It is possible to rewrite memories apparently... : https://www.brainreach.ca/blog-en/can-we-rewrite-our-memories
It can be used to make a bad memory seem less bad and be used to treat PTSD even apparently... : https://www.hopementalhealth.com/blog/rewriting-traumatic-memories & : https://www.newscientist.com/article/mg23331110-700-spotless-mind-manipulating-the-brain-to-rewrite-memories/
Fascinating stuff : https://www.npr.org/sections/health-shots/2014/02/04/271527934/our-brains-rewrite-our-memories-putting-present-in-the-past