- Add validateCreateJobRequest() checking required fields (companyId,
title ≥5 chars, description ≥20 chars) and enum values
(employmentType, workMode, status) before hitting the DB
- Catch *pq.Error in handler: check_violation (23514) and
foreign_key_violation (23503) now return 400; unique_violation (23505)
returns 409; other DB errors return 500 without leaking raw pq messages
- Fix test fixtures: description and companyId now meet validation
requirements
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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