[celery] Queue-based task prioritization (672c81bf)

CHANGELOG.org

@@ -117,6 +117,34 @@ Import gym sessions and routines from a Flexify backup.
   cover body-composition metrics on Task scrobbles and `bodyweight_kg` on
   Workout scrobbles.
 
+** DONE [#A] Fix celery task prioritization especially for agent sessions :celery:tasks:agents:
+:PROPERTIES:
+:ID:       672c81bf-bba9-a963-e8ac-52246d976cea
+:END:
+
+Split Celery work into four queues so time-sensitive tasks run promptly even
+when long batch jobs are queued:
+
+- `priority` — interactive/user-facing tasks (agent session prompts, Mopidy
+  queue/playlist adds, favorite toggles, reverse geocoding) get a dedicated
+  high-concurrency worker (`--concurrency=4 --prefetch-multiplier=1`).
+- `charts` — per-scrobble chart updates (`update_charts_for_timestamp`) stay on
+  their own queue, no longer blocked behind scheduled chart rebuilds (those
+  moved to `background`).
+- `background` — heavy/scheduled jobs (db backup, trend computation, sentiment
+  backfill, chart rebuilds, twitch VOD check, historical Last.fm dispatch) run
+  on a dedicated low-concurrency worker (`--concurrency=1`).
+- `default` — everything else (imports, notifications, archivebox pushes,
+  board-game expansion fetches). `CELERY_TASK_DEFAULT_QUEUE` is now set
+  explicitly to `default`; previously un-routed tasks were published to
+  Celery's default `celery` queue, which no worker consumed.
+
+Workers run as three FreeBSD daemons (`vrobbler_celery` on `default,charts`,
+plus new `vrobbler_celery_priority` and `vrobbler_celery_background` rc.d
+scripts with distinct nodenames). Procfile, justfile, Makefile, Drone and
+Gitea workflows updated accordingly.
+
+
 * Version 64.5 [1/1]
 ** DONE [#B] Clean up issues with org-mode notes :orgmode:notes:scrobbles:
 :PROPERTIES: