# Phase 2 Migration Summary

> Version: V4.0 | Date: 2026-04-28
> Status: Completed (Code Ready, Migration Pending)

---

## Completed Tasks

| Task | Status | Details |
|------|--------|---------|
| **DB Migration Scripts** | ✅ | 026, 027, 028 created |
| **New Binding API** | ✅ | identity_binding_v4.rs (473 lines) |
| **Routes Registration** | ✅ | 5 new endpoints |
| **Module Export** | ✅ | mod.rs updated |

---

## New API Endpoints

| Endpoint | Method | Description |
|----------|--------|-------------|
| `/api/v1/identities/register` | POST | Register identity from face_ids |
| `/api/v1/identities/:uuid/bind` | POST | Bind faces to identity |
| `/api/v1/identities/:uuid/unbind` | POST | Unbind faces from identity |
| `/api/v1/faces/candidates` | GET | List unregistered faces |
| `/api/v1/files/:uuid/identity-stats` | GET | Get file identity stats |

---

## Migration Files Created

| File | Purpose |
|------|---------|
| `migrations/025_rename_video_uuid_to_file_uuid.sql` | Rename columns |
| `migrations/026_create_file_identities_table.sql` | N:N relationship table |
| `migrations/027_add_identity_id_to_face_detections.sql` | Add foreign key |
| `migrations/028_drop_person_identities_table.sql` | Remove old architecture |

---

## Files Modified

| File | Changes |
|------|--------|
| `src/api/mod.rs` | Add identity_binding_v4 module |
| `src/api/server.rs` | Register new routes |
| `src/api/identity_binding_v4.rs` | New binding logic |

---

## Next Steps

### 1. Run DB Migrations

```bash
# Connect to dev schema
psql -U accusys -d momentry -c "SET search_path TO dev;"

# Run migrations
psql -U accusys -d momentry -f migrations/025_rename_video_uuid_to_file_uuid.sql
psql -U accusys -d momentry -f migrations/026_create_file_identities_table.sql
psql -U accusys -d momentry -f migrations/027_add_identity_id_to_face_detections.sql
psql -U accusys -d momentry -f migrations/028_drop_person_identities_table.sql
```

### 2. Update SQLx Cache

```bash
cargo sqlx prepare
```

### 3. Test New Endpoints

```bash
cargo run --bin momentry_playground -- server

# Test candidates API
curl "http://localhost:3003/api/v1/faces/candidates?min_confidence=0.8"

# Test register API
curl -X POST "http://localhost:3003/api/v1/identities/register" \
  -H "Content-Type: application/json" \
  -d '{"face_ids": [100], "name": "Test Person"}'
```

---

## Compilation Status

- **Code Structure**: ✅ Correct
- **Type Safety**: ⏸ Pending DB migration
- **SQLx Cache**: ⏸ Need `cargo sqlx prepare` after migration

---

## Architecture Comparison

| Aspect | V3.x | V4.0 |
|--------|------|------|
| **Binding Layer** | 3 (Face → Person → Identity) | 2 (Face → Identity) |
| **Tables** | person_identities + person_appearances | file_identities |
| **API Endpoints** | 33 | 15 |
| **Person ID** | Video-local | ❌ Removed |
| **Chunk Binding** | Manual | Auto (time alignment) |

---

## Version History

| Version | Date | Changes |
|---------|------|---------|
| V4.0 | 2026-04-28 | Two-layer architecture complete |
