tl;dr: Since 2022, macOS ships two undocumented daemons (knowledgeconstructiond and intelligenceplatformd) that build a local SQLite knowledge graph of the user's life, cross-referencing Contacts, Photos, Calendar, Messages, Mail, location, and Screen Time into 181 entity classes and 278 predicates. It goes beyond copying data: shipped XGBoost classifiers score who counts as "family" using 144 features—including things like "photosPersonPosteriorProbabilityGivenSaturdayNight"—and an on-device LLM infers names and relationships for faces. Deleted entries persist in an expired_stable_graph table, and the author released an open-source dashboard (iKnow) to inspect it.