Fix migrations

Signed-off-by: Aniket Pant <me@aniketpant.com>
Fix seeding

Signed-off-by: Aniket Pant <me@aniketpant.com>
Fix model to allow timestamps

Signed-off-by: Aniket Pant <me@aniketpant.com>
Add Role model for complying with the seeding

Signed-off-by: Aniket Pant <me@aniketpant.com>