# DX002A — Supabase Mirror Foundation
## Walkthrough

---

## Status

| Check | Result |
|-------|--------|
| PHP Lint (12 files) | ✅ 12/12 passed |
| Service Role Key security audit | ✅ Never rendered to browser |
| No data written to MySQL | ✅ All queries SELECT / read-only |
| No data written to Supabase | ✅ Connection test is GET-only |
| No synchronization performed | ✅ DX002B scope preserved |
| Placeholder actions added | ✅ All 5 DX002B buttons present |

---

## Files Created

### Configuration
| File | Purpose |
|------|---------|
| [`config/supabase.php`](file:///c:/xampp/htdocs/inveetaire/config/supabase.php) | Supabase credentials config (follows database.php pattern) |
| [`.env`](file:///c:/xampp/htdocs/inveetaire/.env) | Added 5 Supabase keys as empty placeholders |

### Services (New)
| File | Purpose |
|------|---------|
| [`MySqlInspectorService.php`](file:///c:/xampp/htdocs/inveetaire/app/modules/Developer/MySqlInspectorService.php) | Full MySQL inspection: charset, collation, engine, rows, size |
| [`SupabaseService.php`](file:///c:/xampp/htdocs/inveetaire/app/modules/Developer/SupabaseService.php) | Connection test (file_get_contents), project info, masked credentials |
| [`SchemaReaderService.php`](file:///c:/xampp/htdocs/inveetaire/app/modules/Developer/SchemaReaderService.php) | MySQL table listing, column detail, Supabase table list, comparison |

### Controller (Updated)
| File | Changes |
|------|---------|
| [`DeveloperController.php`](file:///c:/xampp/htdocs/inveetaire/app/modules/Developer/DeveloperController.php) | +4 new methods: `supabase()`, `inspector()`, `mappingDoc()`, `testSupabaseConnection()` |

### Views (New/Updated)
| File | Purpose |
|------|---------|
| [`database.php`](file:///c:/xampp/htdocs/inveetaire/app/views/developer/database.php) | Full MySQL Inspector + Supabase Mirror section (live/not-configured) |
| [`supabase.php`](file:///c:/xampp/htdocs/inveetaire/app/views/developer/supabase.php) | Supabase inspector with AJAX test button + DX002B placeholders |
| [`inspector.php`](file:///c:/xampp/htdocs/inveetaire/app/views/developer/inspector.php) | Side-by-side MySQL vs Supabase with full table inventory |
| [`mapping.php`](file:///c:/xampp/htdocs/inveetaire/app/views/developer/mapping.php) | MySQL→PostgreSQL type mapping reference |
| [`console.php`](file:///c:/xampp/htdocs/inveetaire/app/views/developer/console.php) | 3 new DX002A feature cards added |

### Layout & Routes (Updated)
| File | Changes |
|------|---------|
| [`layouts/developer.php`](file:///c:/xampp/htdocs/inveetaire/app/views/layouts/developer.php) | New "Supabase Mirror" sidebar section with 3 nav links + badge updated to DX002A |
| [`routes/developer.php`](file:///c:/xampp/htdocs/inveetaire/routes/developer.php) | +4 routes (3 GET, 1 POST AJAX) |

### Documentation
| File | Purpose |
|------|---------|
| [`MYSQL_TO_POSTGRES_MAPPING.md`](file:///c:/xampp/htdocs/inveetaire/docs/database/MYSQL_TO_POSTGRES_MAPPING.md) | Full type mapping guide with INVEETAIRE-specific notes |

---

## New Routes

| Method | URL | Handler | Purpose |
|--------|-----|---------|---------|
| GET | `/app/developer/supabase` | `supabase()` | Supabase inspector page |
| POST | `/app/developer/supabase/test` | `testSupabaseConnection()` | AJAX connection test (JSON) |
| GET | `/app/developer/inspector` | `inspector()` | Side-by-side DB inspector |
| GET | `/app/developer/mapping` | `mappingDoc()` | Type mapping reference |

---

## Security Implementation

| Credential | Display Method |
|-----------|---------------|
| SUPABASE_URL | `https://abcd*****.supabase.co` |
| SUPABASE_ANON_KEY | `eyJhbGci••••••••••••` |
| SUPABASE_SERVICE_ROLE_KEY | `••••••••••••••••` (boolean flag only: `has_service_role`) |
| SUPABASE_PROJECT_REF | `abcd*****` |

The `SupabaseService` stores `service_role_key` privately and **never returns it** from any method called from a view. The `DeveloperController` never accesses the key directly.

---

## Connection Test Flow

```
"Test Connection" button (JavaScript fetch())
    ↓
POST /app/developer/supabase/test (AJAX, no page reload)
    ↓
DeveloperController@testSupabaseConnection
    ↓
SupabaseService::testConnection()
    ↓
GET {SUPABASE_URL}/rest/v1/ — using anon key only (read-only)
    ↓
JSON response → browser updates status card
```

**Zero data written. Zero side effects.**

---

## Deferred to DX002B

| Feature | Status |
|---------|--------|
| Push to Supabase | Disabled placeholder button |
| Pull from Supabase | Disabled placeholder button |
| Verify Mirror | Disabled placeholder button |
| Generate Schema | Disabled placeholder button |
| Compare Schema | Disabled placeholder button |
| Column-level schema diff | `SchemaReaderService` foundation ready |
| DDL generation | `SchemaReaderService` foundation ready |
| Automated synchronization | Architecture documented |
