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data-service-circuit-breaker-aware

Create data fetching services with circuit breaker pattern for API resilience. Services handle fetch, cache, retry, and expose typed data to panel components. Includes clear guidance on when to skip the circuit breaker for user-triggered one-shot calls versus background auto-polling services.

examples/my-daily-monitor/skills/data-service-circuit-breaker-aware/SKILL.md

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# Data Service Pattern

Each panel's data comes from a dedicated **service module** in `src/services/`. Services handle API calls, caching, error handling with circuit breaker pattern.

## Circuit Breaker

The circuit breaker prevents cascading failures when an API is down. After N consecutive failures, it enters "cooldown" mode and serves cached data instead of hitting the API.

Create `src/utils/circuit-breaker.ts`:

```typescript
interface CircuitState {
  failures: number;
  cooldownUntil: number;