feat: add flask command file-usage

[fatelei]

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Summary

fix #30477

add flask command file-usage

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 dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @fatelei, 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 significantly enhances the database management toolkit by adding a new Flask command, file-usage. This command provides a robust mechanism for tracking how files are referenced across different database entities. By offering detailed filtering, pagination, and flexible output options, it empowers developers and administrators to gain deeper insights into file dependencies, which is crucial for maintaining data integrity and performing cleanup operations. This addition streamlines the process of identifying where specific files are utilized throughout the system.

Highlights

• New Flask Command: Introduced a new Flask click command named file-usage to query and display where files are referenced within the database.
• Query Capabilities: The file-usage command supports filtering by file UUID (--file-id), storage key (--key), and source table/column patterns (--src). It also includes pagination options (--limit, --offset).
• Output Formats: Results can be output in a human-readable table format or as JSON, providing flexibility for different use cases.
• Database Reference Tracing: The command reuses existing logic for checking file references across various database tables and columns, including direct UUID matches and UUIDs embedded in text or JSON fields.

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[gemini-code-assist]

Code Review

This pull request introduces a new file-usage command that allows users to query and display where files are referenced across various database tables, supporting filtering by file ID, storage key, and source table/column patterns, along with pagination and JSON output. The command reuses existing logic for identifying file references. Review comments highlight two main areas for improvement: the current pagination implementation collects all file usages into memory before applying limits, which could lead to high memory consumption for large datasets and should be refactored to use a generator for better memory efficiency; additionally, the src filter's wildcard matching performs inefficient database queries for each table, and it's suggested to perform this filtering in-memory using Python's fnmatch module to reduce database round-trips.