diff --git a/web/src/stores/sft.test.ts b/web/src/stores/sft.test.ts
index d2bec40..4177253 100644
--- a/web/src/stores/sft.test.ts
+++ b/web/src/stores/sft.test.ts
@@ -3,28 +3,31 @@ import { useSftStore } from './sft'
 import type { SftQueueItem } from './sft'
 import { beforeEach, describe, it, expect } from 'vitest'
 
-const MOCK_ITEM: SftQueueItem = {
-  id: 'abc',
-  source: 'cf-orch-benchmark',
-  benchmark_run_id: 'run1',
-  timestamp: '2026-04-07T10:00:00Z',
-  status: 'needs_review',
-  prompt_messages: [
-    { role: 'system', content: 'You are a coding assistant.' },
-    { role: 'user', content: 'Write a Python add function.' },
-  ],
-  model_response: 'def add(a, b): return a - b',
-  corrected_response: null,
-  quality_score: 0.2,
-  failure_reason: 'pattern_match: 0/2 matched',
-  task_id: 'code-fn',
-  task_type: 'code',
-  task_name: 'Code: Write a Python function',
-  model_id: 'Qwen/Qwen2.5-3B',
-  model_name: 'Qwen2.5-3B',
-  node_id: 'heimdall',
-  gpu_id: 0,
-  tokens_per_sec: 38.4,
+function makeMockItem(overrides: Partial<SftQueueItem> = {}): SftQueueItem {
+  return {
+    id: 'abc',
+    source: 'cf-orch-benchmark',
+    benchmark_run_id: 'run1',
+    timestamp: '2026-04-07T10:00:00Z',
+    status: 'needs_review',
+    prompt_messages: [
+      { role: 'system', content: 'You are a coding assistant.' },
+      { role: 'user', content: 'Write a Python add function.' },
+    ],
+    model_response: 'def add(a, b): return a - b',
+    corrected_response: null,
+    quality_score: 0.2,
+    failure_reason: 'pattern_match: 0/2 matched',
+    task_id: 'code-fn',
+    task_type: 'code',
+    task_name: 'Code: Write a Python function',
+    model_id: 'Qwen/Qwen2.5-3B',
+    model_name: 'Qwen2.5-3B',
+    node_id: 'heimdall',
+    gpu_id: 0,
+    tokens_per_sec: 38.4,
+    ...overrides,
+  }
 }
 
 describe('useSftStore', () => {
@@ -38,37 +41,37 @@ describe('useSftStore', () => {
 
   it('current returns first item', () => {
     const store = useSftStore()
-    store.queue = [MOCK_ITEM]
+    store.queue = [makeMockItem()]
     expect(store.current?.id).toBe('abc')
   })
 
   it('removeCurrentFromQueue removes first item', () => {
     const store = useSftStore()
-    const second = { ...MOCK_ITEM, id: 'def' }
-    store.queue = [MOCK_ITEM, second]
+    const second = makeMockItem({ id: 'def' })
+    store.queue = [makeMockItem(), second]
     store.removeCurrentFromQueue()
     expect(store.queue[0].id).toBe('def')
   })
 
   it('restoreItem adds to front of queue', () => {
     const store = useSftStore()
-    const second = { ...MOCK_ITEM, id: 'def' }
+    const second = makeMockItem({ id: 'def' })
     store.queue = [second]
-    store.restoreItem(MOCK_ITEM)
+    store.restoreItem(makeMockItem())
     expect(store.queue[0].id).toBe('abc')
     expect(store.queue[1].id).toBe('def')
   })
 
   it('setLastAction records the action', () => {
     const store = useSftStore()
-    store.setLastAction('discard', MOCK_ITEM)
+    store.setLastAction('discard', makeMockItem())
     expect(store.lastAction?.type).toBe('discard')
     expect(store.lastAction?.item.id).toBe('abc')
   })
 
   it('clearLastAction nulls lastAction', () => {
     const store = useSftStore()
-    store.setLastAction('flag', MOCK_ITEM)
+    store.setLastAction('flag', makeMockItem())
     store.clearLastAction()
     expect(store.lastAction).toBeNull()
   })
diff --git a/web/src/stores/sft.ts b/web/src/stores/sft.ts
index f65d1a0..68b765c 100644
--- a/web/src/stores/sft.ts
+++ b/web/src/stores/sft.ts
@@ -12,7 +12,7 @@ export interface SftQueueItem {
   model_response: string
   corrected_response: string | null
   quality_score: number          // 0.0 to 1.0
-  failure_reason: string
+  failure_reason: string | null
   task_id: string
   task_type: string
   task_name: string