'lemmatization'. Confirm that this aligns with the intended database schema and that it won't lead to incorrect updates.
• Consider the implications of the refactoring on existing code that may rely on the previous method signatures and ensure that all dependent code has been updated accordingly.

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