# Volume Shadow Copy & SDK Database Query Research

## Key Discoveries

###  1. **GeViDB.mdb is Proprietary "MDB1" Format**

**Evidence:**
- File header: `4D 44 42 31 00 10 00 00...` ("MDB1")
- NOT Microsoft Access format (which would start with "Standard Jet DB" or "Standard ACE DB")
- **Cannot be accessed via OLEDB** (Microsoft.ACE.OLEDB or Jet providers)

**Impact:**
Direct database file access is IMPOSSIBLE. Must use Geute brück SDK queries.

---

### 2. **Volume Shadow Copy (VSS) Successfully Copies Locked Database**

**Result:** ✅ VSS CAN copy the file while GeViServer is running

**Script:** `tools\Read-LockedDatabase.ps1`

**Process:**
1. Creates Windows shadow copy of C: drive
2. Creates symbolic link to shadow copy
3. Uses .NET FileStream to copy database (64 MB copied successfully)
4. **BUT:** The copied file is still in MDB1 format (proprietary)

**Conclusion:** VSS works for copying, but doesn't solve the format problem. We still can't read the proprietary database.

---

### 3. **Correct Approach: SDK Database Queries**

**Found example:** `C:\GEVISOFT\Examples\VS2010NET\CS_SimpleDatabaseClient`

**SDK Query Pattern:**
```csharp
// 1. Create query (returns handle)
GeViMessage dbAnswer;
myDB.SendQuery(new GeViDBQ_CreateAlarmQuery(), out dbAnswer);
GeViDBA_QueryHandle handle = (GeViDBA_QueryHandle)dbAnswer;

// 2. Get first record
myDB.SendQuery(new GeViDBQ_GetFirst(handle.sHandle), out dbAnswer);

// 3. Iterate through results
while (dbAnswer is GeViDBA_AlarmEntry alarmEntry) {
    // Process alarm
    string name = alarmEntry.sAlarmTypeName;
    long pk = alarmEntry.sPK;

    // Get next
    myDB.SendQuery(new GeViDBQ_GetNext(handle.sHandle, pk), out dbAnswer);
}

// 4. Close query
myDB.SendQuery(new GeViDBQ_CloseQuery(handle.sHandle), out _);
```

**For Actions:**
```csharp
// Query all actions (0 = all, or specific alarm GlobalID)
myDB.SendQuery(new GeViDBQ_CreateActionQuery(0), out dbAnswer);
// ... same iteration pattern
```

---

## Implementation Status

### ✅ **Completed**

1. **C# SDK Database Query Implementation**
   - File: `SDK/AlarmQueryService.cs`
   - Methods:
     - `QueryAllAlarmsAsync()` - Gets all alarms via SDK
     - `QueryAllActionsAsync()` - Gets all actions via SDK
     - `GetAllActionMappingsAsync()` - Matches alarms with actions
   - **Compiles successfully** ✅
   - **Services running** ✅

2. **VSS Research**
   - Script created: `tools\Read-LockedDatabase.ps1`
   - Tested successfully - can copy locked database
   - Identified proprietary format issue

3. **MDB1 Format Investigation**
   - Identified as Geutebruck proprietary format
   - Confirmed SDK is the ONLY way to query it

### ⚠️ **Remaining Gap: Python API Not Calling SDK Bridge**

**Problem:** Python API service queries PostgreSQL (test data), NOT the SDK Bridge.

**Current Flow:**
```
API Request → Python FastAPI → PostgreSQL (test data) → Response
```

**Needed Flow:**
```
API Request → Python FastAPI → gRPC → C# SDK Bridge → GeViServer SDK → Response
```

**Missing Components:**
1. **Protobuf definition** for ActionMappings service (`.proto` file)
2. **gRPC service** implementation in C# SDK Bridge
3. **gRPC client** call in Python service
4. **Stub initialization** in `sdk_bridge_client.py`

---

## Files Modified/Created

**SDK Bridge (C#):**
- ✅ `SDK/AlarmQueryService.cs` - SDK database queries (COMPLETE)
- ✅ `SDK/ActionMappingHandler.cs` - Uses AlarmQueryService (COMPLETE)
- ⏸️ `Services/ActionMappingGrpcService.cs` - **NOT YET CREATED**

**Python API:**
- ⏸️ `services/action_mapping_service.py` - **Still using PostgreSQL**
- ⏸️ `clients/sdk_bridge_client.py` - **No action mappings stub**

**Protobuf:**
- ⏸️ `Protos/action_mapping.proto` - **NOT YET CREATED**

**Tools:**
- ✅ `tools/Read-LockedDatabase.ps1` - VSS script (COMPLETE)
- ✅ `tools/Check-DatabaseHeader.ps1` - Format checker (COMPLETE)

---

## Next Steps to Complete Integration

### Step 1: Create Protobuf Definition

**File:** `src/sdk-bridge/Protos/action_mapping.proto`

```protobuf
syntax = "proto3";

package action_mapping;

service ActionMappingService {
  rpc GetActionMappings(GetActionMappingsRequest) returns (GetActionMappingsResponse);
}

message GetActionMappingsRequest {
  bool enabled_only = 1;
}

message ActionMapping {
  string id = 1;
  string name = 2;
  string description = 3;
  string input_action = 4;
  repeated string output_actions = 5;
  bool enabled = 6;
}

message GetActionMappingsResponse {
  repeated ActionMapping mappings = 1;
  int32 total_count = 2;
  int32 enabled_count = 3;
  int32 disabled_count = 4;
}
```

### Step 2: Generate gRPC Code

```bash
# Build project (triggers proto code generation)
dotnet build GeViScopeBridge.csproj
python -m grpc_tools.protoc -I. --python_out=. --grpc_python_out=. action_mapping.proto
```

### Step 3: Implement gRPC Service (C#)

**File:** `Services/ActionMappingGrpcService.cs`

```csharp
public class ActionMappingGrpcService : ActionMappingService.ActionMappingServiceBase
{
    private readonly ActionMappingHandler _handler;

    public override async Task<GetActionMappingsResponse> GetActionMappings(
        GetActionMappingsRequest request, ServerCallContext context)
    {
        var mappings = await _handler.EnumerateActionMappingsAsync(request.EnabledOnly);

        return new GetActionMappingsResponse
        {
            Mappings = { mappings.Select(m => new ActionMapping
            {
                Id = m.Id,
                Name = m.Name,
                Description = m.Description,
                InputAction = m.InputAction,
                OutputActions = { m.OutputActions },
                Enabled = m.Enabled
            })},
            TotalCount = mappings.Count,
            EnabledCount = mappings.Count(m => m.Enabled),
            DisabledCount = mappings.Count(m => !m.Enabled)
        };
    }
}
```

### Step 4: Update Python Service

**File:** `services/action_mapping_service.py`

```python
async def list_action_mappings(self, enabled_only=False, ...):
    # Call SDK Bridge via gRPC instead of PostgreSQL
    response = await sdk_bridge_client.get_action_mappings(enabled_only=enabled_only)

    return ActionMappingListResponse(
        mappings=[ActionMappingResponse(**m) for m in response.mappings],
        total_count=response.total_count,
        enabled_count=response.enabled_count,
        disabled_count=response.disabled_count
    )
```

---

## Testing the Solution

Once integration is complete:

```powershell
# 1. Restart services
.\restart-services.ps1

# 2. Test API endpoint
.\test-action-mappings.ps1
```

**Expected Result:** Live data from GeViServer database (not test data)

---

## Summary

| Component | Status | Notes |
|-----------|--------|-------|
| MDB1 Format Investigation | ✅ Complete | Proprietary format, SDK required |
| VSS Script | ✅ Complete | Works but doesn't solve format issue |
| C# SDK Queries | ✅ Complete | AlarmQueryService implemented |
| gRPC Protobuf | ⏸️ Pending | Need to create .proto file |
| C# gRPC Service | ⏸️ Pending | Need to expose SDK queries via gRPC |
| Python gRPC Client | ⏸️ Pending | Need to call SDK Bridge |
| End-to-End Test | ⏸️ Pending | Waiting for gRPC integration |

**Bottom Line:** The SDK database query approach is CORRECT and IMPLEMENTED in C#. We just need to expose it via gRPC so the Python API can call it instead of using PostgreSQL test data.