feat: added tests for n plus 1 queries in metrics view

[Zaimwa9]

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• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

• Added tests over N+1 queries in relation to experiment metrics service

How did you test this code?

• test

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		Jun 8, 2026 11:54am
flagsmith-frontend-preview	Ignored		Jun 8, 2026 11:54am
flagsmith-frontend-staging	Ignored		Jun 8, 2026 11:54am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-7728	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-7728	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-7728	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-7728	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-7728	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7728	Finished ✅	Results ✅

[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 40.6 seconds
 0383ad7
 🔄 Run: #17332 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 42.8 seconds
 0383ad7
 🔄 Run: #17332 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 2 passed

Details

 2 tests across 2 suites
 32.4 seconds
 0383ad7
 🔄 Run: #17332 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 2 passed

Details

 2 tests across 2 suites
 43.2 seconds
 0383ad7
 🔄 Run: #17332 (attempt 1)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.54%. Comparing base (19ffc62) to head (0383ad7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7728   +/-   ##
=======================================
  Coverage   98.54%   98.54%           
=======================================
  Files        1452     1452           
  Lines       55793    55808   +15     
=======================================
+ Hits        54983    54998   +15     
  Misses        810      810           

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[github-actions]

Visual Regression

19 screenshots compared. See report for details.
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[Zaimwa9]

@gemini-code-assist review

[gemini-code-assist]

Code Review

This pull request adds a new unit test, test_list_metrics__multiple_attachments__no_n_plus_one, to api/tests/unit/experimentation/test_metric_views.py to verify that listing metrics with multiple attachments does not trigger N+1 database queries. There are no review comments, so I have no feedback to provide.