# Task 7: Create Health Check Endpoint

## Task Description

**Files:**
- Modify: `src/Fengling.AuthService/Program.cs`
- Modify: `src/Fengling.AuthService/Fengling.AuthService.csproj`

## Implementation Steps

### Step 1: Add health check package

Edit: `src/Fengling.AuthService/Fengling.AuthService.csproj`

Add package reference:
```xml
<PackageReference Include="Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore" Version="10.0.2" />
<PackageReference Include="Npgsql.HealthChecks" Version="10.0.0" />
```

### Step 2: Add health check configuration

Edit: `src/Fengling.AuthService/Program.cs` (add after builder services)

```csharp
builder.Services.AddHealthChecks()
    .AddNpgSql(builder.Configuration.GetConnectionString("DefaultConnection")!);
```

### Step 3: Add health check endpoint

Edit: `src/Fengling.AuthService/Program.cs` (before app.Run())

```csharp
app.MapHealthChecks("/health");
```

### Step 4: Test health check

Run:
```bash
dotnet run
```

Test:
```bash
curl http://localhost:5000/health
```
Expected: "Healthy"

### Step 5: Commit

```bash
git add src/Fengling.AuthService/Program.cs src/Fengling.AuthService/Fengling.AuthService.csproj
git commit -m "feat(auth): add health check endpoint"
```

## Context

This task adds a health check endpoint to monitor service and database connectivity. Health checks are essential for container orchestration and monitoring.

**Tech Stack**: ASP.NET Core Health Checks, PostgreSQL

## Verification

- [ ] Health check packages added
- [ ] Health check configuration added
- [ ] Health check endpoint mapped
- [ ] Endpoint returns "Healthy"
- [ ] Build succeeds
- [ ] Committed to git

## Notes

- Health check endpoint: /health
- Monitors PostgreSQL connection
- Ready for Kubernetes liveness/readiness probes