fix(salary): stop RLS from failing vab/parental absence registration (#1568)

Migration 20260517135000 rewrote the franvaro-specifikationsnummer trigger
functions to insert audit rows into salary_absence_franvaro_audit, a table
with RLS enabled and zero policies, while leaving the functions SECURITY
INVOKER (its comment claimed implicit SECURITY DEFINER, which is false in
Postgres). Every vab/parental insert from role authenticated (dashboard
absence POST, web /pending approval, in-app Assistenten chat) then failed
with 42501, surfaced as a generic 500, and left no diagnosable trace.

- New migration 20260813120000: ALTER both trigger functions to SECURITY
  DEFINER with search_path pinned to public, pg_temp. No RLS policy is added
  on the audit table: trigger/service-only writes stay the design intent.
- mapInsertError: 42501 now maps to the new bilingual DB_PERMISSION_DENIED
  code instead of INTERNAL_ERROR, and 23514 is split so only the 24h-cap
  trigger's 'Total tid' message becomes ABSENCE_HOURS_CONFLICT; other CHECK
  violations map to VALIDATION_ERROR.
- commitRegisterAbsence/commitDeleteAbsence: log the underlying PG details
  and persist the sanitized structured code in result_data.error_code so the
  next failure is traceable from the op row.
- Dashboard absence route: only ABSENCE_HOURS_CONFLICT passes details.message
  through to the client; every other code shows the registry Swedish message
  instead of raw Postgres text.
- New pg-real regression test locks the authenticated-role parental/vab
  insert path, the shared per-month specnummer sequence, the audit rows, and
  idempotent upsert retries.

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

lib/pending-operations/__tests__/payroll-executors.test.ts

@@ -184,6 +184,49 @@ describe('commitPendingOperation: register_absence', () => {
     expect(result.status).toBe('rejected')
     expect(result.http_status).toBe(409)
   })
+
+  it('logs the PG details and persists a sanitized error_code when the upsert fails', async () => {
+    const consoleError = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const { supabase, enqueue, findCalls } = createQueuedMockSupabase()
+      enqueue({ data: { id: 'op-1' }, error: null }) // CAS claim
+      enqueue({ data: { id: 'emp-1' } }) // assertEmployee
+      enqueue({
+        data: null,
+        error: {
+          code: '42501',
+          message:
+            'new row violates row-level security policy for table "salary_absence_franvaro_audit"',
+        },
+      }) // upsert denied (the franvaro audit-trigger bug)
+      enqueue({ data: null, error: null }) // finalize (failed)
+
+      const op = makePendingOp({
+        operation_type: 'register_absence',
+        params: { employee_id: 'emp-1', from: '2026-03-02', to: '2026-03-02', absence_type: 'parental' },
+      })
+      const result = await commitPendingOperation(supabase as never, 'user-1', 'company-1', op)
+
+      expect(result.status).toBe('failed')
+      expect(result.http_status).toBe(500)
+      expect(result.code).toBe('DB_PERMISSION_DENIED')
+      // The op row keeps the structured code so the failure mode is
+      // diagnosable later, but never the raw PG text.
+      const updates = findCalls('pending_operations', 'update')
+      const finalize = updates[updates.length - 1]![0] as { result_data?: Record<string, unknown> }
+      expect(finalize.result_data).toMatchObject({
+        error_code: 'DB_PERMISSION_DENIED',
+        http_status: 500,
+      })
+      expect(JSON.stringify(finalize.result_data)).not.toContain('row-level security')
+      // The raw PG message goes to the log: it is persisted nowhere else.
+      const logged = consoleError.mock.calls.map((c) => c.join(' ')).join('\n')
+      expect(logged).toContain('register_absence commit failed')
+      expect(logged).toContain('row-level security')
+    } finally {
+      consoleError.mockRestore()
+    }
+  })
 })
 
 describe('commitPendingOperation: book_salary_run', () => {
@@ -279,6 +322,34 @@ describe('commitPendingOperation: delete_absence', () => {
     expect(result.status).not.toBe('committed')
     expect(result.error).toBeDefined()
   })
+
+  it('logs the PG details and persists a sanitized error_code when the delete fails', async () => {
+    const consoleError = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const { supabase, enqueue, findCalls } = createQueuedMockSupabase()
+      enqueue({ data: { id: 'op-1' }, error: null }) // CAS claim
+      enqueue({ data: { id: 'emp-1' } }) // assertEmployee
+      enqueue({ data: null, error: { code: '57014', message: 'canceling statement due to statement timeout' } }) // delete fails
+      enqueue({ data: null, error: null }) // finalize (failed)
+
+      const op = makePendingOp({
+        operation_type: 'delete_absence',
+        params: { employee_id: 'emp-1', from: '2026-03-02', to: '2026-03-06' },
+      })
+      const result = await commitPendingOperation(supabase as never, 'user-1', 'company-1', op)
+
+      expect(result.status).toBe('failed')
+      expect(result.code).toBe('INTERNAL_ERROR')
+      const updates = findCalls('pending_operations', 'update')
+      const finalize = updates[updates.length - 1]![0] as { result_data?: Record<string, unknown> }
+      expect(finalize.result_data).toMatchObject({ error_code: 'INTERNAL_ERROR' })
+      const logged = consoleError.mock.calls.map((c) => c.join(' ')).join('\n')
+      expect(logged).toContain('delete_absence commit failed')
+      expect(logged).toContain('statement timeout')
+    } finally {
+      consoleError.mockRestore()
+    }
+  })
 })
 
 describe('commitPendingOperation: create_employee', () => {