PGSimCity presents a working model of the PostgreSQL engine that loads city code to simulate urban management. The project is an early, unreviewed prototype and the author notes that it likely contains inaccuracies in both the model and its explanations. Hosted at nikolays.github.io/PGSimCity/, the model allows users to interact with simulated city data while the underlying PostgreSQL engine processes the information. Users who identify errors can open an issue or submit a pull request to improve the prototype.