fix: OPTIC-1438: Locking summary for update before reset

[mcanu]

PR fulfills these requirements

• Commit message(s) and PR title follows the format [fix|feat|ci|chore|doc]: TICKET-ID: Short description of change made ex. fix: DEV-XXXX: Removed inconsistent code usage causing intermittent errors
• Tests for the changes have been added/updated (for bug fixes/features)
• Docs have been added/updated (for bug fixes/features)
• Best efforts were made to ensure docs/code are concise and coherent (checked for spelling/grammatical errors, commented out code, debug logs etc.)
• Self-reviewed and ran all changes on a local instance (for bug fixes/features)

Change has impacts in these area(s)

(check all that apply)

• Product design
• Backend (Database)
• Backend (API)
• Frontend

Describe the reason for change

I've identified a potential race condition on data reimport.

1. Background worker is processing the imported data and creating tasks in a transaction
2. At the same time the API container receives a request to validate the project labeling configuration
3. The validate_config method of the project checks the number of tasks==0, so proceeds to reset the summary
4. The background worker updates the summary all_data_columns with the correct columns
5. The API process resets the summary

This PR adds a select_for_update on the summary before the creation of tasks and before checking the number of tasks on a potential reset. This should lock one of them out, not allowing the scenario described above.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: label_studio/data_import/functions.py

Function	Unhandled Issue
async_import_background	KeyError: 'predictions' data_import.functions.asy... Event Count: 42
async_reimport_background	[**ValidationError: ["Failed to parse input file 028a36e7-export_126647_project-126647-at-2025-02-13-20-14-6a27ccba.csv: ErrorDetail(string='Your label config has more than one data key and direct file upload supports only one data key. To import data with multiple data k...** ... Event Count: 2
async_import_background	ValidationError: ["HTTPConnectionPool(host='127.0.0.1', port=5050): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f6376ff2f30>: Failed to establish a new connection: [Errno 111] Connection refused'))"] ... Event Count: 1
async_import_background	ValidationError: ["Failed to parse input file ab4fd004-labelstudio_test.json: Unexpected character in found when decoding object value"] ... Event Count: 1

---

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[codecov]

Codecov Report

Attention: Patch coverage is 51.06383% with 23 lines in your changes missing coverage. Please review.

Project coverage is 77.10%. Comparing base (7666677) to head (db9411b).
Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
label_studio/data_import/functions.py	4.54%	21 Missing ⚠️
label_studio/projects/models.py	92.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7127      +/-   ##
===========================================
- Coverage    77.11%   77.10%   -0.01%     
===========================================
  Files          183      183              
  Lines        14414    14421       +7     
===========================================
+ Hits         11116    11120       +4     
- Misses        3298     3301       +3     

Flag	Coverage Δ
pytests	77.10% <51.06%> (-0.01%)	⬇️

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[mcanu]

/fm sync

Workflow run

[mcanu]

/git merge develop

Workflow run
Successfully merged: create mode 100644 web/libs/core/src/types/user.ts

[bmartel]

Looks good to me, I'd be curious as to how this influences performance with regards to importing tasks. Overall it cannot be escaped that this must adhere to a certain logical guarantee, otherwise there are potential race conditions which could occur.

[mcanu]

@bmartel completely agree, I'll monitor performance around this to see the impact this has.

[mcanu]

/git merge develop

Workflow run
Successfully merged: 16 files changed, 121 insertions(+), 32 deletions(-)

[mcanu]

/git merge develop

Workflow run
Successfully merged: 9 files changed, 27 insertions(+), 16 deletions(-)