TimerFixedRate

Recurring timer that fires at a fixed interval.

Properties

Property	Type	Description
`Period`	`BigInt`	Interval in milliseconds
`Payload`	`any`	Data passed to the timer callback
`StartAt`	`DateTime`	Optional — delay first execution until this time

{
    Period: 60000n,               // Every 60 seconds
    Payload: { jobType: 'heartbeat' },
    StartAt: DateTime.now().plusMinutes(5)
}