# DX002B — Supabase Mirror Synchronization Engine
## Walkthrough

---

## Final Validation

| Check | Result |
|-------|--------|
| PHP Lint (12 files) | ✅ 12/12 passed |
| service_role_key in views | ✅ Only label text — never a value |
| access_token in views | ✅ Only configuration instruction text |
| access_token returned to browser | ✅ Never — server-side only |
| dryRun() calls executeSqlViaMgmtApi | ✅ Never — confirmed by audit |
| Pull from Supabase | ✅ Disabled with "Disaster Recovery" explanation |
| Automatic synchronization | ✅ None — manual only |
| MySQL remains source of truth | ✅ All app queries still MySQL |

---

## Files Created (DX002B)

### Services (New)
| File | Purpose |
|------|---------|
| [`DdlGeneratorService.php`](file:///c:/xampp/htdocs/inveetaire/app/modules/Developer/DdlGeneratorService.php) | MySQL→PostgreSQL DDL generator. All 37 type mappings. CREATE TABLE, ALTER TABLE, incremental diff. |
| [`MirrorVerifierService.php`](file:///c:/xampp/htdocs/inveetaire/app/modules/Developer/MirrorVerifierService.php) | Mirror integrity: table count, columns, types, indexes. Returns healthy/warning/error. |
| [`SyncLogService.php`](file:///c:/xampp/htdocs/inveetaire/app/modules/Developer/SyncLogService.php) | JSON file log at `storage/developer/sync_log.json`. Max 200 entries. |
| [`SynchronizationService.php`](file:///c:/xampp/htdocs/inveetaire/app/modules/Developer/SynchronizationService.php) | Main orchestrator: dryRun, compare, generatePreview, push, verify, getLogs. |

### Services (Extended)
| File | Changes |
|------|---------|
| [`SchemaReaderService.php`](file:///c:/xampp/htdocs/inveetaire/app/modules/Developer/SchemaReaderService.php) | +getMysqlFullSchema() (columns/PKs/FKs/indexes), +getSupabaseFullSchema() (Management API), +compareFullSchema() (full column diff). |

### Controller (Extended)
| File | Changes |
|------|---------|
| [`DeveloperController.php`](file:///c:/xampp/htdocs/inveetaire/app/modules/Developer/DeveloperController.php) | +6 methods: sync(), syncLog(), syncCompare(), syncDryRun(), syncPush(), syncVerify(), syncPreview(), syncLogClear() |

### Views (New)
| File | Purpose |
|------|---------|
| [`sync.php`](file:///c:/xampp/htdocs/inveetaire/app/views/developer/sync.php) | Sync dashboard. Compare, Dry Run, Generate Schema (Incremental/Full), Push (with confirmation modal), Verify Mirror, Pull disabled, recent history. |
| [`sync_log.php`](file:///c:/xampp/htdocs/inveetaire/app/views/developer/sync_log.php) | Full sync history table with stats cards and Clear Log button. |

### Views (Updated)
| File | Changes |
|------|---------|
| [`console.php`](file:///c:/xampp/htdocs/inveetaire/app/views/developer/console.php) | Sync card now active (links to /sync). Sync Log card added. |
| [`layouts/developer.php`](file:///c:/xampp/htdocs/inveetaire/app/views/layouts/developer.php) | Synchronization + Sync Log nav links now active. Badge updated to DX002B v1.0.0. |

### Configuration (Updated)
| File | Changes |
|------|---------|
| [`.env`](file:///c:/xampp/htdocs/inveetaire/.env) | Added `SUPABASE_ACCESS_TOKEN` |
| [`config/supabase.php`](file:///c:/xampp/htdocs/inveetaire/config/supabase.php) | Added `access_token`, `management_api_url` |

### Routes (Updated)
| File | Changes |
|------|---------|
| [`routes/developer.php`](file:///c:/xampp/htdocs/inveetaire/routes/developer.php) | +8 new routes (6 POST AJAX + 2 GET pages) |

### Storage (New)
| Path | Purpose |
|------|---------|
| `storage/developer/` | Developer-only storage directory |
| `storage/developer/sync_log.json` | Created at runtime by SyncLogService |

### Documentation (New)
| File | Purpose |
|------|---------|
| [`SYNC_WORKFLOW.md`](file:///c:/xampp/htdocs/inveetaire/docs/database/SYNC_WORKFLOW.md) | Full sync workflow docs, architecture, troubleshooting |

---

## New Routes

| Method | URL | Handler | Purpose |
|--------|-----|---------|---------|
| GET | `/app/developer/sync` | `sync()` | Sync dashboard |
| GET | `/app/developer/sync/log` | `syncLog()` | History page |
| POST | `/app/developer/sync/compare` | `syncCompare()` | AJAX: schema diff |
| POST | `/app/developer/sync/dry-run` | `syncDryRun()` | AJAX: simulate push |
| POST | `/app/developer/sync/push` | `syncPush()` | AJAX: execute push |
| POST | `/app/developer/sync/verify` | `syncVerify()` | AJAX: mirror check |
| POST | `/app/developer/sync/preview` | `syncPreview()` | AJAX: SQL preview |
| POST | `/app/developer/sync/log/clear` | `syncLogClear()` | Clear log JSON |

---

## Synchronization Flow

```
1. Dry Run  →  Compare + Generate SQL → Log (is_dry_run=true) — NO execution
2. Compare  →  Get structured diff (missing/matched/modified)
3. Preview  →  Download/copy SQL (no execution)
4. Push     →  [Has PAT?] → Management API execution → Auto-verify → Log
              [No PAT?]  → SQL Export Mode → Download + manual paste
5. Verify   →  Full integrity check → healthy/warning/error status
```

---

## Assumptions

1. **pdo_pgsql is unavailable** — confirmed in XAMPP. Management API approach used.
2. **Supabase Access Token** is separate from service_role_key — requires the user to generate a PAT at `supabase.com/dashboard/account/tokens`.
3. **FK ordering** — DDL generator outputs tables without FKs first, then adds FK constraints separately (avoids dependency ordering issues).
4. **Sync log** is stored as JSON file — no MySQL table needed. Max 200 entries.
5. **Type compatibility** uses alias-based matching (bigint=int8, bool=boolean, etc.) to avoid false positives in the verifier.
6. **Push confirmation** requires user to type "confirm" in the modal — prevents accidental pushes.