Fix migrations

[zavan]

3 changes:

1. Changed ids and foreign key columns to use bigint instead of int. Rodauth (and ActiveRecord) now uses bigint columns for the ids, so using int for the foreign keys doesn't work.

2. Added missing index keys for some unique fields to fix ArgumentError: Unknown key: :unique. error.

3. ActiveRecord now uses precision 6 for datetime fields by default, so the default values must also specify that. See this.

[zavan]

Another one:

Trilogy::ProtocolError: 1072: Key column 'code' doesn't exist in table /app/db/migrate/20230327145623_create_rodauth_oauth.rb:101:in change'`

    create_table :oauth_pushed_requests do |t|
      t.bigint :oauth_application_id
      t.foreign_key :oauth_applications, column: :oauth_application_id
      t.string :params, null: false
      t.datetime :expires_in, null: false
      t.index %i[oauth_application_id ->>>>code<<<<-], unique: true
    end

That column doesn't exist on the table, not sure what to do about this one.

[zavan]

Closing because I just noticed PRs are supposed to go on GitLab.

https://gitlab.com/os85/rodauth-oauth/-/merge_requests/117