fix: make LOG_DIR creation race-safe with exist_ok=True

[pranav-afk]

Description

Makes log directory creation race-safe during concurrent local Docker Compose startups.

On a clean boot, multiple backend containers (API, migrator, worker, beat) can all try to create plane/logs at the same time. The old pattern:

if not os.path.exists(LOG_DIR):
os.makedirs(LOG_DIR)

is not atomic, so one process can create the directory between another’s existence check and makedirs, causing:

FileExistsError: [Errno 17] File exists: '/code/plane/logs'

That can crash containers and leave the UI stuck loading—especially on multi-core hosts or Windows/WSL2 where the race window is wider.

Change: use a single race-safe call in both local and production settings:

os.makedirs(LOG_DIR, exist_ok=True)

Type of Change
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] Feature (non-breaking change which adds functionality)
• [ ] Improvement (change that would cause existing functionality to not work as expected)
• [ ] Code refactoring
• [ ] Performance improvements
• [ ] Documentation update

Screenshots and Media (if applicable)
N/A — backend settings only.

Test Scenarios
• Remove or clear the local apps/api/plane/logs directory (or start from a clean volume)
• Run docker compose -f docker-compose-local.yml up --build so api/migrator/worker start together
• Confirm containers start without FileExistsError in migrator/api logs
• Confirm the logs directory is created and services continue past settings import
• Re-run with an existing logs directory and confirm startup still succeeds (no-op path)

References
• Fixes #9352

Summary by CodeRabbit

• Bug Fixes
  • Improved reliability when creating the application’s logging directory.
  • Prevented potential errors caused by concurrent or repeated directory creation in local and production environments.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 64c0abb2-bdba-4d47-84b4-ff6c02bbd8a7

📥 Commits

Reviewing files that changed from the base of the PR and between dc9d80b and 9a3fa30.

📒 Files selected for processing (2)

• apps/api/plane/settings/local.py
• apps/api/plane/settings/production.py

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📝 Walkthrough

Walkthrough

The local and production settings now create LOG_DIR with os.makedirs(..., exist_ok=True), removing the check-then-create race condition while preserving the existing log directory path.

Changes

Log directory initialization

Layer / File(s)	Summary
Update log directory initialization apps/api/plane/settings/local.py, apps/api/plane/settings/production.py	Both environments use idempotent directory creation for LOG_DIR instead of checking for existence first.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: dheeru0198, pablohashescobar

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: making LOG_DIR creation race-safe with exist_ok=True.
Description check	✅ Passed	The description matches the template and includes the change summary, type, test scenarios, and references.
Linked Issues check	✅ Passed	The PR addresses #9352 by removing the race in log directory creation, which resolves the reported FileExistsError.
Out of Scope Changes check	✅ Passed	The production.py update is still directly related to the same LOG_DIR race fix and is not unrelated scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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