chore: rename the migration file

[hjlarry]

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Summary

fix #30891

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @hjlarry, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the clarity and maintainability of the project's database migration system by renaming a migration file. The new name accurately reflects the migration's intended purpose, making it easier for developers to understand its function and impact on the database schema.

Highlights

• Migration File Renaming: The pull request renames the migration file api/migrations/versions/2026_01_09_1630-905527cc8fd3_.py to api/migrations/versions/2026_01_09_1630-905527cc8fd3_add_workflow_run_created_at_id_idx.py. This change provides a more descriptive and informative name for the migration.
• Issue Fix: This change directly addresses and fixes the issue described in [Refactor/Chore] migration file missing file name #30891.

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[gemini-code-assist]

Code Review

This pull request renames a database migration file to improve clarity and consistency. The new filename, ..._add_workflow_run_created_at_id_idx.py, accurately describes the migration's purpose, which is to add an index to the workflow_runs table. This change aligns with the project's naming convention for migration files and enhances maintainability. Since this is purely a file rename with no code modifications, there are no specific code review comments. The change is beneficial and looks good to merge.