diff --git a/crates/common/src/repo/users.rs b/crates/common/src/repo/users.rs
index 18d94ed..10b5c9b 100644
--- a/crates/common/src/repo/users.rs
+++ b/crates/common/src/repo/users.rs
@@ -453,7 +453,7 @@ pub async fn validate_session(
     .execute(pool)
     .await
     {
-      tracing::warn!("Failed to update session last_used_at: {e}");
+      tracing::warn!(token_hash = %token_hash, "Failed to update session last_used_at: {e}");
     }
   }
 
diff --git a/crates/server/src/state.rs b/crates/server/src/state.rs
index ea2836d..4b783e3 100644
--- a/crates/server/src/state.rs
+++ b/crates/server/src/state.rs
@@ -89,7 +89,7 @@ impl AppState {
         let before = sessions.len();
         sessions
           .retain(|_, session| session.created_at.elapsed() < SESSION_MAX_AGE);
-        let evicted = before - sessions.len();
+        let evicted = before.saturating_sub(sessions.len());
         if evicted > 0 {
           tracing::debug!(
             evicted = evicted,