Invoice Ninja relies on Laravel's scheduler for recurring invoices,
scheduled reports, and other internal cron-driven jobs. Without a
systemd unit invoking `artisan schedule:run` periodically, the app's
dashboard reports "cron jobs are not enabled" after login.
Adds invoiceninja-scheduler.timer (every minute, matching upstream's
documented cron cadence) and its oneshot service, and extends the
automated test to assert the timer is active and schedule:run succeeds.
Note: the app's own is_scheduler_running flag only flips on a 5-minute
wall-clock boundary (app/Console/Kernel.php's everyFiveMinutes() job),
so the dashboard warning can take a few minutes to clear after boot -
confirmed working via the "Refresh Data" button in that same modal.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
awkawbandClaude Sonnet 5
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