v1.2.6

ArbeitszeitCheck 1.2.6

Highlights

• Hardens critical absence and vacation workflows for consistency under concurrent requests.
• Adds forensic approver identity persistence (approved_by_user_id) for approvals, rejections, and auto-approvals.
• Enforces entitlement snapshot uniqueness with deterministic upsert behavior on (user_id, period_key, as_of_date).

Included hardening work

• Added migration-backed unique key and dedup preparation for entitlement snapshots.
• Added robust conflict handling for concurrent upserts in entitlement snapshots and vacation year balances.
• Added user-scoped mutation locks and transactional lock/recheck paths for absence mutations.
• Normalized substitute status transitions and stricter date parsing in absence flows.
• Updated workflow-related unit and integration tests for the hardened logic.