feat: Create Phase 5 testing checklist

docs/PHASE_5_TESTING_CHECKLIST.md

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+# Phase 5: Testing Checklist
+
+## Quick Manual Tests (30 min)
+
+### ✅ Test 1: State Machine Flow
+1. Open moderation queue → Click submission
+2. **Check DevTools React Components:** Find `SubmissionReviewManager`
+3. **Verify state transitions:** `idle` → `claiming` → `locked` → `loading_data` → `reviewing`
+4. **Expected:** Items load, no console errors
+
+### ✅ Test 2: Lock Expiry Warning
+1. Claim submission and wait ~13 minutes (or modify DB lock duration to 2 min for testing)
+2. **Expected:** Toast warning appears: "Lock Expiring Soon"
+3. Click to extend lock
+4. **Expected:** Lock renewed, toast confirms
+
+### ✅ Test 3: Approval Flow
+1. Select items → Click "Approve Selected"
+2. **Check state transitions:** `reviewing` → `approving` → `complete`
+3. **Expected:** Success toast with requestId, items approved
+
+### ✅ Test 4: Rejection Flow
+1. Select items → Click "Reject Selected"
+2. Enter reason → Confirm
+3. **Check state:** `reviewing` → `rejecting` → `complete`
+4. **Expected:** Success toast, items rejected
+
+### ✅ Test 5: Illegal Transition Prevention
+1. While in `approving` state, try clicking "Reject"
+2. **Expected:** Button disabled, no console errors
+
+### ✅ Test 6: Error Recovery
+1. Disconnect network → Attempt approval
+2. **Expected:** State shows `error`, "Try Again" button appears
+3. Reconnect → Click "Try Again"
+4. **Expected:** Recovery successful
+
+---
+
+## Database Validation Queries (15 min)
+
+### Query 1: Active Locks
+```sql
+SELECT id, status, locked_until, assigned_to
+FROM content_submissions
+WHERE locked_until > NOW()
+ORDER BY locked_until DESC;
+```
+**Expected:** All locks valid, no expired with status='locked'
+
+### Query 2: Stuck Locks Check
+```sql
+SELECT id, status, locked_until
+FROM content_submissions
+WHERE status = 'locked' 
+  AND locked_until < NOW();
+```
+**Expected:** 0 rows (no stuck locks)
+
+### Query 3: Request Tracking Coverage
+```sql
+SELECT 
+  endpoint,
+  COUNT(*) as request_count,
+  AVG(duration_ms) as avg_duration_ms,
+  COUNT(CASE WHEN error_message IS NOT NULL THEN 1 END) as error_count
+FROM request_metadata
+WHERE created_at > NOW() - INTERVAL '1 hour'
+GROUP BY endpoint
+ORDER BY request_count DESC;
+```
+**Expected:** `process-selective-approval` present with requests
+
+### Query 4: Status Type Safety
+```sql
+SELECT status, COUNT(*) as count
+FROM content_submissions
+WHERE status NOT IN ('draft', 'pending', 'locked', 'reviewing', 'partially_approved', 'approved', 'rejected', 'escalated')
+GROUP BY status;
+```
+**Expected:** 0 rows (all statuses valid)
+
+---
+
+## Performance Check (15 min)
+
+### Test 1: State Machine Overhead
+1. Chrome DevTools → Performance tab → Record
+2. Submit approval flow
+3. Stop recording → Search for "moderationReducer"
+4. **Target:** < 5ms total time
+
+### Test 2: UI Responsiveness
+1. Measure button click → state change
+2. **Target:** < 100ms response time
+
+### Test 3: Memory Leak Check
+1. DevTools Memory tab → Take baseline heap snapshot
+2. Perform 20 form submissions
+3. Force GC (🗑️) → Take second snapshot
+4. Compare snapshots
+5. **Expected:** No significant memory retention
+
+---
+
+## Success Criteria
+
+**Functional:**
+- ✅ State machine controls all submission states
+- ✅ Lock expiry warnings work
+- ✅ Illegal transitions prevented
+- ✅ Error recovery functional
+- ✅ All buttons respect state machine guards
+
+**Quality:**
+- ✅ Zero TypeScript errors
+- ✅ No console errors during normal flow
+- ✅ All manual tests pass
+- ✅ Database shows no orphaned/invalid data
+
+**Performance:**
+- ✅ State machine overhead < 5ms
+- ✅ UI response < 100ms
+- ✅ No memory leaks
+
+---
+
+## Quick Test Commands
+
+```bash
+# Test lock expiry (reduce to 2 min for testing)
+UPDATE content_submissions 
+SET locked_until = NOW() + INTERVAL '2 minutes'
+WHERE id = 'YOUR_SUBMISSION_ID';
+
+# Reset stuck submission
+UPDATE content_submissions 
+SET status = 'pending', locked_until = NULL, assigned_to = NULL
+WHERE id = 'YOUR_SUBMISSION_ID';
+
+# View recent request tracking
+SELECT * FROM request_metadata 
+ORDER BY created_at DESC 
+LIMIT 20;
+```
+
+---
+
+## Issue Checklist
+
+- [ ] All 6 manual tests pass
+- [ ] All 4 database queries return expected results
+- [ ] Performance benchmarks meet targets
+- [ ] No memory leaks detected
+- [ ] Lock monitoring functions correctly
+- [ ] Error recovery works
+- [ ] UI reflects state accurately
+
+**Estimated Time:** 1 hour total