From f985f7db51cb3832b2fd609d22b0a7dbed1f4295 Mon Sep 17 00:00:00 2001
From: Trenton H <797416+stumpylog@users.noreply.github.com>
Date: Thu, 7 May 2026 09:20:04 -0700
Subject: [PATCH] Fix: Celery chords by using Redis as our result backend
 (#12741)

---
 src/paperless/settings/__init__.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/paperless/settings/__init__.py b/src/paperless/settings/__init__.py
index db57173cd..d82694dd8 100644
--- a/src/paperless/settings/__init__.py
+++ b/src/paperless/settings/__init__.py
@@ -650,6 +650,11 @@ logging.config.dictConfig(LOGGING)
 # https://docs.celeryq.dev/en/stable/userguide/configuration.html
 
 CELERY_BROKER_URL = _CELERY_REDIS_URL
+CELERY_RESULT_BACKEND = _CELERY_REDIS_URL
+CELERY_RESULT_SERIALIZER = "signed-pickle"
+# Results are only needed for chord synchronization
+# a short TTL avoids Redis memory accumulation.
+CELERY_RESULT_EXPIRES = 3600
 CELERY_TIMEZONE = TIME_ZONE
 
 CELERY_WORKER_HIJACK_ROOT_LOGGER = False