fix: fix db env not work

[fatelei]

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Summary

fix #30536

fix db env not work

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 addresses a critical issue where database environment variables and configurations were not being correctly recognized or applied, leading to potential misconfigurations in the database connection. By explicitly triggering the SQLAlchemy engine's creation during the application's initialization phase, it ensures that all specified settings, particularly those related to connection pooling, are properly loaded and active from the outset. This change aims to stabilize database connectivity and prevent unexpected behavior stemming from unapplied configurations.

Highlights

• Database Environment Fix: Resolved an issue where database environment configurations, such as connection pool settings, were not being correctly applied during application startup.
• SQLAlchemy Engine Initialization: Implemented eager initialization of the SQLAlchemy engine within the application context to ensure that all configured options (e.g., pool_size, max_overflow) are properly loaded and utilized.
• Error Handling: Added robust error handling around the engine initialization process to log any failures during database setup.

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[gemini-code-assist]

Code Review

This pull request aims to fix an issue where database environment variables were not being applied correctly by eagerly initializing the SQLAlchemy engine during application startup. The approach is logical and directly addresses the problem. My review includes one high-severity comment regarding the exception handling. Using a broad except Exception can mask critical startup failures, and I recommend using more specific exceptions to ensure the application fails fast or provides clearer error logs when the database cannot be initialized.