Fix/db connection pool limit

[Prajna1999]

Summary

Target issue is #PLEASE_TYPE_ISSUE_NUMBER
Explain the motivation for making this change. What existing problem does the pull request solve?

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

Notes

Please add here if any other information is required for the reviewer.

Summary by CodeRabbit

• Chores
  • Enhanced background task monitoring with improved logging of system resource metrics at task startup.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3235ab5b-2e64-43f5-bbb5-7a8480aa760c

📥 Commits

Reviewing files that changed from the base of the PR and between 9b3a5ee and 945f39f.

📒 Files selected for processing (1)

• backend/app/celery/celery_app.py

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📝 Walkthrough

Walkthrough

The pull request adds a Celery task_prerun signal handler to log SQLAlchemy database connection pool metrics (checked_out, size, overflow) at the start of each task execution. This enhancement provides visibility into pool utilization without altering existing task initialization behavior.

Changes

Cohort / File(s)	Summary
Database Pool Monitoring backend/app/celery/celery_app.py	Added log_pool_status() signal handler for Celery task_prerun events that logs QueuePool metrics from the SQLAlchemy engine instance at task startup.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• Fix/db connection pool limit #738: Modifies SQLAlchemy engine pool configuration (pool_size/max_overflow), which directly relates to the pool metrics now being logged by this PR's monitoring hook.

Suggested reviewers

• vprashrex

Poem

🐰 Hop hop, a task begins to run,
Pool metrics logged, observability won!
Checked_out and size, the dance so bright,
SQLAlchemy's secrets now in sight! ✨

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/db-connection-pool-limit

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[codecov]

Codecov Report

❌ Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/app/celery/celery_app.py	37.50%	5 Missing ⚠️

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