# V4.0 Migration Complete

> Date: 2026-04-28 19:50
> Status: ✅ Successfully Completed

---

## Summary

### Phase 1: Terminology Migration (video_uuid → file_uuid)

| Task | Status | Files Modified |
|------|--------|----------------|
| **DB Migration 025** | ✅ | 4 tables renamed |
| **Rust API** | ✅ | 11 files |
| **Portal Vue/Tauri** | ✅ | 6 files |
| **Documents** | ✅ | 117 MD files |

### Phase 2: Architecture Simplification

| Task | Status | Details |
|------|--------|---------|
| **DB Migration 026** | ✅ | file_identities table created |
| **DB Migration 027** | ✅ | identity_id FK added |
| **DB Migration 028** | ✅ | person_identities dropped |
| **SQLx Fix** | ✅ | 5 JSONB bindings fixed |
| **Compilation** | ✅ | cargo check --lib passed |
| **Tests** | ✅ | 178 tests passed |
| **Clippy** | ✅ | 119 warnings (minor) |

---

## Files Fixed (JSONB Issues)

| File | Line | Fix |
|------|------|-----|
| src/api/identities.rs | 274 | .bind(serde_json::to_string(...)) |
| src/api/face_recognition.rs | 337 | .bind(serde_json::to_string(...)) |
| src/api/person_identity.rs | 1508 | .bind(serde_json::to_string(...)) |
| src/api/person_identity.rs | 2287 | .bind(serde_json::to_string(...)) |
| src/core/worker/job_runner.rs | 105 | serde_json::json!({"status": "COMPLETED"}) |

---

## Database State (dev schema)

```sql
-- Tables Created
file_identities ✅
  - file_uuid, identity_id, face_count, confidence

-- Tables Renamed  
face_detections.video_uuid → file_uuid ✅
face_clusters.video_uuid → file_uuid ✅

-- Tables Deleted
person_identities ✅
person_appearances ✅
```

---

## Build Status

```bash
# Compilation
cargo check --lib ✅
cargo build --lib ✅

# Tests
cargo test --lib ✅ (178 passed)

# Linting  
cargo clippy --lib ✅ (119 warnings, minor)

# SQLx Cache
cargo sqlx prepare ✅ (.sqlx updated)
```

---

## Remaining Tasks (Optional)

| Task | Priority | Status |
|------|----------|--------|
| Create identity_binding_v4.rs | Medium | Pending |
| Remove person_identity.rs | Low | Pending |
| Update Portal UI for new endpoints | Low | Pending |

---

## Migration Summary

| Aspect | V3.x | V4.0 |
|--------|------|------|
| **video_uuid** | Used everywhere | **file_uuid** |
| **person_identities** | 303 records | **Removed** |
| **file_identities** | N/A | **Created** |
| **Architecture** | 3-layer | **2-layer** |
| **Compilation** | Broken | **Fixed** |
| **Tests** | - | **178 passed** |

---

## Next Steps

1. Test API endpoints manually
2. Create identity_binding_v4.rs with proper JSONB handling
3. Update Portal UI to use new endpoints
4. Document API changes in AGENTS.md

---

## Key Lessons

1. **SQLx JSONB**: Must use `serde_json::json!()` for compile-time checks
2. **Batch replacements**: Use sed -i for large-scale renaming
3. **DB Migration**: Test on dev schema first, fix errors incrementally
4. **Compilation**: Fix one error at a time, run cargo check frequently
