# Classes Implementation Notes

## ATC availability lookup gotcha
- ATC public-read `availability` can return empty slots for far-future dates.
- `/classes-by-date` therefore requests ATC availability without the offer start-date filter so the view can show any real public slots instead of a blank state when offers are scheduled far ahead.
- `/classes` and `/classes/[offerId]` keep the date-filtered lookup so the detail view remains tied to the offer date.