perf(*): bound list queries, batch fetches, harden media downloads

backend/src/userbot/modules/jobs/consumer.py

@@ -69,6 +69,9 @@ class JobConsumer:
         requeued = await repository.requeue_running(self.pool, self.account_id)
         if requeued:
             logger.info(f"[yellow]Requeued {requeued} stale running job(s).[/]")
+        pruned = await repository.prune_finished(self.pool, self.account_id)
+        if pruned:
+            logger.info(f"[yellow]Pruned {pruned} finished job(s).[/]")
         conn = await asyncpg.connect(dsn=env.db.connection_url)
         await conn.add_listener(JOBS_CHANGED_CHANNEL, lambda *_: self._wake.set())
         logger.info(f"[green]Job consumer running for account {self.account_id}.[/]")