feat(__future__): Actionable error message for duplicate priorities in update-flag

[emyller]

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Changes

Closes #8301

Evolve conflicting segment override priority error message from, e.g.:

Duplicate priority: 1

To, e.g.:

The overrides for segments 33 (Test Segment) and 44 (Test Segment 2) are in conflict; provide explicit priority values.

How did you test this code?

Integration tests.

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Aug 14, 2026 10:22pm
flagsmith-frontend-preview	Ignored	Preview	Aug 14, 2026 10:22pm
flagsmith-frontend-staging	Ignored	Preview	Aug 14, 2026 10:22pm

[coderabbitai]

📝 Walkthrough

Walkthrough

Priority validation now groups ordered segment overrides by priority and detects conflicts. DuplicatePriorityError receives the conflicting segments and reports their IDs and names. The error also instructs callers to provide explicit priority values. Integration tests now verify the updated 400 responses for both conflict scenarios.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to c60cf

The change makes duplicate-priority errors identify the conflicting segments; validation may incur extra query materialization for unusually large feature configurations, but no actionable merge-blocking risk remains.

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-8303	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-8303	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-8303	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api-test:pr-8303	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-8303	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-8303	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-8303	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-8303	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-8303	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-8303	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-8303	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-8303	Finished ✅	Results ✅

[coderabbitai]

Actionable comments posted: 1

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 91e51c55-da0f-4422-b3b2-c51bb9f408f2

📥 Commits

Reviewing files that changed from the base of the PR and between a013d7b and c60cf82.

📒 Files selected for processing (3)

• api/features/future/exceptions.py
• api/features/future/services.py
• api/tests/integration/features/future/test_flag_endpoint.py

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.78%. Comparing base (a013d7b) to head (c60cf82).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8303   +/-   ##
=======================================
  Coverage   98.78%   98.78%           
=======================================
  Files        1604     1604           
  Lines       64335    64344    +9     
=======================================
+ Hits        63551    63560    +9     
  Misses        784      784           

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[github-actions]

✅ private-cloud · depot-ubuntu-latest-16 — run #19410 (attempt 1)

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

 1 passed

Details

 1 test across 1 suite
 54.8 seconds
 a9f3ce4
 🔄 Run: #19410 (attempt 1)

🗂️ Previous results

✅ private-cloud · depot-ubuntu-latest-arm-16 — run #19410 (attempt 1)

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

 3 passed

Details

 3 tests across 3 suites
 59 seconds
 a9f3ce4
 🔄 Run: #19410 (attempt 1)

✅ private-cloud · depot-ubuntu-latest-16 — run #19411 (attempt 1)

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

 2 passed

Details

 2 tests across 2 suites
 32.2 seconds
 c60cf82
 🔄 Run: #19411 (attempt 1)

✅ oss · depot-ubuntu-latest-arm-16 — run #19411 (attempt 1)

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

 1 passed

Details

 1 test across 1 suite
 40.1 seconds
 c60cf82
 🔄 Run: #19411 (attempt 1)

✅ private-cloud · depot-ubuntu-latest-arm-16 — run #19411 (attempt 1)

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

 23 passed
 1 skipped

Details

 24 tests across 18 suites
 1 minute, 25 seconds
 c60cf82
 🔄 Run: #19411 (attempt 1)

Skipped tests

firefox › tests/onboarding-tests.pw.ts › Onboarding › New user connects via the single-page onboarding flow @oss

✅ oss · depot-ubuntu-latest-arm-16 — run #19410 (attempt 1)

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

 1 passed

Details

 1 test across 1 suite
 44.8 seconds
 a9f3ce4
 🔄 Run: #19410 (attempt 1)

[github-actions]

✅ oss · depot-ubuntu-latest-16 — run #19411 (attempt 1)

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

 1 passed

Details

 1 test across 1 suite
 41.1 seconds
 c60cf82
 🔄 Run: #19411 (attempt 1)

[github-actions]

✅ oss · depot-ubuntu-latest-16 — run #19410 (attempt 1)

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

 1 passed

Details

 1 test across 1 suite
 36.8 seconds
 a9f3ce4
 🔄 Run: #19410 (attempt 1)

[github-actions]

Visual Regression

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