Hmm... I'm not sure either of what you're looking for exists as a mod yet. To be honest, I don't think there's ever been an in-game custom mod that actually edits/erases memories on purpose... but I'd try what theraven suggested if you have Apartment Life.
And for future reference, please don't forget to put what you're looking for in your title also, since it's a section rule. (i.e. WCIF: Amnesia Spell) You might just catch someone's attention who may actually know exactly what it is that you're searching for, but usually skips over vague titles. That, and not doing so would put your thread at risk for either being locked or deleted, since it's pretty much explained in the sticky at the top of the forum. Just a friendly heads-up.