MySQL? Postgres would also work. Redis might work but would make things like reporting/aggregating and other work more difficult. MySQL/MariaDB/Postgres all support `SELECT ... FOR UPDATE SKIP LOCKED`, allow aggregation (`SELECT AVG(completed_time-pending_time)`), etc.
+MySQL: support in 8.0.1 (2017-04-10, Fedora 40+)
+MariaDB: support in 10.6 (2021-07, Ubuntu 22.04+, Debian bookworm+)
+
## Insertion
Jobs are typically inserted into the database by a front-end like dlqueue.php (optionally via bookmarklet) or dlqueue.sh