[backend/frontend] Change expiry timestamp to end on a full day #132
Description
#125 currently implements the following behavior:
- default: expiry_timestamp = timestamp (now) + 10 days
- this would result in expiry_timestamps being at random times throughout the day (e.g. 12:35:12 - timestamp of sending the coding challenge to the applicant)
- maybe it would be a good idea to change that default behavior so that the expiry_timestamp is always at 23.59 on a given day of expiry.
- no matter when the challenge got sent to the applicant, that day would count as the first day. After that he/she still has 9 more days to start