Modal Web Scheduling Knowledge

Modal Web and Scheduling Knowledge

Use this skill for Modal web endpoints and scheduled jobs. For GPU compute, autoscaling, or storage primitives, use the focused Modal compute or storage skills.

Endpoint routing

• Use @modal.fastapi_endpoint() for simple function-backed HTTP APIs.
• Use @modal.asgi_app() for full FastAPI/Starlette apps, WebSockets, middleware, and routing.
• Use @modal.wsgi_app() for WSGI frameworks.
• Add @modal.concurrent for high-throughput endpoints that can safely handle concurrent inputs per container.
• Test locally with modal serve, then deploy with modal deploy.

Scheduling routing

• Use modal.Cron(...) for calendar schedules and explicit timezones.
• Use modal.Period(...) for interval-based execution.
• Schedules run from deployed apps; modal run is only for manual testing.
• Add retries, timeouts, and idempotency for scheduled ETL or recurring jobs.

Debug checklist

1. Confirm the app is deployed when testing schedules.
2. Check endpoint logs with bounded log streaming.
3. Validate secrets and environment names before deployment.
4. Exercise a minimal request or manual schedule trigger before scaling traffic.