[bconnell]

Problem

The API treated every DataIntegrityViolationException as a duplicate lead email and returned HTTP 409, even when the database failure involved another constraint.

Fix

• Match the named uk_leads_email constraint, including the H2 backing-index form, before returning the existing email-conflict response.
• Return a generic, safe 500 Problem Detail for other or unrecognized integrity violations.
• Add HTTP regression coverage for real check-constraint failures against H2 and PostgreSQL.
• Record the exact validation evidence and limits in the portfolio completeness report.

Validation completed on the final PR head

• CI run 39081485357 completed successfully on 86583c6b14b6a5246935be57448e620aee3e6a55.
• 40 application tests and 4 PostgreSQL Testcontainers integration tests passed. Zero failures, errors, or skips.
• Spring Boot packaging, Docker Compose PostgreSQL readiness, and cleanup all passed.
• Java 21 independent check of the constraint-name matcher accepted four expected formats and rejected five unrelated names.
• Diff limited to the handler, its H2 and PostgreSQL HTTP tests, and the portfolio completeness report.
• No production deployment, authentication, or performance promises are made.

Review and release

This change closes the integrity-failure classification defect identified in the portfolio completeness report. Merge only the validated head; future changes need fresh validation.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-18T00:08:25.373520Z	86583c6	Draft marked ready

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