fix(cv): make profile saves atomic

docs/work-programmes/master-progress.md

@@ -63,6 +63,7 @@ Updated: 2026-08-29
 - The previous Dashboard rendered its time-in-stage empty state using the unrelated “No tags yet” copy. Empty analytical panels are now suppressed instead of presenting mismatched messages.
 - The Application Analysis match previously ignored both `JobApplication.DescriptionLanguage`/`TranslatedDescription` and the linked CV's language setting. This could under-score an English CV against a Norwegian advert even when import had already stored a usable English translation.
 - The bundled portable Node runtime starts Next 16 successfully, but Turbopack repeatedly panicked while emitting `/page`; the webpack development path serves the same route correctly and is now the documented/scripted default.
+- Playwright exposed duplicate React keys in the long Code-template CV despite passing its assertions. Read-only inspection of the disposable SQLite database proved every relational Career Profile child had been inserted twice: a newly visible profile could be read and legacy-backfilled before its child replacement completed. Profile snapshot/children/history saves are now atomic, malformed duplicate item/order keys are normalized, and race-affected stored rows resolve once on reads without destructive cleanup.
 
 ### Verification
 
@@ -92,6 +93,7 @@ Updated: 2026-08-29
 - Job creation and Gmail workflow localization verification: 4 focused suites, 11/11 passed; TypeScript passed. The add-job stepper, Gmail continuity management, review queue, usage progress labels, errors and status copy now switch between English and Bokmål without translating user/job/email content.
 - Shared active-surface localization/accessibility verification: Profile 13/13 and settings/auth/landing 18/18 passed; TypeScript passed. Tag entry, Pro notices, disabled registration, profile load recovery, dashboard totals, language selector semantics, job-selection checkboxes and locale-aware correspondence dates were aligned with the global EN/NB system.
 - Final localization regression gate: all 62 frontend suites and 267/267 tests passed after correcting the isolated Pro-notice provider fallback; the optimized Next production build and integrated TypeScript check passed; the full .NET 9 backend suite passed 713/713.
+- Career Profile atomicity/CV locale verification: focused backend 55/55 and frontend 10/10 passed; the targeted long Code-template Playwright/PDF flow passed 1/1 with no duplicate-key or out-of-range locale warning. Its fresh disposable database contained exactly 9 experiences, 1 education, 8 skills, 1 project, 1 certification and 2 languages, with zero duplicate experience ItemKeys.
 - Backend matcher/intelligence focused verification: 35/35 passed, including detection of a manually created Norwegian advert with no saved translation.
 - Full backend: 712/712 tests passed on .NET 9.
 - Next optimized production build and TypeScript: passed after the Job Workspace/checklist batch.