ScheduleID

A unique, auto-incrementing identifier for this row. (int, NOT NULL)

RunTime

When should this task be run? (datetime, NULL)

LastRunTime

When was this task last run? (datetime, NULL)

TaskID

What task should be run, from the lyrTaskDescription table. (int, NOT NULL)

TaskData

Any integer data needed by the task, such as a mailing ID. (int, NULL)