Laravel Horizon jobs are vanishing

My jobs will all queue correctly and start processing, but when I check them after some time, the Pending and Completed jobs have vanished. I thought this was an issue with the cache redis stores conflicting and getting cleared, but I have those configured correctly as far as I can tell.

I have a pro version of Herd 1.9.1 (latest) running with PHP 8.2.22. My app is on Laravel v10.48.20 with Horizon v5.27.1.

I have a separate redis database setup in config/database.php

return [
//...
        'cache' => [
            'url' => env('REDIS_URL'),
            'host' => env('REDIS_HOST', '127.0.0.1'),
            'username' => env('REDIS_USERNAME'),
            'password' => env('REDIS_PASSWORD'),
            'port' => env('REDIS_PORT', '6379'),
            'database' => env('REDIS_CACHE_DB', '1'),
        ],

        'jobs' => [
            'url' => env('REDIS_URL'),
            'host' => env('REDIS_HOST', '127.0.0.1'),
            'username' => env('REDIS_USERNAME'),
            'password' => env('REDIS_PASSWORD'),
            'port' => env('REDIS_PORT', '6379'),
            'database' => 'jobs_' . env('REDIS_DB', '1'),
        ],
//...
];

I have config/horizon.php set to use the jobs connection.

return [
//...


    /*
    |--------------------------------------------------------------------------
    | Horizon Redis Connection
    |--------------------------------------------------------------------------
    |
    | This is the name of the Redis connection where Horizon will store the
    | meta information required for it to function. It includes the list
    | of supervisors, failed jobs, job metrics, and other information.
    |
    */

    'use' => 'jobs',
//...
];

And I have these set in my .env (which initially I thought solved the issue - not having a REDIS_DB defined).

CACHE_DRIVER=redis
QUEUE_CONNECTION=redis
REDIS_DB=myappname
REDIS_CACHE_DB=myappname_cache
REDIS_QUEUE=default

I've been going on circles with this for hours, so any help is appreciated!