Support Cron-like Scheduled Refresh for Dashboards in Superset

[chen131311]

Hi there,
I'm an enthusiastic user of Superset and have found it incredibly useful for visualizing data. However, one key functionality that seems to be lacking is the ability to schedule dashboard refreshes in a way that mimics the flexibility of cron jobs.
In many use cases, data is constantly updated, and having dashboards that can refresh automatically at custom intervals - similar to how cron allows for precise scheduling in a Unix environment - would greatly enhance the utility of Superset. For example, we might want a particular dashboard that showcases daily sales figures to refresh every morning at 3:00 AM, or a real-time analytics dashboard for website traffic to update every 5 minutes.
Currently, the existing refresh mechanisms in Superset do not offer this level of granularity and flexibility. It would be fantastic if we could define schedules like we do in crontab expressions (e.g., 0 3 * * * for a daily 3 AM run, or */5 * * * * for every 5 minutes) for dashboard refreshes.
I believe this feature addition would not only make Superset more competitive but also improve the overall user experience for those relying on up-to-date visualizations. Looking forward to seeing this functionality in future releases.