SQL Murder Mystery by Joon Park and Cathy He, produced by Joe Germuska / Northwestern Knight Lab.
Source https://github.com/NUKnightLab/sql-mysteries
Original code MIT (LICENSE.txt). Original text and dataset CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/
SQL.js by Alon Zakai and contributors (MIT). SQLite is public domain.
SkillSafe adaptation: standalone responsive interface, bundled worker and data, query history, local notebook, error recovery. No external assets or tracking.