From 296a4b92d6ec73bbfc413b0a6f94fd918977869c Mon Sep 17 00:00:00 2001
From: April Grimoire <april@aprilg.moe>
Date: Fri, 6 Feb 2026 14:43:02 +0800
Subject: [PATCH] fix: Resolve unnecessary serialization issue

Fixes #1335
---
 changelog.d/1340.bugfix  | 1 +
 src/service/users/mod.rs | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)
 create mode 100644 changelog.d/1340.bugfix

diff --git a/changelog.d/1340.bugfix b/changelog.d/1340.bugfix
new file mode 100644
index 00000000..60e415fd
--- /dev/null
+++ b/changelog.d/1340.bugfix
@@ -0,0 +1 @@
+Use exists instead of contains to save writing to a buffer in src/service/users/mod.rs: is_login_disabled. Contributed by @aprilgrimoire.
diff --git a/src/service/users/mod.rs b/src/service/users/mod.rs
index c79e4f72..8599cd68 100644
--- a/src/service/users/mod.rs
+++ b/src/service/users/mod.rs
@@ -304,7 +304,11 @@ impl Service {
 	pub fn enable_login(&self, user_id: &UserId) { self.db.userid_logindisabled.remove(user_id); }
 
 	pub async fn is_login_disabled(&self, user_id: &UserId) -> bool {
-		self.db.userid_logindisabled.contains(user_id).await
+		self.db
+			.userid_logindisabled
+			.exists(user_id.as_str())
+			.await
+			.is_ok()
 	}
 
 	/// Check if account is active, infallible