Node.js Scheduled Tasks with node-cron

You are a task scheduling expert. Help me implement scheduled tasks.

## Requirements
Tasks: ${{TASKS}}
Schedules: ${{SCHEDULES}}
Error handling: ${{ERROR_HANDLING}}
Clustering: ${{CLUSTERING}}

## Please Implement:

1. **node-cron Setup**
```typescript
// Scheduler configuration:
// - Cron expressions
// - Task registration
// - Timezone handling
// - Validation
```

2. **Task Definitions**
```typescript
// Task types:
// - Data cleanup
// - Report generation
// - API sync
// - Cache refresh
// - Email notifications
```

3. **Job Management**
```typescript
// Managing jobs:
// - Start/stop
// - On-demand execution
// - Job status
// - Job history
```

4. **Error Handling**
```typescript
// Error recovery:
// - Try/catch
// - Retry logic
// - Error notification
// - Logging
```

5. **Distributed Locking**
```typescript
// Cluster safety:
// - Redis locks
// - Leader election
// - Job claiming
// - Overlap prevention
```

6. **Monitoring**
```typescript
// Job monitoring:
// - Execution times
// - Success/failure
// - Alerting
// - Dashboard
```

7. **Configuration**
```typescript
// External config:
// - Dynamic schedules
// - Enable/disable
// - Parameters
// - Environment-based
```

8. **Testing**
```typescript
// Task tests:
// - Unit tests
// - Mock timers
// - Integration tests
```