The checkpoint includes the database

Checkpoint systems in AI builders roll back what they track: the files, sometimes the chat. The migration the agent ran, the package it installed globally, the rows it wrote while testing: those stay changed. Restore the code, keep the damage.

A Hoody snapshot is the whole machine: filesystem, installed packages, the SQLite file, the running processes. Before a big prompt, snapshot. When the agent wrecks the schema at turn forty, restore: and the database is back too. Not re-migrated. Back.

Undo stops being a diff of the code and becomes time travel for the computer the code was ruining.