# Database Migration

Changes to Fides could require a change to the database model. This includes scenarios where you want to persist a new field or replace an existing field. Changes made to the Fides databases are done through alembic migration scripts. Migrations can be found in the following directory: `src/fides/api/alembic/migrations/versions`

To create a new migration we use the `alembic revision` command:

```
cd src/fides/api/alembic
alembic revision --autogenerate -m "migration message"
```

The autogenerated script should be verified and could require some manual changes. Migrations will run on server startup.

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