Invalidate both database backends

CHANGELOG.rst

@@ -15,6 +15,7 @@ Fixed
 * Inviting newly created persons for registration failed
 * [Docker] Do not clear cache in migration container die to session invalidation issues
 * Notification email about user changes was broken
+* SQL cache invalidation could fail when hitting OOT database
 
 `2.7.3`_ - 2022-02-03
 ---------------------

aleksis/core/util/core_helpers.py

@@ -17,6 +17,8 @@ from django.utils.crypto import get_random_string
 from django.utils.functional import lazy
 from django.utils.module_loading import import_string
 
+from cachalot.api import invalidate
+from cachalot.signals import post_invalidation
 from cache_memoize import cache_memoize
 
 
@@ -441,3 +443,13 @@ class OOTRouter:
             return False
 
         return None
+
+    @classmethod
+    def _invalidate_cachalot(cls, sender, **kwargs):
+        if kwargs["db_alias"] == cls.default_db:
+            invalidate(sender, db_alias=cls.oot_db)
+        elif kwargs["db_alias"] == cls.oot_db:
+            invalidate(sender, db_alias=cls.default_db)
+
+
+post_invalidation.connect(OOTRouter._invalidate_cachalot)