nettu-scheduler

May I ask you why you would want to store booking slots? I think the right approach is to recalculate available booking slots everytime (via the nettu-scheduler api) a customer asks for it. And then also store the confirmed booking timespan as a calendar event in nettu-scheduler so that the instructor will not be bookable again during that time. You can have a look at this example: https://github.com/fmeringdal/nettu-scheduler/blob/master/ex...

From my experience it is a common mistake to do overlap comparisons of intervals this way. https://github.com/fmeringdal/nettu-scheduler/blob/df737e128... IMO start time should be treated as inclusive, and end time as exclusive. E.g. an event from 1pm-2pm does not overlap with an event starting at 2pm because it's end-time is defined as exclusive. Therefore you need to replace one of you greater/lower-than's with a normal greater/lower comparison operator.