From e32ab8aef278ebcef7ecbc9ae67f417b6862cff9 Mon Sep 17 00:00:00 2001
From: Phantasm <phantasm@centrum.cz>
Date: Tue, 14 Oct 2025 22:59:15 +0200
Subject: [PATCH] DB prune: Check if user follows hashtag with no objects
 before deletion

---
 changelog.d/prune-hashtag-follow-3376.fix | 1 +
 lib/mix/tasks/pleroma/database.ex         | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 changelog.d/prune-hashtag-follow-3376.fix

diff --git a/changelog.d/prune-hashtag-follow-3376.fix b/changelog.d/prune-hashtag-follow-3376.fix
new file mode 100644
index 000000000..cdb4e9a79
--- /dev/null
+++ b/changelog.d/prune-hashtag-follow-3376.fix
@@ -0,0 +1 @@
+DB prune: Check if user follows hashtag with no objects before deletion
diff --git a/lib/mix/tasks/pleroma/database.ex b/lib/mix/tasks/pleroma/database.ex
index e52b5e0a7..396536827 100644
--- a/lib/mix/tasks/pleroma/database.ex
+++ b/lib/mix/tasks/pleroma/database.ex
@@ -226,7 +226,12 @@ defmodule Mix.Tasks.Pleroma.Database do
     DELETE FROM hashtags AS ht
     WHERE NOT EXISTS (
       SELECT 1 FROM hashtags_objects hto
-      WHERE ht.id = hto.hashtag_id)
+      WHERE ht.id = hto.hashtag_id
+    )
+    AND NOT EXISTS (
+      SELECT 1 FROM user_follows_hashtag ufh
+      WHERE ht.id = ufh.hashtag_id
+    )
     """
     |> Repo.query()