feat(backend): implement postgres job queue

backend/jobs/management/commands/run_job_workers.py

@@ -0,0 +1,21 @@
+import logging
+import signal
+
+from django.core.management.base import BaseCommand
+
+from jobs.worker import JobWorkerRunner
+
+logger = logging.getLogger(__name__)
+
+
+class Command(BaseCommand):
+    help = "Run the configured threaded job worker."
+
+    def handle(self, *args, **options):
+        logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s %(message)s")
+        runner = JobWorkerRunner()
+        signal.signal(signal.SIGINT, runner.request_stop)
+        signal.signal(signal.SIGTERM, runner.request_stop)
+        self.stdout.write(self.style.SUCCESS(f"Starting {runner.thread_count} job worker thread(s)."))
+        runner.run_forever()
+        self.stdout.write(self.style.SUCCESS("Job worker stopped."))