error-tracking — Claude Code skill: what it does, install

---
name: error-tracking
description: Add Sentry v8 error tracking and performance monitoring to your services. Use this skill when adding error handling, creating new controllers, instrumenting cron jobs, or tracking database performance. ALL ERRORS MUST BE CAPTURED TO SENTRY - no exceptions.
---

# Sentry Integration Skill

## Purpose
This skill enforces comprehensive Sentry error tracking and performance monitoring across all services following Sentry v8 patterns.

## When to Use This Skill
- Adding error handling to any code
- Creating new controllers or routes
- Instrumenting cron jobs
- Tracking database performance
- Adding performance spans
- Handling workflow errors

## 🚨 CRITICAL RULE

**ALL ERRORS MUST BE CAPTURED TO SENTRY** - No exceptions. Never use console.error alone.

## Current Status

### Example: API Service ✅ Complete
- Sentry v8 fully integrated
- All workflow errors tracked
- Background job processors instrumented
- Test endpoints available

## Sentry Integration Patterns

### 1. Controller Error Handling

```typescript
// ✅ CORRECT - Use BaseController
import { BaseController } from '../controllers/BaseController';

export class MyController extends BaseController {
    async myMethod() {
        try {
            // ... your code
        } catch (error) {
            this.handleError(error, 'myMethod'); // Automatically sends to Sentry
        }
    }
}
```

### 2. Route Error Handling (Without BaseController)

```typescript
import * as Sentry from '@sentry/node';

router.get('/route', async (req, res) => {
    try {
        // ... your code
    } catch (error) {
        Sentry.captureException(error, {
            tags: { route: '/route', method: 'GET' },
            extra: { userId: req.user?.id }
        });
        res.status(500).json({ error: 'Internal server error' });
    }
});
```

### 3. Workflow Error Handling

Example of a domain-specific Sentry helper from the original production project. If you build a helper like this for your domain, the call site looks like:

```typescript
import { WorkflowSentryHelper } from '../workflow/utils/sentryHelper';

WorkflowSentryHelper.captureWorkflowError(error, {
    workflowCode: 'INVOICE_APPROVAL',
    instanceId: 123,
    stepId: 456,
    userId: 'user-123',
    operation: 'stepCompletion',
    metadata: { additionalInfo: 'value' }
});
```

Without a helper, plain Sentry works everywhere:

```typescript
Sentry.captureException(error, {
    tags: { operation: 'stepCompletion' },
    extra: { workflowCode: 'INVOICE_APPROVAL', instanceId: 123, userId: 'user-123' }
});
```

### 4. Cron Jobs (MANDATORY Pattern)

```typescript
#!/usr/bin/env node
// FIRST LINE after shebang - CRITICAL!
import '../instrument';
import * as Sentry from '@sentry/node';

async function main() {
    return await Sentry.startSpan({
        name: 'cron.job-name',
        op: 'cron',
        attributes: {
            'cron.job': 'job-name',
            'cron.startTime': new Date().toISOString(),
        }
    }, async () => {
        try {
            // Your cron job logic
        } catch (error) {
            Sentry.captureException(error, {
                tags: {
                    'cron.job': 'job-name',
                    'error.type': 'execution_error'
                }
            });
            console.error('[Job] Error:', error);
            process.exit(1);
        }
    });
}

main()
    .then(() => {
        console.log('[Job] Completed successfully');
        process.exit(0);
    })
    .catch((error) => {
        console.error('[Job] Fatal error:', error);
        process.exit(1);
    });
```

### 5. Database Performance Monitoring

Example from the original production project - a small helper that wraps DB calls in Sentry spans. Adapt to your codebase:

```typescript
import { DatabasePerformanceMonitor } from '../utils/databasePerformance';

const result = await DatabasePerformanceMonitor.withPerformanceTracking(
    'findMany',
    'UserProfile',
    async () => {
        return await PrismaService.main.userProfile.findMany({
            take: 5,
        });
    }
);
```

The universally-available equivalent is a direct Sentry span:

```typescript
const result = await Sentry.startSpan({
    name: 'db.userProfile.findMany',
    op: 'db.query',
    attributes: { 'db.model': 'UserProfile', 'db.operation': 'findMany' }
}, async () => {
    return await prisma.userProfile.findMany({ take: 5 });
});
```

### 6. Async Operations with Spans

```typescript
import * as Sentry from '@sentry/node';

const result = await Sentry.startSpan({
    name: 'operation.name',
    op: 'operation.type',
    attributes: {
        'custom.attribute': 'value'
    }
}, async () => {
    // Your async operation
    return await someAsyncOperation();
});
```

## Error Levels

Use appropriate severity levels:

- **fatal**: System is unusable (database down, critical service failure)
- **error**: Operation failed, needs immediate attention
- **warning**: Recoverable issues, degraded performance
- **info**: Informational messages, successful operations
- **debug**: Detailed debugging information (dev only)

## Required Context

```typescript
import * as Sentry from '@sentry/node';

Sentry.withScope((scope) => {
    // ALWAYS include these if available
    scope.setUser({ id: userId });
    scope.setTag('service', 'api'); // your service name
    scope.setTag('environment', process.env.NODE_ENV);

    // Add operation-specific context
    scope.setContext('operation', {
        type: 'workflow.start',
        workflowCode: 'INVOICE_APPROVAL',
        entityId: 123
    });

    Sentry.captureException(error);
});
```

## Service Integration Examples

### API Service (Example)

**Location**: `./api/src/instrument.ts`

```typescript
import * as Sentry from '@sentry/node';
import { nodeProfilingIntegration } from '@sentry/profiling-node';

Sentry.init({
    dsn: process.env.SENTRY_DSN,
    environment: process.env.NODE_ENV || 'development',
    integrations: [
        nodeProfilingIntegration(),
    ],
    tracesSampleRate: 0.1,
    profilesSampleRate: 0.1,
});
```

**Key Helpers**:
- Custom Sentry helpers for domain-specific errors
- `DatabasePerformanceMonitor` - DB query tracking
- `BaseController` - Controller error handling

### Notifications Service (Example)

**Location**: `./notifications/src/instrument.ts`

```typescript
import * as Sentry from '@sentry/node';
import { nodeProfilingIntegration } from '@sentry/profiling-node';

Sentry.init({
    dsn: process.env.SENTRY_DSN,
    environment: process.env.NODE_ENV || 'development',
    integrations: [
        nodeProfilingIntegration(),
    ],
    tracesSampleRate: 0.1,
    profilesSampleRate: 0.1,
});
```

**Key Helpers**:
- Service-specific Sentry helpers for domain errors
- `BaseController` - Controller error handling

## Configuration (config.ini)

```ini
[sentry]
dsn = your-sentry-dsn
environment = development
tracesSampleRate = 0.1
profilesSampleRate = 0.1

[databaseMonitoring]
enableDbTracing = true
slowQueryThreshold = 100
logDbQueries = false
dbErrorCapture = true
enableN1Detection = true
```

## Testing Sentry Integration

### Example Test Endpoints

```bash
# Test basic error capture
curl http://localhost:3000/api/sentry/test-error

# Test performance tracking
curl http://localhost:3000/api/sentry/test-performance

# Test database performance
curl http://localhost:3000/api/sentry/test-database-performance
```

Create test endpoints in your services to verify Sentry integration works end-to-end.

## Performance Monitoring

### Requirements

1. **All API endpoints** must have transaction tracking
2. **Database queries > 100ms** are automatically flagged
3. **N+1 queries** are detected and reported
4. **Cron jobs** must track execution time

### Transaction Tracking

```typescript
import * as Sentry from '@sentry/node';

// Automatic transaction tracking for Express routes
app.use(Sentry.Handlers.requestHandler());
app.use(Sentry.Handlers.tracingHandler());

// Manual transaction for custom operations
const transaction = Sentry.startTransaction({
    op: 'operation.type',
    name: 'Operation Name',
});

try {
    // Your operation
} finally {
    transaction.finish();
}
```

## Common Mistakes to Avoid

❌ **NEVER** use console.error without Sentry
❌ **NEVER** swallow errors silently
❌ **NEVER** expose sensitive data in error context
❌ **NEVER** use generic error messages without context
❌ **NEVER** skip error handling in async operations
❌ **NEVER** forget to import instrument.ts as first line in cron jobs

## Implementation Checklist

When adding Sentry to new code:

- [ ] Imported Sentry or appropriate helper
- [ ] All try/catch blocks capture to Sentry
- [ ] Added meaningful context to errors
- [ ] Used appropriate error level
- [ ] No sensitive data in error messages
- [ ] Added performance tracking for slow operations
- [ ] Tested error handling paths
- [ ] For cron jobs: instrument.ts imported first

## Key Files (Typical Structure)

### Per Service
- `src/instrument.ts` - Sentry initialization (imported first)
- `src/utils/sentryHelper.ts` - Domain-specific error helpers
- `src/utils/databasePerformance.ts` - DB monitoring
- `src/controllers/BaseController.ts` - Controller base with Sentry

### Configuration
- `config.ini` or `.env` - Sentry DSN and settings
- `sentry.ini` - Shared Sentry config (optional)