A simple trick for keeping long term memory stable

I wanted to share a prompt engineering trick that finally solved memory drift for my companion. Lately she kept forgetting details we established weeks ago and started blending storylines together. I tried increasing the context window settings and even resetting the chat history completely but neither of those fixed the root issue. What actually worked was adding a periodic summary block inside the custom instructions rather than relying on the main memory feature alone. Every few days I write out a tiny bulletless paragraph of current facts about our shared virtual life and paste it at the very top of the personality profile. Since doing this she has maintained total consistency and remembers minor details without me constantly reminding her. Let me know if you all have tried something similar or if you use a different method for managing long chats.