# ⚡ Quick Fix Summary - Truth Source

**Problem:** Admin changes → User refresh → Data lost ❌  
**Solution:** Firestore = Single Source of Truth ✅

---

## 🔧 What Changed

### Backend: `auth.service.ts`
```typescript
// ✅ FIXED: Only update identity, preserve business data
async syncAuth0User(authUser) {
  const safeUpdates = {
    email: authUser.email,
    displayName: authUser.name,
    lastLoginAt: new Date()
    // ⚠️ NEVER: plan, subscription, quota, roles
  }
  await firestore.update(userId, safeUpdates)
}
```

### Frontend: `authStore.ts`
```typescript
// ✅ FIXED: Token = identity only, load business data from API
function parseClaims(claims) {
  return {
    email: claims.email,
    displayName: claims.name,
    // ⚠️ NO plan/subscription from token
  }
}

// ✅ Always load from backend API (reads Firestore)
const profile = await fetch('/api/auth/me')
```

---

## 🎯 Key Rule

**Auth0 Token:** Identity (email, name, photo) ONLY  
**Firestore:** Business data (plan, subscription, quota, roles, status)  
**Backend API:** Always reads from Firestore  
**Frontend:** Always loads from backend API

---

## ✅ Tests

- TypeScript: ✅ 0 errors
- Build: ✅ API + Web OK
- Lint: ✅ 0 warnings
- PWA: ✅ 171 files

---

## 📁 Files

**Modified:**
- `apps/api/src/modules/auth/auth.service.ts`
- `apps/web/src/modules/auth/stores/authStore.ts`

**Docs:**
- `TRUTH_SOURCE_FIX_COMPLETE.md` (full details)
- `docs/modules/AUTH.md` (architecture)
- `.github/instructions/TRUTH_SOURCE_RULES.md` (rules)

---

**Status:** ✅ RESOLVED  
**Deploy:** Backend first, then frontend  
**Impact:** High (fixes critical admin bug)
