My supervisor's old job is being advertised at work. They want me to apply because I have covered her role while she was on annual leave and know they would not have to train me. There are red flags. My supervisor has burnt out a few times as the job is the posts of 2 people combined into 1 and she has 20+ years experience and very good at her job but it is still too much for 1 person to do. I would only get £200 extra a month and know I would be ill. There is also a backlog of work which will take months to do and they refuse to get temps in to help. I don't want to leave a good job and get stuck in a toxic one that makes me ill.