What is knowledge base maintenance?

Example: A product manager builds a personal knowledge graph over six months — 400 nodes covering product strategy, user research, competitor analysis, and engineering trade-offs. She never reviews it. By month nine, a third of the links point to obsolete frameworks her team abandoned, two key concept nodes duplicate each other with slightly different names, and the entire 'market research' cluster is disconnected from 'product decisions' because she never created the edges between insights and the strategies they informed. The graph still looks impressive. It no longer tells the truth.

This concept is part of Knowledge Graphs in the How to Think curriculum.