How to gracefully restart a HTTP API with timers

Question

I have a HTTP api written in golang on the go-fiber framework that handles bookings.

type Booking struct {
  Active    bool      `bson:"active"`
  Created   time.Time `bson:"created"`
  StartDate time.Time `bson:"start_date"`
  EndDate   time.Time `bson:"end_date"`
}

When a booking is created, I want to be able to send the user a notification when that booking starts, etc. These notifications are important. I also want a timer to be set which'll automatically set the booking to inactive (active: false).

If this program were to crash, or I have to restart it due to updates, all those timers would be gone.

How should I implement a system which'll gracefully restart the API and persist those timers?

My idea: When the program restarts, I can just query & iterate through all bookings where active: true and start those timers again. Seems obvious enough?

I'd like to know if there's any other practical solution or if there's any "best practices"?