fix: return only listId from Amplitude list creation

[gagantrivedi]

• 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

Follow-up to #8399: verified against staging that Amplitude's production sync worker reads the list ID from the documented default key listId and ignores the configured response path. The compatibility body with the ID at four spellings/depths is no longer needed — the response is now just {"listId": ...}.

How did you test this code?

Unit tests updated; verified end to end against staging with a real Amplitude production sync (create followed by four parallel add batches).

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Aug 28, 2026 11:39am
flagsmith-frontend-preview	Ignored	Preview	Aug 28, 2026 11:39am
flagsmith-frontend-staging	Ignored	Preview	Aug 28, 2026 11:39am

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 078729cf-b00b-4559-b427-0ee6cda65453

📥 Commits

Reviewing files that changed from the base of the PR and between ab19267 and 770ca01.

📒 Files selected for processing (4)

• api/cohorts/sync_views.py
• api/tests/unit/cohorts/test_sync_views.py
• docs/docs/deployment-self-hosting/observability/_events-catalogue.md
• openapi.yaml

💤 Files with no reviewable changes (1)

• openapi.yaml

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📝 Walkthrough

Walkthrough

The Amplitude cohort sync create endpoint now returns only the camelCase listId field. The response schema and OpenAPI definition remove list_id and the nested response envelope. Cohort sync tests now read listId. The observability event catalogue points to the updated source line.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 770ca

The Amplitude list-creation response now returns only the documented list identifier, without changing authentication, tenant scoping, permissions, or resource creation; no actionable merge-blocking risk remains after normal checks and review.

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-8400	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-8400	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-8400	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-8400	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-8400	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-8400	Finished ✅	Results ✅

[github-actions]

✅ private-cloud · depot-ubuntu-latest-16 — run #19916 (attempt 1)

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

 2 passed

Details

 2 tests across 2 suites
 49.1 seconds
 06f4177
 🔄 Run: #19916 (attempt 1)

🗂️ Previous results

✅ private-cloud · depot-ubuntu-latest-arm-16 — run #19916 (attempt 1)

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

 2 passed

Details

 2 tests across 2 suites
 55.8 seconds
 06f4177
 🔄 Run: #19916 (attempt 1)

✅ oss · depot-ubuntu-latest-arm-16 — run #19917 (attempt 1)

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

 1 passed

Details

 1 test across 1 suite
 46.2 seconds
 770ca01
 🔄 Run: #19917 (attempt 1)

✅ oss · depot-ubuntu-latest-16 — run #19917 (attempt 1)

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

 1 passed

Details

 1 test across 1 suite
 41.1 seconds
 770ca01
 🔄 Run: #19917 (attempt 1)

✅ oss · depot-ubuntu-latest-arm-16 — run #19916 (attempt 1)

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

 2 passed

Details

 2 tests across 2 suites
 39.6 seconds
 06f4177
 🔄 Run: #19916 (attempt 1)

✅ oss · depot-ubuntu-latest-16 — run #19916 (attempt 1)

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

 1 passed

Details

 1 test across 1 suite
 32.5 seconds
 06f4177
 🔄 Run: #19916 (attempt 1)

[github-actions]

Visual Regression

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

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.81%. Comparing base (ab19267) to head (770ca01).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8400      +/-   ##
==========================================
- Coverage   98.81%   98.81%   -0.01%     
==========================================
  Files        1621     1621              
  Lines       66105    66102       -3     
==========================================
- Hits        65321    65318       -3     
  Misses        784      784              

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