That's very similar to Ashildr in Dr. Who. The character was an immortal who did not have perfect memory. She would write down her memories, but would sometimes

That's very similar to Ashildr in Dr. Who. The character was an immortal who did not have perfect memory. She would write down her memories, but would sometimes rip out pages or burn entire journals to let her memory fail and then forget. She survives to the end of the universe and then a bit more, in the show at least. https://tardis.fandom.com/wiki/Ashildr https://tardis.fandom.com/wiki/Ashildr