diff --git a/backend/composer.json b/backend/composer.json
index 4520014..6ade632 100644
--- a/backend/composer.json
+++ b/backend/composer.json
@@ -12,6 +12,7 @@
         "doctrine/doctrine-bundle": "^2.18",
         "doctrine/doctrine-migrations-bundle": "^3.7",
         "doctrine/orm": "^3.6",
+        "dragonmantank/cron-expression": "*",
         "jsor/doctrine-postgis": "^2.4",
         "minishlink/web-push": "^10.0",
         "nelmio/cors-bundle": "^2.6",
diff --git a/backend/composer.lock b/backend/composer.lock
index 4df776f..6acde24 100644
--- a/backend/composer.lock
+++ b/backend/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "391624b5a53f48007cffbbbb82d7b6e8",
+    "content-hash": "f84014f96513bc79a200c1750efd1dd5",
     "packages": [
         {
             "name": "api-platform/doctrine-common",
@@ -2501,6 +2501,70 @@
             },
             "time": "2026-02-08T16:21:46+00:00"
         },
+        {
+            "name": "dragonmantank/cron-expression",
+            "version": "v3.6.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/dragonmantank/cron-expression.git",
+                "reference": "d61a8a9604ec1f8c3d150d09db6ce98b32675013"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/dragonmantank/cron-expression/zipball/d61a8a9604ec1f8c3d150d09db6ce98b32675013",
+                "reference": "d61a8a9604ec1f8c3d150d09db6ce98b32675013",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^8.2|^8.3|^8.4|^8.5"
+            },
+            "replace": {
+                "mtdowling/cron-expression": "^1.0"
+            },
+            "require-dev": {
+                "phpstan/extension-installer": "^1.4.3",
+                "phpstan/phpstan": "^1.12.32|^2.1.31",
+                "phpunit/phpunit": "^8.5.48|^9.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Cron\\": "src/Cron/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Chris Tankersley",
+                    "email": "chris@ctankersley.com",
+                    "homepage": "https://github.com/dragonmantank"
+                }
+            ],
+            "description": "CRON for PHP: Calculate the next or previous run date and determine if a CRON expression is due",
+            "keywords": [
+                "cron",
+                "schedule"
+            ],
+            "support": {
+                "issues": "https://github.com/dragonmantank/cron-expression/issues",
+                "source": "https://github.com/dragonmantank/cron-expression/tree/v3.6.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/dragonmantank",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-10-31T18:51:33+00:00"
+        },
         {
             "name": "guzzlehttp/guzzle",
             "version": "7.10.0",