Add indexes to available_at and max_visits

[cesargb]

Add indexes to available_at and max_visits

Reason

The self-cleaning process of the magiclink logs causes latency when the logs do not expire.

see: #120

Caution

Stack migration adding indexes may take 2 or more seconds for a volume of 400,000 records.

Install

composer update cesargb/laravel-magiclink
php artisan vendor:publish --provider="MagicLink\MagicLinkServiceProvider" --tag="migrations"
php artisan migrate