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Reverts applied migrations in the given repository.

Migrations are expected to be found inside the migrations
directory returned by the priv function defined in the

Runs the latest applied migration by default. To roll back to
to a version number, supply `--to version_number`.
To roll back a specific number of times, use `--step n`.
To undo all applied migrations, provide `--all`.

## Command line options

* `--all` - revert all applied migrations
* `--step` / `-n` - rever n number of applied migrations
* `--to` / `-v` - revert all migrations down to and including version
* `--no-start` - do not start applications

## Examples

    mix ecto.rollback MyApp.Repo

    mix ecto.rollback MyApp.Repo -n 3
    mix ecto.rollback MyApp.Repo --step 3

    mix ecto.rollback MyApp.Repo -v 20080906120000
    mix ecto.rollback MyApp.Repo --to 20080906120000
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