Add a Reminder subtype and dispatch an Event, when a timestamp was passed.

[blizzz]

Is your feature request related to a problem? Please describe.

As a user I would like to have a special DateTime field that dispatches something like a ReminderEvent when the specified date and time was passed, so that another arbitrary app may listen and react to it.

Describe the solution you'd like

• add a "reminder" (better name possible)
• register a background job that will execute at that time
• the background job will dispatch a typed Event
• the Event includes the following data:
  • acting user (who created/updated the column)
  • the Table
  • the Row
  • the Column
  • the Cell
  • the Event is json-serializable, the objects are reduced to their id
• also possible nice-to-have: visual color-based indicator when there is "enough" time until that date (green), it is close to that timestamp (yellow) or when it is reached and passed (red). To be discussed with design, but not critical for this feature.

Describe alternatives you've considered

No response

Additional context

This is required for the upcoming workflow engine efforts.