## Migrations, and how to create them

First, make a new migration file:

- `cd ${migrations folder}`
- `knex migrate:make ${your migration name}`

Next, write your migration! Here's an example below that adds a new column to a table.

```js

/* istanbul ignore file */
exports.up = async ( knex ) => {
  await knex.schema.alterTable( 'scopes', table => {
    table.boolean( 'public' ).defaultTo( true )
  } )
}

exports.down = async ( knex ) => {
  let hasColumn = await knex.schema.hasColumn( 'scopes', 'public' )
  if ( hasColumn ) {
    await knex.schema.alterTable( 'scopes', table => {
      table.dropColumn( 'public' )
    } )
  }
}

```

Notes:
- Do not delete or edit existing migration files
- To edit an existing table, use alter table in a new migration file.
- Always prefix your migration file with the date that you authored it in.