Is past self harm a deal breaker?

I will be honest I've made a fair few mistakes and had some poor points with my mental health. Which led me down cutting myself. I do regret it, but not since I'm slowly getting better. Haven't done it in over a year now. I'm starting to have several questions about it and if perhaps it would be an issue in finding a realtionship. And so I was sorrt of hoping to get some advice and maybe some answers to the following questions.

Is past self harm a deal breaker?
When would you want a partner to say anything regarding this to you?
How early in a relationship should it be brought up?
Is past self harm a deal breaker?
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