A crontab-as-a-service that sends requests to URLs at the given schedule.

• You create a cronjob to send a GET/POST request to a URL at some cron schedule.
• Blitz sends a request to that URL, passing an X-Execution-Id header.
• The app can then send a request to /api/executions/$executionId/status to update if it's completed/failed, optionally with a JSON for including some details.

• Create cronjobs that trigger a URL
• Group cronjobs in projects
• See the recent executions of a cronjob
• Manually trigger a cronjob
• Garbage collector for deleting old executions

• Cronjob creation screen and list of available cronjobs
• Detail screen with recent executions
• An execution and updates to it