MongoDB entity relationship model for a smart kitchen platform spanning identity, runtime sessions, logging, and analytics domains. Users authenticated via Firebase Auth connect to recipes, cooking sessions, and registered machines, with session data flowing into structured logs and analytics event stores. This five-lane architecture separates concerns between auth, core operations, observability, and user-facing planning tools like meal plans and grocery lists. Fork this diagram on Diagrams.so to adapt the schema for your own connected appliance or recipe management system.