Based on my own past experience, don’t blame yourself so much. A lot of these problems you’ve mentioned seem to be all rooted in the fact that there was no one

Based on my own past experience, don’t blame yourself so much. A lot of these problems you’ve mentioned seem to be all rooted in the fact that there was no one there to guide or mentor you or even provide a quick sanity check. For example, I’m surprised a junior has access to make changes on production - for exactly this, accidents. You also mentioned how some of the tickets were for things that even the senior team members had never done before. I’m sensing a lot of red flags here, the first one being they seem to be dumping shit work on the junior member of a team because no one else wants to do it. In my first job I had several of the same problems. A manager that expected me to know everything and would become visibly angry and frustrated when I asked questions. I can remember some of these questions now several years later and in hindsight they were actually reasonable questions but it still angered the manager - which made me stop asking questions and I struggled even more, and his vague explanations were bad enough. This led to me feeling like I was a fairly shit developer that was a pain to everyone and constantly feeling inadequate. But in reality it was the fact that there was no mentorship and little guidance - which also led to a bad production incident once too. Again it is your first job, any perceptions your coworkers and managers have of you exist only to them. Once you change jobs (and honestly I’d maybe consider it sooner rather than later and find a place that properly mentors juniors) you’ll no longer have to feel the way you do now. In the absolute worst case scenario if you do get put on a PIP due to their failings then consider it simply advanced notice of them firing you - it’s a few extra weeks for you to update your CV, interview elsewhere, and bounce. Never stay anywhere that puts you on a PIP or extends your probation period.