Migration

A file that changes the structure of the database, for example adds a column. Once applied, it isn’t modified anymore.

You’ll also find it as: migrations

How it appears in the course

Never — the prohibitions. Migrations that have already been published are not modified. The .env file (which holds passwords) is never saved in git.

A ready-made example · Module 02, CLAUDE.md: your project’s memory

for p in ... goes one by one through the protected list: .env (where the passwords are), package-lock.json, the .git/ folder (the project’s history), the migrations/ folder (changes to the database).

Ready-to-use recipes · Module 07, Hooks: automatic actions

Learn Claude Code from zero, in plain English

12 modules with 1–2 minute lessons, which you can also do on your phone. The first two modules are free.

Start with the first lesson All terms